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June 1984

Beechlog
 
The on-line magazine of the Burnham Beeches Radio Club.
INDEX and ACKNOWLEDGEMENTS

JUNE 1984

1................Index
2................From the Chair
3................News & Views
                 BBRC 1967
4................Absorption Wavemeter
5................Mr Baudot
6................Tech Eds Notes
                 Library/Club Equipment
7................Radio 210
8................Talk-in Station
9................Foxhunt April ' 84
12...............Diary of Events
13...............Membership List
14...............Membership Form





Editor................Dave Chislett G4XDW
Technical Editor......Gerry Thorn   G8VNA
Printer...............Dave Ayres    G6GBC


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        B.B.R.C. Committee

Chairman..............Dave Bentley  G6LKZ
Secretary.............Diana Betts   G4MVV
Treasurer.............Lynas Newton  G6LYN
Member................Mike Brown    G4RAA
Member................Martin Heaver G4WSW

Library...............Dave Bentley  G6LKZ
Club Equipment........Dave Bentley  G6LKZ


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FROM THE CHAIR



Once again it falls upon the new chairman to write his first "From
the chair" for Beechlog, and I find it a pleasure to do so.

Could I first thank all the members old and new for your continued
support, as without it the club would not survive.

I am sure the previous years members will join with me in thanking
Dave Chislett, Peter Harman, Tony Alderman and David Ayers for the
work they did for the club. They will be a hard act to follow.

As last year, the club is again involved in organising the Home
Counties McMichaels Mobile Rally on the 22nd July, and some of you
have already volunteered for various tasks. Last years organisation
of the talk-in station, signs and tent worked very  well. However
let us not rest too much on our laurels there is still much to do
in order to  put on just as good a show as last year. 

As I put pen to paper there are various events being planned for
the summer including the visit to the IBA exhibition, and the
special events station being run for the scouts in Langley Park,
also the committee is exploring the possibilities of the club
having a stand at the Slough Day Show in late August.  

It appears this year the content of the club has undergone a
dramatic change as regards licencees. I remember a discussion in
the club not so long ago to the effect that could we find enough
G4's to run HF gear at a special event station, now we find that
'B' class licencees are in a minority in the club! I'm sure the 10
or so new G4's ( see news and views for call-sign details ED ) will
agree with me when I say thank you to John & Diana Betts, Kevin
Hadley and all the others who took part in the task of tutoring. 

Another thing that is in the wind is the possibility of the club
moving to the new community centre at Haymill School. What! I hear
you say I've heard this one before! well you are right. But we have
had a letter from the people organising the project which is less
non-committal than usual. 

Anyway enough for now and I hope that we can make the BBRC an
active and popular club for everyone.

€CE73's Dave G6LKZ
€PE                               
€HT2 130                    
NEWS AND VIEWS
€HT2 129

A  large  number of the club members have changed callsigns
recently. These are Dave G4XOW(8UJT) Greame G4XOF(noisey queen) Ted
G4XOE(8ZBL) Peter G4XGD(8TBA) John G4XJN(6TXG) Dave G4XDW(8XCK)
Martin G4WSW(6HTF). We wish them the best of luck on the new H.F
bands.

STOP PRESS:G4XPR (G6TXI) George.

Just lately some of the old records of the club have come to light
see article by Eileen. One item of interest is that the club became
affiliated to the RSGB on the 17th March 1969. However it was
agreed to apply at a meeting on the 10.12.67!


The Fox-Hunt on the 8th April (a Sunday ) was poorly attended.
After a bad start the Fox couldn't be heard until a new aerial was
used, the Hunt ended with all contestants coming in within a few
minutes of each other with no clues being given. The winner by 1
minute was G6EIL ably helped by G8XCK. Although G6DRP came in first
he started 2mins before the winning team so was placed second.


The Talk-in station for the Home Counties Mobile Rally will be at
the QTH of G4WVX 3A Lincoln Hatch Lane, Burnham. Tele. Burnham
64415. A map and a list of people who are to operate the same are
given elsewhere in this issue.

€HT2 130
OUT AND ABOUT IN 1967
€HT2 129

The BBRC were very busy in the latter part of 1967. Two VHF
contests were entered on 23rd July and 2nd/3rd September. In the
July contest, 49 stations were worked despite the 4m beam having to
be mended twice. It was replaced before the September contest!

The club was also involved in Jamboree on the Air, as indeed it was
in 1966, using the call sign GB2CS. Involvement with the scouts
continued: on October 7th the BBRC ran a station at the Hedgerley
Scout Troop Sale of Work on 80m using the club's G5RV (whatever
happened to that, I wonder?). Later in the month, a demonstration
station was run in Wilton Park for the Beaconsfield Scouts.

