elements 201206

8
Cockenzie & Port Seton Amateur Radio Club Elements Cockenzie & Port Seton Amateur Radio Club is affiliated to the Radio Society of Great Britain and holds the call signs MM0CPS and GM2T which are used for our special event and contest entries. The Club was formed by Bob Glasgow GM4UYZ in 1984 to help the local amateurs get to know each other. Far from being just a local club we have members regularly aending from the Borders, Dumfries, Strathclyde, Fife and Newcastle. The Club meets on the first Friday of every month (Second Friday of January) in the lounge of the Thorntree Inn on the old Cockenzie High Street from 7pm ll late. Editorial This month I am wring the editorial and my newsleer input early and this is due to other commitments. It is hard to believe that soon we will be moving into the major holiday period, isn’t me flying by. Moving on to what has happened over the past month. On the club front we had our first DF night and although the weather was not great we all sll had loads of fun. A full report is further in the newsleer. Thanks to Ron GM0NTL for pung up the Hybszer Trophy in memory of Bill GM8ZLI/MM0BXK for this event which was won by Paul MM0VPR and Robin MM0VTV. To the future this month, there is one important change and that is the July Club Night will be one week early and will take place on Friday 29 th June. The reason for the change is that our normal first Friday of the month is clashing with VHF Field Day where many of the club members will be away to. So what else is happening well our first “Demonstraon Staon” is pung on a radio staon at the Port Seton Gala Day. It is early this year and the reason for that is the whole event is based on when there is a high de due to the Sea Going Bale that takes place. We are now starng to enter the main contest season for the club of which we will be entering a few. They are the 6M Trophy, PW QRP. This month we also have on the 16 th & 17 th the “Museums on the Air” weekend again from the Museum of Flight, East Fortune. We will be operang from our normal hanger up beside the Vulcan bomber. These demonstraon staons offer everyone to have a real go at HF operang using a tremendous HF set up so I hope you will take the opportunity to come along and give it a try. Last but not least is our own 20M Acvity Night on the 20 th June. It is an Acvity night in the hope that many will take part. It is all for a bit of fun and an opportunity to see what can be worked. It is not a serious event but just an excuse to go out for a few hours on a Wednesday evening to “play at HF Radio”. If you can’t get out then why not go on the air from home as a single operator and see what you can work. So please do not dismiss the idea about not doing it, go on and try and parcipate. I am interested in what people do work so any chance you could send me your logs and I will try and do a small write up on what was achieved. So can I please have a copy of your log by the 6 th July at the latest? If you are interested in the 6M trophy contact John MM0CCC [email protected] who is organising that and for the PW QRP contest contact Robin MM0VTV [email protected] .. A busy month then all rounds so I hope you can take part in all the events. Those who have obtained their Foundaon Licence in the last year and have even progressed on to their Full licence are eligible at the following events – Port Seton Gala Day, Museum of Flight and 20M Acvity Night to go towards winning the Vic Trophy. The only constraint is that they must have obtained one of their licences via the CPSARC training program in the last year. If you take part in the 20M Acvity Night then a copy of your log is mandatory. (Connued on page 2) In this issue Left Handed Capacitor Trophy P.2 Morse Class Thoughts P.3 CPSARC HF Activity Night P.3 Morse Training P.4 DF Night P.5 Clublog Tables P.6 VHF Field Day P.6 Test Your Knowledge P.7 Event Calendar P.8 Volume 20 June 2012 06

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Elements 201206

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Page 1: Elements 201206

Cockenzie

& Port Seton Amateur Radio Club Elements

Cockenzie & Port Seton

Amateur Radio Club is

affiliated to the Radio

Society of Great Britain

and holds the call signs

MM0CPS and GM2T which

are used for our special

event and contest entries.

The Club was formed by

Bob Glasgow GM4UYZ in

1984 to help the local

amateurs get to know each

other.

Far from being just a local

club we have members

regularly attending from

the Borders, Dumfries,

Strathclyde, Fife and

Newcastle.

The Club meets on the first

Friday of every month

(Second Friday of January)

in the lounge of the

Thorntree Inn on the old

Cockenzie High Street from

7pm till late.

