[ICOM] 706 MK II off frequency

[David J. Ring, Jr.]

Or connect one frequency to the horizontal amplifier of the o'scope, and one 
frequency being measured to the vertical amplifier - and when the display 
forms a circle or line and it doesn't move - the frequencies are exactly the 
same.

For extra fun check out this:
http://www.math.com/students/wonders/lissajous/lissajous.html

73

David N1EA

----- Original Message ----- 
From: "Bob Kulow" <kulow at epix.net>
To: "'ICOM Reflector'" <icom at mailman.qth.net>
Sent: Wednesday, July 06, 2005 6:24 PM
Subject: RE: [ICOM] 706 MK II off frequency




> de WB2CPN             2005.07.06
>
> The frequency error when the 706 is receiving
> can be measured by comparing the audio frequency
> of WWV, when the receiver is in the SSB mode, with
> the WWV signal from a second receiver which in the
> AM mode.

<snip>

Clete's method is really ingenious!

Anybody who has a triggered-sweep scope can use it
to eliminate the need for matching the two tones by ear.

Connect the triggering input of the scope to the audio
output of the AM receiver.

Connect a vertical input to the output of the 706.

When the waveform stops moving left or right, the two
frequencies are the same.

This method was used by Western Electric installation
crews to set the frequency of solid state inverters to
60 cycles back in the 70's.

73
Bob WA2UEH

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