Re: FT980 dose not recieve
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Very thanks, Mat and Dave for explanations. I have now the Tech Supplement and read the procedure about BFO VCV in pag 23. But now I have another question:
"I understand it could be a problem of shift of frequency in BFO due of out of value of the trimmer. BUT, why the left meter on the radio indicates a value, like it could be a final power state current?
Best regards, CP6CL
Dr. José Carlos León Ortega UDI- Universidad para el Desarrollo y la Innovación Tel. (591 3) 3422525
Santa Cruz - Bolivia
On Tuesday, September 21, 2021, 08:34:09 PM GMT-4, Dave Thompson <thompson@...> wrote:
The BFO VCV problem was described in the FOX TANGO newsletter in about 1984.? Thanks to N8TW for pointing this out.? I replaced the trimmer in my first FT-980 I bought in 1983.? That GT-980 is running strong at N4PL. Thanks to N8TW to pointing to the .Yaesu Tech Supplement page covering this...
Being out of range means the FT-980 does not receive.? The first notice of a problem is that the tone is not the same on LSB as on USB.? Thank goodness it is an easy fix,
73 Dave K4jrb?
-----Original Message----- From: < [email protected]> Sent: Sep 21, 2021 6:07 PM To: < [email protected]> Subject: Re: [Yaesu-FT-980] FT980 dose not recieve
I had to eventually replace this capacitor, as the original drifted completely out of range. It is very common. The capacitor is TC4001 ... it is located under a "can" with a hole to adjust. You can see if it is operating by putting a voltmeter on TP4004 (right near the cap): it should read between 3V to 6V depending on USB/LSB setting, and IF-Shift position. The adjustment procedure is called "BFO VCV", and you can find it on page 23 of the Technical Supplement in the files section. -- -Mat Breton, N8TW
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