Editorial This month I am writing the editorial and my newsletter input early and this is due to other commitments. It is hard to believe that soon we will be moving into the major holiday period, isn’t time flying by.

Moving on to what has happened over the past month. On the club front we had our first DF night and although the weather was not great we all still had loads of fun. A full report is further in the newsletter. Thanks to Ron GM0NTL for putting up the Hybszer Trophy in memory of Bill GM8ZLI/MM0BXK for this event which was won by Paul MM0VPR and Robin MM0VTV.

To the future this month, there is one important change and that is the July Club Night will be one week early and will take place on Friday 29th June. The reason for the change is that our normal first Friday of the month is clashing with VHF Field Day where many of the club members will be away to. So what else is happening well our first “Demonstration Station” is putting on a radio station at the Port Seton Gala Day. It is early this year and the reason for that is the whole event is based on when there is a high tide due to the Sea Going Battle that takes place. We are now starting to enter the main contest season for the club of which we will be entering a few. They are the 6M Trophy, PW QRP. This month we also have on the 16th & 17th the “Museums on the Air” weekend again from the Museum of Flight, East Fortune. We will be operating from our normal hanger up beside the Vulcan bomber. These demonstration stations offer everyone to have a real go at HF operating using a tremendous HF set up so I hope you

will take the opportunity to come along and give it a try. Last but not least is our own 20M Activity Night on the 20th June. It is an Activity night in the hope that many will take part. It is all for a bit of fun and an opportunity to see what can be worked. It is not a serious event but just an excuse to go out for a few hours on a Wednesday evening to “play at HF Radio”. If you can’t get out then why not go on the air from home as a single operator and see what you can work. So please do not dismiss the idea about not doing it, go on and try and participate. I am interested in what people do work so any chance you could send me your logs and I will try and do a small write up on what was achieved. So can I please have a copy of your log by the 6th July at the latest?

If you are interested in the 6M trophy contact John MM0CCC [email protected] who is organising that and for the PW QRP contest contact Robin MM0VTV [email protected] .. A busy month then all rounds so I hope you can take part in all the events.

Those who have obtained their Foundation Licence in the last year and have even progressed on to their Full licence are eligible at the following events – Port Seton Gala Day, Museum of Flight and 20M Activity Night to go towards winning the Vic Trophy. The only constraint is that they must have obtained one of their licences via the CPSARC training program in the last year. If you take part in the 20M Activity Night then a copy of your log is mandatory.

(Continued on page 2)

In this issue Left Handed Capacitor Trophy P.2

Morse Class Thoughts P.3

CPSARC HF Activity Night P.3

Morse Training P.4

DF Night P.5

Clublog Tables P.6

VHF Field Day P.6

Test Your Knowledge P.7

Event Calendar P.8

V o l u m e 2 0

Ju n e

2 0 12

06

Page 2: Elements 201206

2

This month certainly has a lot of operating activities so there is something there for everyone. Some of the events will certainly give you an opportunity to practice some of the skills required to go contesting so why not take time out and give it a try. Events like Museums on the Air although are demonstration set-ups can at the same time be extremely hectic. What they offer is the ability to use some of logging programs and learn all about them, and also how to handle a pile up like we have experienced over the last few events we

have run at the Museum of Flight. It is better to play at these events rather than try and learn when you are involved in a major contest. The opportunity is there so why not use it.

That’s it then for me this month, I hope you will take part in all of the events; it would be tremendous to see. Enjoy the newsletter.

Bob GM4UYZ

Back in 2009, we ran a challenge as part of our 25 Years Club Anniversary. As part of this challenge, a trophy, "Left Handed Capacitor Trophy" in memory of Vic GM4GGF was awarded to the winner of the Foundation Licence holder with the "most Distant QSO". Martyn MM0XXW, then MM3XXW won this. Another challenge where the trophy could be once more pre-sented, but this time on an annual basis was created in 2011. The idea that came up trumps, (thanks Cambell MM0DXC), is to present it to the person who has been licensed for up to one year, and makes the greatest number of QSO’s during our Special Event Stations. The aim is to encourage newer opera-tors to “operate” and help overcome any microphone hesitan-cy. Criteria:

Those taking part must have obtained their Foundation Licence within the previous year, even though at the time of taking part may have obtained their Intermediate or even Advanced Licence.