So it was a busy and active year for BBRC: the end of year balance
was #9.15s.7d.

More history next time.

Eileen G6EIL


A WAVEMETER FOR 144MHz


The principle of the absorption wavemeter is very simple.  When a
tuned circuit is placed in an RF field, maximum circulating current
is induced when the circuit is tuned to resonance at the frequency
of the RF field.

This circulating current produces a voltage across the coil, part
of which is tapped off and rectified to produce a current to
operate a meter indicator.  By tapping off only a small portion of
the voltage across the coil the damping effect on the tuned circuit
is quite small.  The tuning of the wavemeter is quite sharp and
certainly good enough to ensure selection of the correct harmonic
of any crystal oscillator likely to be found in a 2mtr transmitter.

Construction

The variable capacitor C1 should be positioned as close to the
inside edge of a plastic box as possible and the coil located
adjacent to this side.  This keeps the stray capacity to a minimum
and ensures that the required range is covered.

The coil is wound with 1.5mm diameter bare copper wire on a smooth
rod former 9mm in diameter.  With so few turns on the coil and by
drilling only small holes to suit the wire gauge, the coil will be
firm enough not to require any further fixing.  A third hole is
drilled through the case wall to allow connection of the detector
diode.

Calibration

This can be carried out using a Dip oscillator or reliable signal
generator to establish the coverage of the wavemeter.  Care should
be taken not to  place  the  wavemeter too close to a dip
oscillator coil if used as the frequency of the oscillator can
easily be "pulled". 

Suitable calibration points can be marked onto the case using
lettraset and protected using a light coat of varnish.


GERRY G8VNA


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Mr Baudot..........
 Or How Fast is your Morse


Most of us as amateurs have come across the term Baud usually in
respect of RTTY i.e 45.45 Baud. However some would be surprised to
know that the term is really misused these days and has more to do
with morse than computers. Did you know that you took the Post
Office Morse test at 1 Baud? The dictionary states that the BAUD is
The unit of telegraph signalling speed and is based on the duration
of the shortest pulse of the code. Unit speed is 1 Baud or 1 pulse
per second. Thus speed in Bauds  S= n/60 where n= the number of
elements per word. The morse speed of 100wpm = 80 Baud. The Baud
was named after Baudot who was a pioneer of telegraphic Signalling.
The term is these days misused and is used as the synonym for Bits
per Second in computer jargon.


Dave G4XDW.

This issue of Beechlog apart from the front cover has been
processed on a BBC computer. ED.


TECH EDs NOTES


Not very much to say about radio this month, but quite a lot on the
building of an extension.    The only major snag so far has been
the drains.  Any new work to drains requires an inspection when the
job is complete, so to avoid trouble later on we ran a test on our
drainage system.  After about half an hour of filling the toilet
pan (with the outlet in the manhole blocked) we thought that there
had to be a leak somewhere.  The next step was to dig up the garden
to try and find the leak.  After a few hours of digging and
breaking concrete the leak could still not be found.  Only one
place left, the neighbour's garden.  Just as well we're on good
terms as we would have to dig under her brick built coalhouse and
shed to replace the pipes.  Just the thought of several hours
trying to break up concrete 6 inches thick made me shudder.  To
make life easier we hired a KANGO to break up the concrete.  In
about half an hour the concrete had been removed.

Luckily the pipes were only about 2 feet down.  The break in the
pipe was located just outside and under the neighbour's back door. 
Carroll soon knew when I had found the leak when I emerged from the
hole green in the face  and smelling disgusting.  The difficult
part now over all that was left was to replace the old pipes with
new plastic ones and fill in the hole.  Looking back I would say to
anyone faced with a similar problem to have a go themselves as it
really can be fun (I think).  The extension is progressing quite
well with all the drains and footings passed by the building
inspector.  Many thanks to Dave now G4XOW for the loan of his pond
pump to drain the water from the trenches.
P.S. Congrats to all with new G4 calls

GERRY G8VNA.

CLUB LIBRARY

	HF Antennas for all Locations			Moxon
	1981 Call Book					RSGB
	Radio communications Handbook			RSGB
	R.S Components Cataloque
	Confidential Frequency List + Supplement

CLUB EQUIPMENT

	1. 25ft Telescopic Mast/base/guys & pegs	(G8TBA)
	2. J-Beam 2mtr+70cms Beam/cables	  	(G8TBA)
	3. 4x23 ele JVL 23cms Beams			(G8XCK)
	4. Tent+Awning pegs				(G8UJT)
	5. G5RV HF Aerial/cable				(G8TBA)
	6. AM. HF Transceiver 'valves req'		(G8XCK)



RADIO 210


Due to the not inconsiderable efforts of Mike G4RAA, some of the
members of the club made a visit to Radio 210 the independent local
radio station for the Reading area on April 30th. I would just like
to pass on some personal impressions of the visit.

