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Vintage Amateur and Military Radio Amateur/military receivers and transmitters, morse, and any other related vintage comms equipment. |
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18th Aug 2019, 10:14 am | #1 |
Pentode
Join Date: Oct 2018
Location: Carrickfergus, County Antrim, Northern Ireland, UK.
Posts: 126
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Yaesu FT2980
Hello, does anyone have information on this model please. A friend asked me to have a look at this radio as he was of the opinion it was off frequency on transmit. I opened it up and did not see any adjustable components such as a trimmer capacitor to set the reference crystal to frequency. I did however see that it was set to wide spacing which would give too much deviation for the channel spacing we use now so I set it to narrow. This is possibly why he was under the impression it was off frequency. I would have thought however there should be at least a trimmer to acurately set the frequency. My main background is PMR and in those sets there are frequency trimmers.
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18th Aug 2019, 10:24 am | #2 |
Nonode
Join Date: Nov 2015
Location: Welwyn Garden City, Hertfordshire, UK.
Posts: 2,015
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Re: Yaesu ft2980
Quite possibly the reference is some VCXO and the adjustment is done by software...
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18th Aug 2019, 11:09 am | #3 |
Dekatron
Join Date: Aug 2011
Location: Newcastle, Tyne and Wear, UK.
Posts: 11,567
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Re: Yaesu ft2980
If you are looking for a means to adjust the overall frequency, presumably you must have some means of measuring the frequency to see if it really needs adjusting before you go looking for the means by which to adjust it?
Last edited by SiriusHardware; 18th Aug 2019 at 11:36 am. |
18th Aug 2019, 3:34 pm | #4 |
Pentode
Join Date: Oct 2018
Location: Carrickfergus, County Antrim, Northern Ireland, UK.
Posts: 126
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Re: Yaesu FT2980
Thanks for the replies, I have a Marconi 2955a so I do have a frequency counter. I will be looking at that tomorrow but as I said I reckon the problem was that the radio was set on Wide rather than Narrow.
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