The year will run from the 1st May through to the 30th April. This covers the club’s September to April training program

Entrants must be able to identify that they obtained their Foundation Licence at some time during the stipulated year dates.

Entrants need not have been trained by the Club for all of the three licences but must have at least obtained one of them via the Club’s training program.

Entrants must operate at the Special Events run by the club over the specific year period. Normal events that the club participates in each year are the Port Seton Gala Day (MM0CPS), Museum of Flight (GB2MOF), Lighthouse Weekend (GB2LBN) and also the Club’s Activity Night. There may be others depending on requests and these will also be included.

Win-Test Logging software will be used to create our log of an event.

Each operator before starting to operate will use the OPON com-mand and enter his call sign.

Each operator on completing their operating period will use the OPOFF command.

All contacts made during that period by the operator will now be logged.

After an event the log will be checked and the number of QSO’s made by each operator will be counted and record-ed.

After the completion of the year period each operator’s totals for each event will be totalled and the operator with the most QSO’s will be deemed the winner.

The trophy will then be presented to the winner who can retain it for a year before returning it to the club.

YEAR ONE – 2011 2011 was the first year that the above was used to encour-age “new blood” into taking part in the Special Events run in the Club’s Event’s Program. There were a possible 17 people who were eligible to take part but only 3 did. The winner of the Trophy is Paul Rice MM0VPR/2M0CEX/MM6ANB who made a total of 598 QSO’s during the year. Congratulations Paul on winning the trophy for the year, you have now set the standard. YEAR TWO – 2012 This year there are 10 people eligible and they have all been notified by email so hopefully they will step up for the challenge. Good luck to you all... Bob GM4UYZ

The Left Handed Capacitor Trophy

Page 3: Elements 201206

Morse Class thoughts

MORSE CLASS (November to May) – My thoughts... Having been licensed for thirty years or more and having always had trouble with Morse, the Club's Morse class which started last November and finished last Monday has been an utter godsend. Learning in a relaxed atmosphere and learning at an easy pace has been the answer. Being in a group of like minded folk, all with differing skills at the outset has been a good. There was always plenty of help and encouragement available.

Special thanks to Bob GM4UYZ and Campbell MM0DXC for putting the course together, for their instruction, help and patience throughout. Thanks too, to the other members on the course... If you have always wanted to get involved with Morse, but have never found a way, can I suggest you enrol for the next set of classes? I can highly recommend them to you, and it’s also not a bad way of spending a couple of hours each week with friends during the dark winter nights. Dudley GM8PAH

2

Our club has been added

to the excellent Clublog

system developed by

Michael Wells G7VJR.

www.clublog.org

The system allows

members to upload their

logs in ADIF format and

have them displayed in a

table with all the other

club members.

Clublog also has great

facilities for tracking your

DXCC status etc so is well

worth taking the time to

register and get your log

uploaded.

To update your log with

the next set of contacts

(SSB, CW or Data) you can

simply upload your whole

log again and the system

will take care of the

duplicates. Alternatively

you can export the bits

you want from your own

log and just upload that.

The tables we’ll publish

here will be the club,

filtered by the current

year, so everyone starts a

new year at 0 contacts.

For a few years we tried running our own “small” contest on the nearest Wednesday to mid-summers day. We started at first using 10M but as the sunspot cycle started to fall it was moved to the current 20M band. Over the years it was not really well supported. Many of the comments that came back after the event are, “it is a “Contest” why not make it an Activity Night”. To that end it changed to just that an Activity Night.

The aim of the event is to get on the air and work as many stations that you can in the allotted time period plus at the same time have some fun. We are Radio Amateurs after all and we are supposed

to get on the air and make contacts so come on then let me see you doing it.

After the event can you send me a copy of your log so that I can write up some report on what you all managed to achieve plus why not update the club tables and show everyone else what you achieved.

