Minto, Daniele,

@Daniele: Nice to read you also want to join in on LF! BTW VLF is not forgotten here, i want to come back in September. But want to have the LF system ready for the DX season and wat for lower QRN on the Dreamers Band...
You don't have a licence and cannot TX? Wouldn't it be worth to learn for a licence for that reason? :-)
And have you done further tests on sferics and so on your remote VLF QTH? Any news?
Just got re-fascinated by John/F5VLF about the earth antenna stuff and want to do more experiments on that antenna again but LF improvements are very time consuming! But i have holidays now :-))) I am curious how the earth antenna performs as a RX antenna on 137 kHz (directional pattern and gain and noise). As a TX antenna i will be to lossy i think and its not worth the effort carrying 100s of kg of batteries on the hill for doing some CQ calls that are not answered....

@Minto:
Am 14.08.2011 19:33, schrieb Minto Witteveen:

Above 10 MHz the gain drops off rapidly, it is nearly useless at 14 MHz. a -77 type would be much worse there I think.

Sure. I just talked about LF now. I read the -43 type is suitable for 40...400 MHz, at least this is said in the catalog...

As for the Q: I did a comparison between an FT50-43 and a 14 mm 4C6 (for my 137 KHz low-pass filter, see my website). The Q of the FT50-43 coil was abt 50, the 4C6 – with a lower Al - was 140 !!

Interesting! 140 at which L? I am searching for ferrite cores to achieve a high Q on LF, in the range of 100...1000uH. Where can i get these cores? At RS? Where do you buy them? They are usually samller, cheaper and easier to handle than pot cores.

BTW what do you think about a ferrite RX antenna for LF? Now i'm opening an older discussion i expect ;-)

73, Stefan/DK7FC