Re: LF: Re: Power experiment / Mini Whip / 8970 Hz !

[Mauro Bernardetto <mauro.bernardetto@poste.it>]

A trivial idea:
use 2 * 7 A/h battery , one in use, the other under charge ..
every 24 hours a 555 timer and a relais switch between the two battery
..
I plan to use this arrangement ..

73

Mauro IK1WVQ

http://www.qsl.net/ik1wvq/


At 07.40 26/03/12, you wrote:
> 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"
> <roelof@ndb.demon.nl>
> To: <rsgb_lf_group@blacksheep.org>
> 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