The actual station is hidden behind a large house up a country lane
and the first impression I got of the place was it's size or lack
of it. I must admit I expected a larger setup with aerials
sprouting everywhere, but instead it was about the size of the club
QTH.

Having all assembled outside in the car-park, we advanced on
reception where we were met by one of the engineers who also
happened to be an Amateur and after signing the visitors book he
started to show us around.

In the reception area was a large Reel to Reel tape recorder which
logs the whole of the transmission output. After entering the main
building we were shown into the news room, which our guide assured
us was like any other news room. On one of the desks was a teletype
machine similar to my own which I use for RTTY. Also there was a
terminal which received the output of independent news, this was
used for composing news items.

After the news room we were shown around the engineer's workshop
which was an Aladdin's cave of equipment, and rather cosy to say
the least. One particular gadget that caught my eye was a thing
called a profanity delay, giving a 7 second delay to all incoming
phone calls put out on air. The delay gave the engineers time to
switch away in case of swearing etc. Just what we need on "SL".
Other items shown were the hand held tranceivers used on outside
broadcasts.

Next port of call was a empty studio this was the business end of
broadcasting. The D.J's control desk was a mass of switches and
faders, it looked like an expensive piece of equipment but we were
told it was one of the cheap ones. Following on from this we were
taken into a studio which was in use. After a little talk by the
D.J. we were asked to shout hello on the air. Instant fame!

To sum it all up a very enjoyable time was had by all. The set up
seemed to run very well despite being run on a shoestring budget. I
must admit local radio appears less of a lavish setup than I
imagined it to be.


Dave G6LKZ.


TALK-IN STATION DETAILS


The following list is of members who promised help at the talk-in
station for the Home Counties Mobile Rally 22nd July.

		Bruce Gilson		G4WVX
		David Ayers		G6GBC
		Brian Page		G1BAP
		Richard Ashberry	G6RTM
		Diana Betts		G4MVV
		Paul Robinson		G6DVC
		Paul Shayler		G6TSF
		John Williamson		G4XJN

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Map of QTH of G4WVX used for the Talk-in Station


FOXHUNT-APRIL ' 84









G6DVC arrives at G4WSW's QTH with rig, DF loop and a bent Metro.









Half an hour later G6DVC and G4WSW arrive at Upton Park. G4XDW + Co
already there. G6DRP + Co arrive later - but we can't hear the
Fox.(G8UJT) Eventually we receive a very weak signal from the fox,
and take our first bearings.

Windsor Great Park









DF loops are good but you do need a rig as well Paul! or I didn't
know that Concorde was a radio amateur.









After going 3 miles the wrong way we noticed that the signal had
got weaker! Sometime later we arrived at the wrong Pub. After
taking another bearing we were on our way again.









The 3 teams found the fox without being given any Clues! and we all
arrived within 5 mins of each other.

        1st G6EIL + G4XDW.  2nd G6DRP + Co.  3rd G6DVC + G4WSW.









Contestants and fox enjoy a jar after the fun. G6TSF joins the
festivities.

Martin G4WSW


B.B.R.C. Diary of Events



	16th Jan		G4HNL. Worked all Britain Award
	6th  Feb		G8JMP. Airport Radio
	20th Feb		Surplus Equipment Sale
	5th  Mar		A.G.M.
	19th Mar		Computer Forum
	24th Mar		VHF Convention (Sandown Park)
	2nd  Apr		23cms ATV G8LES
	8th  Apr(Sunday)	FoxHunt
	16th Apr                Rally Discussion		
	28/29th Apr		RSGB Exhibition (Birmingham)
 	30th Apr		Visit to Radio 210(12 people max)
	7th  May		Natter Nite
	21st May		Amtor/RTTY G3NRW (Ian Wade)
	4th  Jun		FoxHunt (G4XDW Fox)
	18th Jun		St John Ambulance
	24th Jun		Mobile Rally (Longleat)
	25th Jun		Tour of IBA Exibition
	2nd  Jul		
	8th  Jul(Sunday)	Treasure Hunt
	14/15th Jul             Scouts Demostration Station
	16th Jul		
   	22nd Jul		McMicheal (Home Counties Rally)
	6th  Aug		FoxHunt
	12th Aug(Sunday)	Club Contest
	20th Aug		
	3rd  Sep		Surplus Equipment Sale
	8/9th Sep(W/END)	DX Picnic(Field Day)
	17th Sep		
	1st  Oct		
	6th  Oct(Saturday)	Open Day (Confirmed)
	15th Oct		
	28th Oct(Sunday)	FoxHunt
	5th  Nov		
	19th Nov		
	3rd  Dec		
	17th Dec		

