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Date: Mon, 16 Apr 2012 19:29:38 +0200
From: wolf_dl4yhf <dl4yhf@freenet.de>
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Subject: Re: LF: Titanic acty
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Hi Walter and group,

Ok - crossband switching was also a problem here (at DF0WD).
I have solved it with an additional 'auxiliary' antenna dedicated for 
MF. Maybe you can put up something similar for 80 or 40 meters :

http://www.qsl.net/dl4yhf/mf_reception/MF_Reception.html

(contains a photo of the MF reception setup used last weekend at DF0WD. 
The coil is a bit oversized for reception, but who knows... one fine day 
we may be allowed to transmit on MF in Germany, too ...)

All the best,
   Wolf DL4YHF .

Am 15.04.2012 21:19, schrieb Walter Staubach:
> 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" <dl4yhf@freenet.de>
> To: <rsgb_lf_group@blacksheep.org>
> 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
>>
>>
>>
>
>
>
>