My reply to this, if one doesn't have a frequency counter capable of 1 Hz or
better resolution and proper low capacity compensated probes, then they best
leave the cover screws in place and stay out of the radio. Anything else is
a compromise at best.
73
Bob, K4TAX
----- Original Message -----
From: "Ken Brown" <ken.d.brown@hawaiiantel.net>
To: "Discussion of Ten-Tec Equipment" <tentec@contesting.com>
Sent: Sunday, March 29, 2009 2:01 PM
Subject: Re: [TenTec] poor audio on OMNI-V
he tried to set up the bfo adj's ,but didn't have test gear up to the
task.
Test gear needed to adjust BFO crystal oscillator frequencies in Omni VI
(and I am guessing also Omni V)
Method 1, simplest:
1 eA frequency counter with resolution and accuracy down to about 10 Hz
at 9 MHz.
1 eA high impedance probe
1 eA insulated trimmer capacitor adjustment tool
Method 2, if you don't have access to the frequency counter, but more
difficult:
1 eA general coverage receiver that can listen to 9.000 MHz and 9.003
MHz. Doesn't even need to have a BFO.
1 eA 100 kHz crystal calibrator that will generate harmonics up to 9 or
10 MHz (10 MHz so you can calibrate the calibrator against 10 MHz WWV)
1 eA computer with sound card and program that can accurately tell you
the beat frequency between 9.003 MHz and 90th harmonic of 100 kHz.
1 eA high impedance probe
1 eA insulated trimmer capacitor adjustment tool
You can build the probe from a small capacitor and a resistor, or you
may even get enough signal with a little pick up loop on the end of a
piece of coax. Even a plain screwdriver will do, but will require more
patience and finesse.
DE N6KB
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