| |
G8MNY > BEACON 04.03.06 18:34l 41 Lines 1618 Bytes #999 (0) @ EU
BID : 19924_GB7CIP
Read: GUEST
Subj: GB3VHF Rebuilt Beacon Accuracy
Path: DB0FHN<DB0MRW<DB0FOR<DB0SIF<DB0SON<DB0HBN<DB0SWR<DK0WUE<DB0RES<ER3KAZ<
UR6IUG<UR7IWZ<SV1CMG<OZ3BOX<LA1SFS<GB7CIP
Sent: 060304/1312Z @:GB7CIP.#32.GBR.EU #:19924 [Caterham] $:19924_GB7CIP
From: G8MNY@GB7CIP.#32.GBR.EU
To : BEACON@EU
By G8MNY (New Mar 06)
Following the RSGB News item on this rebuilt beacon, I have repeated some
tests on the beacon accuracy against my off air TV locked standard while we
still have Analogue TV signals.
Using my digital PLL signal generator with its internal reference locked to the
main Crystal Palace (or Croydon for Five) Analogue TV Tx.
GB3VHF is currently on 144,430,000 Hz with this accuracy..
BBC1 BBC2 ITV1 CH4 FIVE
ñ1Hz ñ1Hz +21Hz ñ1Hz +2Hz
That makes ITV1 & Five Tx low in line frequency when I tested.
To measure beacont, I just set the signal generator to be 1KHz low to
produce a 1KHz audio beat note with my Rx in AM mode, then I measure the AF on
a comms counter. The new beacon data format does not allow much time to do
really accurate measurements (reading say for 10s).
This rebuilt beacon is SPOT on now, & zero beating a rig (dummy load) to it &
calibrating your frequency counter to it will result in a only a few Hz error
at 2M. :-)
Previous beacon measurements were much worse..
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.
Why don't U send an interesting bul?
73 de John, G8MNY @ GB7CIP
Read previous mail | Read next mail
| |
