Wolf,
my progblem is - I have only one wire for 600m, 80m and 40m. So
switching with all the inside- and outside coils and tuning takes a lot of
time. I think it is the same with DI2AF.
73
Walter DI2AG / DJ2LF
----- Original Message -----
From: "wolf_dl4yhf" <[email protected]>
To: <[email protected]>
Sent: Sunday, April 15, 2012 1:40 PM
Subject: Re: LF: Titanic acty
Greetings all,
Nice activity on MF last night. Would have liked a bit more crossband
activity (especially from the DI stations) but none of them seems to have
been active for xband QSO with those poor fellows without tx permission on
500 kHz.
I could significantly improve the rx quality at the club station (DF0WD)
so a couple of QSOs was possible with "armchair" copy this end (rx on MF).
Thanks everyone involved, especially Finbar and Graham.
The big difference was a large resonant tuning coil (which will one fine
day be used as a loading coil). 20 cm long, 15 cm diameter, 60 turns of
1.8 mm enamelled copper wire neatly separated by a plastic wire
("Maurerschnur" in german, can't translate that into english). L approx.
320 uH, and Q at 500 kHz about 500 (calculated). The primary's ends were
connected to a 10 meter vertical wire, and the "MF earth" on an earthstake
located as far away from the shack and mains as possible. A secondary
winding with few turns (tapped for 50 ohms) acted as insulation between
"shack earth / mains ground" and "antenna earth", spaced a centimeter
above the primary coil layer. When connecting "ground" and "antenna
earth", there was tremendous QRM (only OK2BVG, G3KEV, and IQ2MY audible).
With separate grounds, DI2AG, DI2AF, DI2AM, many UK, PA and OK stations
were nicely audible after sunset.
(crossband) QSO were made with EI0CF, GB100MGY, OK2BVG, IQ2MI. Sorry to
have missed you Mal, you were very solid copy during your QSO with Finbar.
All the best,
Wolf
|