Look forward to a massive turnout for the event…

Bob GM4UYZ

(1) Date 20th June 2012

(2) Time 19:00 to 22:00 Local Time

(3) Modes SSB / CW/ Data

(4) Power As per your licence Full=400W, Intermediate=50W and Founda-tion=10W

(5) Eligible Entrants Open to any one who wishes to take part

(6) Exchange Report (RST)

(7) Closing Date Closing Date for the Logs is Friday, 6th July 2012

(8) Return Logs to Bob Glasgow GM4UYZ, 7 Castle Terrace, Port Seton, Preston-pans,

East Lothian, EH32 0EE

Email [email protected]

CPSARC 20m Activity Night

Page 4: Elements 201206

Club Attire

The club has a design for

Club Tee-shirts, Polo-

shirts, Sweat-Shirts, Fleec-

es and Jackets and all of

these can be obtained

from the address below.

When making an order

please quote ‘Cockenzie &

Port Seton Amateur Radio

Club’ as this will ensure

that the Club Logo will be

placed on the required

ordered garments.

If you wish to add your call

-sign to the logo then

please ask at the time of

the order.

Cost will depend on gar-

ment and should cover the

garment and logo, call-sign

addition will be extra.

Order from:

PATRICIA BEWSEY DESIGNS,

UNIT 11,

FENTON BARNS RETAIL

VILLAGE,

FENTON BARNS,

NORTH BERWICK,

EAST LOTHIAN

EH39 5BW

Tel/Fax: 01620 850788

Mobile: 07970 920431

4

November 2011 to May 2012 Our first real class for teaching Morse Code (CW) on a regular basis has now successfully came to a conclusion on Monday 14th May 2012. It started back on the 14th November 2011with a real big enthusiastic group but sadly dwindled away very quickly to an aver-age of 6 people a night depending on peoples work, holidays, etc. The training was held each Monday night between 19:00 and 21:00 in the Port Seton Resource Centre and did run for 24 weeks. The training consisted of a total of 17 weeks where the Morse Code characters were learnt using a computer running the NU-MORSE Professional Morse training program and the KOCH method of learning. From day one the character speed was set at 20WPM and the spacing adjusted to give an overall speed of 6WPM. The reason for the fast char-acter speed is to get everyone used to hear-ing the characters at the fast speed i.e. learn-ing the sound so as the when the spacing is adjusted to increase the overall speed the characters are still coming at 20WPM. For the next 5 weeks using the same software pro-gram the format changed to receiving QSO’s and then finally for the last two weeks each person started sending CW using Paddles. The choice of using a standard Mores Key or paddles was left down to the individuals but everyone opted for the paddles. I must admit I personally would not go back to using the standard Morse Key as using paddles is a far more relaxed method of sending CW. This area is another skill that everyone needs to learn and I must admit everyone has taken to it like “a duck to water”. Yes still plenty of mistakes but that will disappear with prac-tice. Was it a successful training exercise, in my opinion yes? Those who did “stay to the end” know the code, can send characters using a set of paddles and were well on the way to achieving a greater speed in CW. It is some-thing that they must keep on top off though otherwise they will soon lose the skills they have just learnt and I personally think they are enthusiastic enough to do so. I must offer thanks to Cambell MM0DXC who

stood in for me to do the training whilst I was away with my work. It was something that I was very conscious before I started that ses-sions would be missed due to my work com-mitments but thanks to Cambell it never hap-pened. Many thanks to all you who did attend and a special well done to all of you who stayed until the bitter end I hope you enjoyed it so now go out and enjoy the great mode of CW. THE FUTURE If there is enough of a response then I plan to run another Morse Training Course starting probably at the beginning of October and running it throughout the winter months. The only thing I will say is that the hire of the room needs to be paid for and at present it costs £13 per night so in reality we need 7 people to cover the cost assuming we keep it to the £2 per person per night, teacher in-cluded!!! The minimum class size in reality is 4 people and instructor (5 in total) and if that was the case then costs would have to be £3 per person to cover but would that be ac-ceptable? Hopefully it will be lots more of you!!!!!! Questions?

Are you interested in attending the next Morse Training Class starting in October?

If due to numbers would you pay the £3 a night to cover the room hire?

Is a Monday night still acceptable (Tuesday’s & Friday’s are not ok for me)?

