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G8MNY > TECH 11.02.20 10:42z 54 Lines 2190 Bytes #999 (0) @ WW
BID : 44588_GB7CIP
Read: GUEST
Subj: 2M DF ing with just a FT290r
Path: HB9ON<IW2OHX<IR1UAW<I0OJJ<I0OJJ<GB7CIP
Sent: 200211/1039Z @:GB7CIP.#32.GBR.EURO #:44588 [Caterham Surrey GBR]
>From g8mny%gb7cip.#32.gbr.euro@i0ojj.ampr.org Tue Feb 11 11:40:41 2020
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From: G8MNY@GB7CIP.#32.GBR.EURO
To : TECH@WW
By G8MNY (Updated Jan 20)
(8 Bit ASCII graphics use code page 437 or 850, Terminal Font)
I have been using a 2el Doppler DF aerial for many years on 2m DF fox hunts,
but occasionally have trouble with it, & had to revert to just the FT290r &
it's case screened telescopic aerial. This has been surprisingly successful!
S Meter
Shielded ________________________________________
Telescopic³ _ ÚÄÄÄÄ¿ ÚÄÄÄÄÄÄÄÄ¿ /~\ ³Memory
Ant Hole->³ (_) ³====³ ³ 5.5000 ³ "" "" \./ ³
Ú³ ÀÄÄÄÄÙ ÀÄÄÄÄÄÄÄÄÙ |__| |__| ³¿
StrapÀ³ ./"~"\. |__| |__| /~~\ ³Ù
³ /~\ /~\ | | |__| |__| | |³Mic
³ \./ \./ `\._./' |__| [__] \../ ³Socket
ÀÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÙ
Vol Sq Freq VFO1/2
WHAT U HAVE TO DO
1/ To reduce any wrong signal pickup, remove all leads, mic & headphone etc.
2/ Hang the rig on its strap around your neck, tune to Fox frequency, adjust
volume & squelch etc.
3/ Set height of the telescopic aerial for a mid S meter reading.
4/ Turn around using your body as a signal screen, note the direction for min &
max S meter readings.
5/ If the maximum is opposite the minimum, for at least 2 readings, taken a few
meters apart, you should be able to trust that the Fox is in the maximum
reading direction.
6/ Built up areas are full of reflections, e.g. Metal fences, Telegraph wires,
Street lamps etc, so do allow for some false readings!
IN USE
I have won 2 fox hunts his way so far, but it does help if someone else also
agrees with the direction readings on their rig.
See tech Bul "Doppler DF Aerial Design" & "4 Aerial Doppler RDF".
Why Don't U send an interesting bul?
73 de John, G8MNY @ GB7CIP
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