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Date: Mon, 23 Jul 2012 13:21:53 +0200
From: =?UTF-8?B?U3RlZmFuIFNjaMOkZmVy?= <Stefan.Schaefer@iup.uni-heidelberg.de>
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Subject: Re: LF: Re: 502 CQ
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Hi Geri,

Am 23.07.2012 08:17, schrieb Holger 'Geri' DK8KW DI2BO W1KW:
> Yes, it's partly due to groundwave/skywave conditions but I am already 
> known as the crocodile (big mouth, tiny ears) over here in Northern 
> Germany because my signal is 599 all around while I can barely hear 
> people.

Mostly the description "crocodile" is used by those who are unable (or 
somehow unwilling) to radiate a decent signal on the band, LF or MF. If 
a poor antenna is used and then just a few 10 watts RF power, then it 
may be normal that you cannot hear them, depending on the path and time 
and QRN situation. If you have a good antenna and high power then it is 
no problem for others to hear you. If those OMs think "i can hear him 
but he cannot hear me, so he is a "crocodile"" then this is not your 
problem. So maybe you simply have a big mouth and normal ears but the 
other station has a small moth and normal ears! :-)

> On LF I had optimized my receiving system pretty much but on MF I have 
> a high noise floor, probably from household electronics.
Hm, normally this is a stronger problem on LF. But PA7EY has reported 
the same, his LF noisefloor is lower...

> One solution surely is to put an e-field antenna some 25m away from 
> the house into the garden, equally far away from all houses in the 
> neighborhood.
Yes this is certainly a good idea. For me this is no option though.

> Currently I am using my transmitting umbrella antenna to receive, 
> which always proved best on LF but probably needs some re-thinking for MF.
My transmit antenna produces a big receive signal level of course but 
the S/N is at least 6 dB worse than the small active E field probe 
produces! (Of course i used an attenuator to achieve the same signal 
level, for comparison).



73, Stefan/DK7FC