Can you please let me know ASAP so I can set out some dates and get a room booked to accommodate the training? Happy CW’ing then... Bob GM4UYZ

Morse Training

Page 5: Elements 201206

4

May DF Night

Friday 11thMay

This year for the very first time since our DF Nights started we were not fortunate with the weather as rained. I had through-out the day been keeping an eye on the MET Office rainfall radar pictures and could see a steady flow of rain moving south all day. It looked like it would be clear by the time the DF started but alas it wasn’t. To rub it in once we finished at 20:45 the rain stopped and the sun came out. Did it deter us well the answer was no and to be honest it wasn’t as bad as it looked. So were there any disasters or stories to tell…read on.

As normal everyone who took part assembled in the Ship Inn car park ready to go at the 19:00 start. This time there were 4 cars that set out so the teams consisted off: Liz 2M1GLD & Ricky GM1PLY, Paul MM0VPR & Robin MM0VTV, Cephas MM0INS & Colwyn MM0YCJ and Robbie MM3RBC and me giving us a small turnout, could have done with more cars to increase the fun so maybe in September. . The fox this time was Bob GM4IKT.

What was at stake this year, well it was to win the “HYBSZER TROPHY” which has been donated by Ron GM0NTL in memory of the late Bill Gordon MM0BXK/GM8ZLI who died in January 2010. It is an amazing gesture in memory of a great man sadly missed by us all. Why donate the trophy at this event, well it was the one event in our Club’s Calendar that Bill loved so therefore a worthy cause.

The seven o’clock start came and off we all went. My team we headed up to the A1 Gladsmuir lay-by, which lies just to the west of Gladsmuir to be joined by Cephas & Colwyn and Paul & Robin. On the way up to this first safe stopping point we heard a transmission from the “fox” so at least we thought we should get a good bearing at the lay-by but for some reason nothing was heard so we headed up to the Garlton Monu-ment. Here we got an extremely strong signal pointing in the Fenton Barns/Dirleton direction. To get a cross bearing we headed for Spittal which lies to the east of Longniddry where we got quite a weak signal but at least gave us a bearing to-wards the Fenton Barns area. Decision was to head there but whilst on route decided to have a look at possible hiding areas but no success. Headed into Fenton Barns but got some con-flicting signals until we moved east towards North Berwick where we go a huge signal pointing towards Dirleton. Of we went again into Dirleton and again like at Fenton Barns some real conflicting signals. Decision let us go to the east of Dir-leton where we got a real, real massive signal. Using the atten-uator I managed to detect the signal was coming from the Yel-lowcraig’s area. Headed down to Yellowcraig’s with the in-structions keep your eyes peeled and look into all the nooks and crannies. We noticed a very small opening on the right hand side as we approached the main car park and low and behold there was the fox. Yes for the team........ Our time was fox found at 20:13

How did the rest fare... Paul & Robin found the Fox at 19:56;

we were next at 20:13 and Cephas & Colwyn at 20:26. Unfor-tunately Liz and Ricky didn’t find the fox.

Do we have a story this year; well the answer this year is no...

The DF finished and we headed off back to the Thorntree for the normal DF Night debrief. The “HYBSZER TROPHY” was pre-sented to Paul MM0VPR & Robin MM0VTV for winning the May DF Night which they will keep for the next six months and return for the September DF Night.

Well done Bob you certainly made it a very entertaining even-ing so on behalf of us all a massive thank you.….

Now who said DF’ing was easy, but once again it proved that it isn’t particularly when you only get a transmission for less than a minute, every 5 minutes. Everyone certainly enjoyed the evening and wants more, well they will have to wait till September when the next one takes place, and in the dark as well. Yes another test!

Roll on September!!!!!!!!

Bob GM4UYZ

Page 6: Elements 201206

The Club

The Club is run in a very

informal way, just a group

of like minded people

doing something they

enjoy!

This does not mean that

we don’t do anything, we

enter (and win!) contests,

train newcomers, hold

talks and video nights and

run a popular annual Junk

Sale. Our newsletter has

won the Practical Wireless

‘Spotlight’ competition on

several occasions.

The Club supports the

British Heart Foundation

in memory of a member

who died from heart dis-

ease by donating the

profits from some of the

events we hold, we have

raised over £14,795 since

1994.

Supported by BT Community

Champions

Club Night for July has been moved forward by one week to Friday 29h June. The reason being is that one of the club’s major contest activities takes part on the first weekend end of July and that is VHF Field Day. Quite a number of the club members will be attend-ing this event and will be travelling then starting to establish the contest station on the Friday that would normally be club night.