	*******************************************************


MEMBERSHIP LIST


	001	Eileen Chislett		G6EIL		Sl.21896
	002	Dave Chislett		G4XDW		Sl.21896
	003	Tony Alderman		G4LQD		Fc.3286
	004	David Ayres		G6GBC		Md.28108
	006	Paul Shayler		G6TSF		Sl.41396
	007	Bill Perkins		SWL		Sl.32171
	008	Lynas Newton		G6LYN		Sl.75247
	009	Mike Brown		G4RAA		Bn.4262
    	010	John Duel		G6CHO		GX.84366
	011	Dave Lomas		G4XOW		Lt.Grn.2847
	012	Ann Lomas		SWL		Lt.Grn.2847
	015	John Betts		G4HMG		Iver.651652
	016	Diana Betts		G4MVV		Iver.651652
	017	Gerry Thorn		G8VNA		Wey.52775
	018	Carroll Thorn		SWL		Wey.52775
	021	Peter Harman		G4XGD		Sl.28826
	022	David Tanswell		G6LAU		Iver 652412
 	024	Brian Page		G1BAP		Coln.5029
	025	Dave Bentley		G6LKZ		Sl.25101
	026	Kevin Hadley		G4HDK		0734-731026 begin_of_the_skype_highlighting              0734-731026      end_of_the_skype_highlighting
	027	Graeme Platts		G4XOF		Sl.78495
 	029	Graham Stewart		G6HEJ		Fc.5897
	030	Richard Ashberry	G6RTM		Sl.46012
	031	Ted Swaby		G4XOE		Sl.75099
	033	Dave Hemmins		G6DRP		Bn.64436
	034	John Williamson		G4XJN		Sl.24008
	035	George Wall		G4XPR		Fc.5954
	038	Paul Robinson		G6DVC		Rslp.72125
	041	Martin Heaver		G4WSW		********
	042	Ron Howlett		G1BSQ		0895-445006 begin_of_the_skype_highlighting              0895-445006      end_of_the_skype_highlighting
 	043	Bruce Gilson		G4WVX		Bn.64415
	044	Mike Thomson		G6WNU		********
	045	Peter Phelps		*****		********
	046	Janette Phelps		*****		********

	************************************************************
	Please note if your details are not correct please fill in
	the form on the back of the magazine and hand to a committee
	member. This will help us to keep the records up to date.
        ************************************************************

	CHAIRMAN.............G6LKZ DAVE
	SECRETARY............G4MVV DIANA
	TREASURER............G6LYN LYNAS
	ORD'MEMBER...........G4RAA MIKE
	ORD'MEMBER...........G4WSW MARTIN


THE BURNHAM BEECHES RADIO CLUB


G3WIR                                                         G6WIR

The Burnham Beeches Radio Club, affiliated to the Radio Society of
Great Britain, serves the Slough/Windsor area, although it got its
name from its original meeting place - or that vicinity.

We meet twice a month, and our activities cover a wide range of
topics related to radio communications, such as lectures,
demonstrations, and club operating nights; there is also a keen
interest in home computing among our members.

We welcome members of any age and sex, who have an interest in
Amateur Radio, whether they be licenced amateurs or 'Short Wave
Listeners'.

Meetings: 1st & 3rd Mondays of each Month at 8.00pm
       	StJohn Ambulance Brigade HQ
     	Burlington Road          
	Slough.
 Secretary: Diana Betts G4MVV. Telephone. Iver 651652
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MEMBERSHIP DATA FILE

NAME:.................................... CALLSIGN:................
ADDRESS:................................. DATE:....................
        ................................. TELEPHONE:...............
        ................................. POSTCODE:................

BANDS WORKED: HF(               )    VHF(        )    UHF(        )
MODES USED:   CW[  ]    SSB[  ]    FM[  ]    RTTY[  ]    ATV[  ]

MAIN INTERESTS:  (Building, contests, ATV, RTTY etc;)
..................................................................
..................................................................
..................................................................

SUGGESTIONS FOR CLUB ACTIVITIES:
..................................................................
..................................................................
..................................................................

COMPUTER INTEREST:...........  MODEL:.............................
        [All details held in confidence by the committee]

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