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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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9th Mar 2024, 8:34 pm | #1 |
Hexode
Join Date: Oct 2013
Location: Peterborough, Cambridgeshire, UK.
Posts: 341
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Yaesu FT736R Transceiver.
Hi peps, i have recently purchased the above t/rx, whilst it seems to be working according to my test setup, power/frequency and mic mod output i was unable to open my local repeater using the correct ctcss tone.
I did however notice that whilst in the transmit mode i noticed that both the tx/rx led,s were illuminated. has anybody come across this problem and its cure. Is there a bit of test kit that can identify the ctcss tone being transmitted?. my mod meter 9008? shows transmitted audio output without any input from the mic, would that be the ctcss amplitude?. Any and all help appreciated. TIA. |
10th Mar 2024, 12:28 am | #2 |
Nonode
Join Date: Oct 2010
Location: Tintinara, South Australia, Australia
Posts: 2,347
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Re: yaesu ft736r
The 736R is notorious for power supply problems - bad electro caps - so that might be a possibilty.
For interest, info on replacing the power supply with a more efficient unit is here https://gm8bjf.joomla.com/articles/2...e-yaesu-ft736r To measure the CTCSS frequency, best would be to get inside and check at the point where it is generated first (haven't looked at the manual, so can't say "test at this component"). |
10th Mar 2024, 9:23 am | #3 |
Heptode
Join Date: Sep 2009
Location: Tonbridge, Kent, UK.
Posts: 689
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Re: yaesu ft736r
Lots of cheap wee VHF handheld frequency counters out there that display frequency and CTCSS.
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10th Mar 2024, 10:15 am | #4 |
Hexode
Join Date: Oct 2013
Location: Peterborough, Cambridgeshire, UK.
Posts: 341
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Re: yaesu ft736r
Good morning Tel, thanks for your advice, have to say that the PSU in the 736 is as new, i was at the end of rebuilding a spare that i have with new caps, 'R's etc, when i unscrewed the cover to change the unit i found that it had already been done. a bonus.
Now onto ex-seismic, who hails from my home county, Paddock Wood to be precise, i will look at the various radios with that on board, thanks |
11th Mar 2024, 11:41 am | #5 |
Triode
Join Date: Jun 2011
Location: Marlow, Buckinghamshire, UK.
Posts: 34
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Re: Yaesu FT736R Transceiver.
Does it have the CTCSS Board fitted as the FT736R didn't have them fitted as standard
Many Thanks Steve |
11th Mar 2024, 8:49 pm | #6 |
Hexode
Join Date: Oct 2013
Location: Peterborough, Cambridgeshire, UK.
Posts: 341
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Re: Yaesu FT736R Transceiver.
Hi Steve, have fitted the CTCSS module, didn't check to see if I had the problem in the 1st instance, busy LED seems to flash on voice peaks, thought it may be due to ALC but I have had good audio reports so I am not over-driving the mic circuit. Changed the control board after cleaning the glue that held the button cell in place, I understand that it goes conductive in its old age.
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29th Mar 2024, 11:22 am | #7 |
Hexode
Join Date: Oct 2013
Location: Peterborough, Cambridgeshire, UK.
Posts: 341
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Re: Yaesu FT736R Transceiver.
update on the 736, ctcss now working, also another user of the 736 has stated that his 3 ? radio's all do the same, so a peculiarity with these radios.
cheers and beers, Snowy |