Many years ago we used to use a site which was local and we would then go to the site

early on the Saturday morning we have lost use of this old site and secondly we have moved to a better site located down near Castle Douglas, Dumfries which means that we have to travel a day earlier. If you wish to join us for VHF Field Day, and all are wel-come, then get in touch with John MM0CCC [email protected]

See you all a week earlier on the 29th June……

6

Clublog DXCC Tables

This is the new Clublog table for 2012, as you

can see, only a few members have uploaded

any of their QSOs for the new year.

To make the table really interesting it needs

as many members as possible to keep upload-

ing their logs, CW, SSB or DATA

You can see that there is a rising amount of

activity on the higher bands so if you’re think-

ing about getting active on 10m or 15m then

now would be a really good idea!

Change of July Club Night

7/8th July 2012 We are taking part in the above contest from our normal spot on the coast just to the south of Castle Douglas, Dumfrieshire. The contest runs from 15:00 on the Satur-day until 15:00 on the Sunday. For the whole 24 hours we will be operating 2M & 70cms, on the Saturday up to 23:00 it is 6M and on the Sunday from 09:00 it changes to 4M. We go down on the Friday afternoon and start with building the con-test station. If you wish to join us then drop myself and John MM0CCC [email protected] an email to help with the planning that is required.

As far as I know the following people are already going but could you please con-firm as well… If I have missed anyone out then apologis-es…. GM4UYZ, MM0CCC, MM5AHO, MM0DXC, GM0RLZ, MM0VTV, MM0VPR, MM0GZA, MM0FZV, MM0INS M0RNR There is a forum running on the website for this event so any please add any up-dates there. Many thanks for your cooperation in helping us with the planning. Bob GM4UYZ

Rank Callsign 160 80 60 40 30 20 17 15 12 10 6 4 2 70 DXCCs Slots Range

1 GM4IKT 0 0 0 0 0 49 11 61 0 28 0 0 0 0 105 149 8 yrs

2 MM0XXW 0 6 0 33 17 40 15 49 7 5 0 0 0 0 77 172 6 yrs

3 M0RNR 0 0 0 41 0 48 2 30 0 0 0 0 0 0 72 121 13 yrs

4 MM0GZZ 0 0 0 9 22 33 0 2 3 4 0 0 0 0 51 73 4 yrs

5 GM4UYZ 0 4 0 4 0 30 0 7 0 0 0 0 0 0 33 45 32 yrs

6 MM5AHO 0 0 0 6 0 0 0 14 0 3 0 0 1 0 21 24 17 yrs

7 MM0KTC 0 0 0 1 0 1 3 3 1 0 0 0 0 0 8 9 4 yrs

VHF Field Day

Page 7: Elements 201206

6

1. Which transmission risks overloading a TV mast-head pre-

amplifier

a. 2m FM

b. 40m SSB

c. 80m CW

d. 10GHz TV.

2. A 7MHz SSB transmission is heard as a voice like signal in a neigh-

bours music system that has a medium wave and VHF FM receiver

as well as a CD player. Tests reveal it does not matter which audio

input is selected, it simply needs to be switched on. A possible

explanation is that

a. a harmonic of the transmission falls on the IF of the receiver

b. the signal is being picked up on the speaker leads and detected in

a p-n junction

c. sufficient signal is being picked up for its envelope to excite the

loudspeakers

d. there is direct pickup into the very sensitive CD laser amplifier.

3. It is noticed that when a nearby amateur operates on 3.78MHz, his

voice and another female voice on 3.60MHz are both heard interfer-

ing with a world service broadcast on 3.96MHz.Inspections of

both amateur stations give them a clean bill of health. The interfer-

ence may be caused by

a. one of the amateur stations overdriving their PA

b. a corroded contact in some metalwork

c. an image frequency in the receiver

d. a fault on the world service transmitter.

4. A neighbour complains that he is getting a repeat TV picture about

1cm to the right of the real picture, especially on bold sharp edges.

You should

a. check you log for any correlation with the times of the complaint

b. advise the neighbour that he needs to get a filter fitted in his aerial

lead

c. say that it is not something that could be caused by amateur

radio

d. suggest that the neighbour calls Ofcom to get the matter sorted out.

