Hello Roelof, VLF, LF, but also HF, VHF, UHF and SHF :-)
Today I will try to ad some stabilyzers, filters, C's and Choces at the powers supply Mini Whip input.

That single 9 volt battery block was empty after 12 hours.
It did drop from 9.4 to 7.3 in 12 h.
A bit expensive to buy 2x 9v batery's a day :-)

73's Peter, PA1SDB

http://www.qsl.net/pa1sdb/





----- Original Message ----- From: "Roelof Bakker" <[email protected]>
To: <[email protected]>
Sent: Sunday, March 25, 2012 6:45 PM
Subject: Re: LF: Re: Power experiment / Mini Whip / 8970 Hz !

Hello Peter,
I found that a BFQ19S gives slight better strong signal handling 
performance.
But more important, it works better at a lower supply voltage.
So, for use with a 9V battery, the BFQ19S is recommended.
At 12V you will not notice any difference.
You could also try to feed the antenna direct from a battery by a separate 
two wire DC cable, instead of over the coax cable.
In this case the antenna interface can be omitted.
It is best to place the battery at the foot of the mast.
There are more options, like using CAT5 cable, isolating transformers etc.
However, it all depends on your specific location.
73,
Roelof, pa0rdt