Re: LF: A good night on 472

[wolf_dl4yhf <dl4yhf@freenet.de>]

Hello Pete,

That's interesting - I am also continuously trying to improve the RX situation here (and at the club station DF0WD) with different levels of success. Tried various miniwhips (original; with other transistors; with parallel resonant filters at the frontend; etc) but never got it working as successfully as others. At the club, the wire antenna still performs best (with the antenna ground disconnected from mains ground during RX).
At home, an active loop antenna, operating into a low impedance amplifier, works best (even much better than a tuned resonant loop) because it's more immune to E-field pickup.
Noise levels on a 500 kHz wide spectrum are also lower on 472 kHz than on 500 kHz; possibly less gadgets here (like DC/DC converters designed to operate on ..guess what.. 500 kHz) :

http://www.datasheetcatalog.org/datasheet/vishay/71815.pdf


73,
  Wolf .

Am 05.01.2013 11:03, schrieb M0FMT:

Hi Wolf and Graham

 

It was so nice to hear the band literally full of CW. And thanks for the info Wolf publishing your working conditions is very helpful. In my case I am interested in the RX side as well. I am currently using  on RX a 2m 7/8th whip at 50ft+- connected straight into my TS690s transceiver, have 500 / 250 filters fitted. Although signals are not strong they are all good copy and both sides of each qso was readable. The noise level was very low. If I use an open wire ant those signals I can hear are very strong but the far stations are lost in noise. So the noise I am getting is from the house  (mine and next door) low down. The whip seems mostly out of range of the worst noise. That may be of use to you Graham. However I know you are not the only one to suffer from the Xmas decorations at the moment. Also 472/9 seems a quieter part of MF than 501/4. The general noise floor on the SDR is lower but I don't know why.

 

73 es GL Pete M0FMT IO91UX