5. What should the point marked 'X' in the drawing be con-

nected to?

a. The centre of a balanced feeder.

b. The earth point on an antenna tuning unit.

c. The safety earth point on a transmitter.

d. The braid of the feeder connection on a balun.

6. Several ferrite rings are fitted over a two-wire ribbon

feeder. This is found to have no effect on the trans-

mitted signal. Why?

a. The ferrite is not very effective at radio frequencies.

b. The RF currents are in phase in each conductor and have no net

effect.

c. The transmitted signal is a common mode signal and not affected by

the ferrite.

d. The transmitted signal is a differential mode signal and not affect-

ed by the ferrite.

7. Tests suggest that RF is being picked up on the loudspeaker leads

of a music system and the speech is heard from the loudspeak-

ers. Which cure is most likely to be effective?

a. Fitting ferrite rings at the loudspeaker ends of the leads.

b. Fitting ferrite rings at the amplifier ends of the loudspeaker leads.

c. Fitting 0.1μF capacitors across the loudspeaker terminals.

d. Fitting 1000μF capacitors in series with the speaker leads.

8. The drawing shows a coaxial stub to remove a 2m amateur

signal from a 100MHz VHF transmission. The stub should be

a. λ/4 long at 145MHz and open circuit at the free end

b. λ/2 long at 145MHz and open circuit at the free end

c. λ/4 long at 100MHz and open circuit at the free end

d. λ/2 long at 100MHz and open circuit at the free end.

9. A 2m amateur antenna and a broadcast TV antenna are mounted on the

same roof. To minimise the risk of problems it is helpful to fit a

a. high-pass filter in the TV down lead

b. low-pass filter in the TV down lead

c. high-pass filter in the amateur feeder low pass filter in the amateur feeder.

10. The field strength 20m away from an antenna of 10dB gain fed with

40W is

a. 7V/m

b. 140V/m

c. 0.08W/m2

d. 0.8W/m2.

Test Your Knowledge

X

Page 8: Elements 201206

Contacts

General correspondence,

training and contest en-

tries

Bob Glasgow

7 Castle Terrace

Port Seton

East Lothian

EH32 0EE

Phone: 01875 811723

E-mail:

[email protected]

HF Contests

Cambell Stevenson

[email protected]

VHF Contests

John MacLean

[email protected]

Club Tables

Bob Purves

[email protected]

Contest Reports

Robin Farrer

[email protected]

Newsletter, website,

event calendar

John Innes

[email protected]

1 June 2012 Club Night

2 June 2012 Port Seton Gala Day

10 June 2012 PW 144MHz QRP Contest

16/17 June 2012 Museums on the Air Weekend

Museum of Flight—East Fortune GB2MOF

20 June 2012 CPSARC HF Activity night

19:00—22:00

23 June 2012 Newsletter Deadline

29 June 2012 Club Night (moved to accommodate VHF Field Day)

7/8 July 2012 RSGB VHF Field Day

23 July 2012 Newsletter Deadline (early due to IOTA and the Olympics)

28/29 July 2012 RSGB IOTA Contest

Island of Tiree GM2T

3 August 2012 Club Night

10 August 2012 19thANNUAL MINI-RALLY NIGHT

18/19 August 2012 Lighthouses Weekend

Barns Ness Lighthouse GB2LBN

1 September 2012 Newsletter Deadline

7 September 2012 Club Night

28 September 2012 SECOND 144Mhz DF Hunt

Meet in “The Old Ship Inn” Car Park (East) 18:30 for 19:00

29 September 2012 Newsletter Deadline

5 October 2012 Club Night

19 October 2012 Video Night

27 October 2012 Newsletter Deadline

27/28 October 2012 CQWW SSB Contest

Barns Ness Lighthouse—GM2T

2 November 2012 Club Night

23 November 2012

Talk by Dr. Colwyn Jones on ‘SOTA Activation’

Port Seton Community Centre Resource Room 1

19:30—21:30

7 December 2012 Club Night

8 December 2012 Chrsitmas Night Out—TBC

Events Column Answers from June 2012 newsletter “Test Your Knowledge”.

1A, 2B, 3B, 4C, 5C, 6D, 7B, 8A, 9A, 10A