[Lowfer] Antenna Problems

Fri, 21 Feb 2003 16:12:32 -0600

Don't feel bad Mitch, I hurt my HP by having it connected to the loop one
night and fired the transmitter up on the vertical which is about 50' away.
It unlocks sometimes when I spin the VFO, but locks fine when I stop tuning
it fast. Yeha. Oh well. Sensitivity is still ok though.

Mike>WE0H
http://www.we0h.us/lf

-----Original Message-----
From: [email protected] [mailto:[email protected]]
On Behalf Of Mitch Powell
Sent: Friday, February 21, 2003 11:14 AM
To: [email protected]
Subject: Re: [Lowfer] Antenna Problems

> Had me scratching my head too but Mitch's signal was
> still very strong maybe I was capturing the underground wave
> segment of Mitch's signal!
>
> Lloyd always has good captures up there!
Larry:

Getting pretty frustrated here trying to receive. De-sensing of receiver
below 1 MHz..... about 15-20 dB. HF ( 3-30MHz) fine.
I think I have probably cooked something in the 100 kHZ - 1 MHz
section of the receiver.  When using this range, no preamp is available, so
it is obviously switched automatically.
Going to order the service manual today from Drake.
I guesstimate that I have cooked an FET or IC associated with that
section of the input filters, but without a circuit I don't want to
proceed at present.

By adding an outboard preamp ( Lyle's of course ) I can bring the
sensitivity back to normal in this frequency range.

Guess I'll keep transmitting for awhile yet !
Maybe it's the 70 watts - across the yard - and the receiving antennas
within 50 feet.... hmmmmmmmmmmm !

Mitch