Thanks Dave,
I'm also at 348 for DXCC, needing only VP8-S and FT8W to complete the
current DXCC list. After 40 years in the hobby and more than twenty in the
telecommunications industry working with telephones, cellphones, and
commercial two - way radios, I have some appreciation for transmitting audio
in the 300 to 3000 Hz range so that it can be decoded easily by the human
ear at the far end of the circuit.
Having hearing disabilities in both ears has also caused me to do additional
reading on Fletcher and Munson's research and significant experimenting with
the Heil HC-4, TT-715, OMNI-VII, FLEX-1500, and Audacity for processed audio
for DXing.
I've also worked up some good settings for AM using the TT-705 microphone,
200 HZ low end roll-off and 3400 Hz BW in the OMNI-VII, using Audacity but
that's a story for another time and was not what the thread originator asked
about.
73 ES DX,
Gary -- AB9M
-----Original Message-----
From: dhhdeh@comcast.net
Sent: Friday, June 14, 2013 7:57 AM
To: tentec@contesting.com
Subject: [TenTec] RF Speech Processor
Gary is 100% correct if your objective is to work rare DX in a competitive
environment. This can be configured as he describes with great success
towards that end.
Back in the 1970's one of my good friends and DX mentor who was, and is, a
top DX'er around here (#1DXCC, Worked All Counties X4, Worked All Oblasts,
high scores in the DX contests etc) ran a TR-7 with no on-board processor
into two VOMAX RF processors in series (very similar to the TT 234 and
today's digital 715) into a L4-B and then to a 4 element wide spaced 20m
monobander at 75 feet. A big gun DX'er he was.
It wasn't pretty sounding but there was no pileup of that era that he could
not crack with more than three calls. None.
I used to tell him that it sounded like "war" mode but it worked marvels for
his DXing objective back then.
My experience with the 715 using it with my Omni V.9, Corsair II and now my
Omni VII is that it gives my signal the presence similar to having a 600
watt amp in line. And if I really need that contact, I occasionally use it
in series with the rig's on-board SP with similar results to what Gary
describes, being careful of how much of each to use. No tower, beam or
linear here and with #348 for DXCC..... It works.
73 de N1LQ-Dave
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