: From: "Tom Tishken KD4WOV" <kd4wov@earthlink.net>
: Has anyone any experience or schematics for preamps for
: VLF around 110khz to 190khz?
Hi Tom,
Yes, send my your Mailing Address and I'll pop you off a photo copy
of a nice one. It would be worth your while to try and find a copy of
the Low Band Experimenters Handbook by an East Coast Ham who
I believe is now an SK :-( Great book to have around.
: Any thoughts about simple preamps with a tunable preselector and gain
: controls?
I "lifted" one preamp design from a 1987 Motorola Loran C
Automatic Vehicle Location "AVL" unit I often serviced. You need
lots of gain to dig out 100KHz GPS has pretty much killed
regular Loran C applications.
: Any thoughts about HF monoband preamps?
: Any thoughts on HF mono band preamps with a very narrow bandpass to
: eliminate blanking due to high power SW stations?
A lot of "Loafers" prefer highly directional antennas... loops and all
that
type of thing.
: In contesting has anyone used preamps with AGC?
I gotta laugh at this one... rf wise, contesters often have AGC and
compression, but the proper operation of is often in question by
others on the band.
: Last question:
: Has anyone used negative feedback with transistor amps
: for better linearity?
Yes, but you might want to be more specific...
cheers
skipp
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