[TenTec] re: 12VDC for Peg or FD

Thomas Jednacz tjednacz at ieee.org
Fri Jun 20 17:33:38 EDT 2003


Buy the correct one and there is no RFI problem plus you get RFI protection
and surge protection from the battery system and all other connected
devices. I use W4RRY's Electronic Battery Booster with my FT-100 with no
problems. My friend uses one with his 706MK something with no problems.

73, Tom, W7QF

-----Original Message-----
From: tentec-bounces at contesting.com
[mailto:tentec-bounces at contesting.com]On Behalf Of al_lorona at agilent.com
Sent: Friday, June 20, 2003 12:37 PM
To: tentec at contesting.com
Subject: RE: [TenTec] re: 12VDC for Peg or FD




> Yep, Ken tx for the pointer to the higher current boosters.
> Good idea for
> the EOC where we'll put an IC-706 in place. The original 706
> we had AF
> quality  degraded noticably below 11.5V, and it would
> actually cut out at
> just below 11V.  We actually have one of the N4UAU boosters on hand:

Hi, Mark,

This is a real issue with battery operation. Lead-acid batteries may start
out at 12.6 V, but very rapidly the terminal voltage drops off more or less
linearly with time.

I have made discharge curves for a 105 A-H lead acid deep discharge marine
battery and in just a few hours of FD-type operation the voltage goes below
12.0 V. To get the full 105 A-h out of the battery, you have to accept
terminal voltage of well under 11.0 V at the end of the discharge cycle. And
as you point out, many radios can't tolerate this. For some radios, the
receiver sound fine and there is no clue to any malfunction but the transmit
signal begins to have real problems with high intermodulation products,
FMing, and other crud.

Anyway, the point I want to make with you is that I have turned to putting
individual nicads in series with the deep cycle battery and adding one at a
time to maintain 13.8V (plus or minus) at the radio. The nicads I use are
large 60 to 100 A-H cells, and at 1.3 volts each it only takes two or three
to keep the total battery from dropping below 13.8 V. The reason why we do
this is that many of those electronic devices that "boost" the battery
voltage generate RFI themselves. There have been many posts here about
switching power supplies and RFI, and these devices operate on the same
principle. Be careful.

Regards,

Al  W6LX
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