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G8MNY > BEACON 20.01.06 18:20l 46 Lines 1880 Bytes #999 (0) @ EU
BID : 14045_GB7CIP
Read: GUEST
Subj: Re: Accuracy of UK beacons
Path: DB0FHN<DB0FOR<DB0SIF<DB0EA<DB0RES<ON0AR<GB7CIP
Sent: 060120/1525Z @:GB7CIP.#32.GBR.EU #:14045 [Caterham] $:14045_GB7CIP
From: G8MNY@GB7CIP.#32.GBR.EU
To : BEACON@EU
Hi & thanks for reading.
Following Andy G0FTD's bul on beacon accuracy standards...
> I've just received the following information:
> The IARU Region 1 Technical Recommendation is for -
>
> 50MHz plus/minus ñ 250Hz
> 144MHz plus/minus ñ 500Hz
> 433MHz plus/minus ñ 2.5KHz
>
> It's also up to individual beacon groups to use whatever stability they
> like (could be a free running vfo if they wanted!).
> - Andy - [End of Message #603850 from G0FTD]
I have been re-doing some tests with my digital signal generator (100Hz-1GHz in
100Hz steps) which can be off air locked to BBC1 TV timebase. (See my bul.."Off
air lock for ref osc." & old "Poor man's ceasium clock" articles in BATC's CQTV
or in RSGB's Radcom).
To measure beacons etc, I just set the signal generator to be 1KHz off channel
to produce a 1KHz audio beat note with my Rx in AM, then measure the AF on a
counter, for very week signals I compare this note with an AF osc & counter by
ear.
Here is my log of 2m amateur beacons some are quite a bit out in frequency
considering that they are allocated only a 1KHz wide channel...
Date measured
Beacon Location Allocation 4/2000 6/2001 1/2006
GB3VHF Wrotham beacon from Kent on 144.430 -800 -1033 -390 Hz.
GB3ANG Scottish "Angus" beacon on 144.453 ? -400 +1900 Hz.
ON4VHF Belgium beacon allocated 144.415 ? +500 +1080 Hz.
F5XM The French beacon allocated 144.425 ? +170 Spot on 0 Hz.
This of course assumes that BBC1 from Crystal Palace are still accurate! But
there is very little difference in my temperature compensated signal generator
shift on TV locking (<100Hz on 2m) when it was set up to agree years ago.
Why don't U send an interesting bul?
73 de John, G8MNY @ GB7CIP
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