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FT-60 transmitting off frequency on 70cm

 

Hello,

I have noticed that my FT-60 transmit audio is a bit distorted/clipping when transmitting on 70cm. I have tested this with recording the receive audio on my Anytone 878, UV5R and UBCD436 scanner. All of them hear this distorted audio. I set my SDR up to 431.150mhz and when I transmit with the FT-60, it's extending beyond the edges of the 12.5khz bandwidth. The other radios are much closer to the set frequency and don't have this issue. Is there a way to calibrate the FT-60 transmit frequency at all? Can I do it for 70cm only or is there a menu setting of some sort which helps with this? Transmitting on 2m doesn't have this issue as it's much closer to the selected frequency.

Here is my Anytone transmit. It's slightly off but the audio is perfectly fine and readable with no distortion/clipping:




And my FT-60 transmit. It's extending beyond the bandwidth and sounds like it's clipping on louder sounds in normal conversation:



I believe this misalignment or calibration issue is what's causing the clipping/distorted sound. I'd really appreciate anyone's help on this! Thanks.

Ryan - VK3DCR
 

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For ham radio frequencies, the radio should be set for wide. ?Public safety and commercial freqs are narrow.?

Jardy Dawson WA7JRD

Message sent by....Oh look!! Pretty lights!!


On Jul 12, 2024, at 19:00, VK3DCR <ryanmark1994@...> wrote:

?

Hello,

I have noticed that my FT-60 transmit audio is a bit distorted/clipping when transmitting on 70cm. I have tested this with recording the receive audio on my Anytone 878, UV5R and UBCD436 scanner. All of them hear this distorted audio. I set my SDR up to 431.150mhz and when I transmit with the FT-60, it's extending beyond the edges of the 12.5khz bandwidth. The other radios are much closer to the set frequency and don't have this issue. Is there a way to calibrate the FT-60 transmit frequency at all? Can I do it for 70cm only or is there a menu setting of some sort which helps with this? Transmitting on 2m doesn't have this issue as it's much closer to the selected frequency.

Here is my Anytone transmit. It's slightly off but the audio is perfectly fine and readable with no distortion/clipping:




And my FT-60 transmit. It's extending beyond the bandwidth and sounds like it's clipping on louder sounds in normal conversation:



I believe this misalignment or calibration issue is what's causing the clipping/distorted sound. I'd really appreciate anyone's help on this! Thanks.

Ryan - VK3DCR
 

The reference frequency can be adjusted in the service menu.
For details, check the service manual (technical supplement).
Write down the current setting, so you can revert to the original setting, in case something goes wrong.
The use of a good frequency counter is advised.



73, Chris
 

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Could try a factory reset.?


Jardy Dawson WA7JRD

Message sent by....Oh look!! Pretty lights!!


On Jul 13, 2024, at 05:20, Chris <csima@...> wrote:

?The reference frequency can be adjusted in the service menu.
For details, check the service manual (technical supplement).
Write down the current setting, so you can revert to the original setting, in case something goes wrong.
The use of a good frequency counter is advised.



73, Chris

 

Hi Chris,

Is it the PLL reference frequency that needs to be adjusted? Are you able to tell me what the actual function of that is and what I should be looking for when adjusting? I don't have a frequency counter, so using an SDR is the best I have.

Thanks,

Ryan - VK3DCR
 

Hi Ryan,
?
If yor TX frequency is off, then the PLL reference frequency needs adjustment.
It is normal, that a frequency error is about three times higher on 70cm than on 2m.
?
If you record the original setting, you can just give it a try. If it does not correct the problem, you can revert to the original setting.
A trustworthy frequency counter makes the adjustment easier and more precise.
?
It is also possible, that your radio has another problem, not related to the reference oscillator setting.
?
73, Chris
 

I finally got around to adjusting the PLL reference frequency today. I used my SDR and while transmitting, just turned the reference frequency up until it lined up with the desired frequency. Now both 2m and 70cm transmissions are right on frequency and all distortion/clipping is gone. Thanks for your help, Chris!
 

I am glad to read, that it worked for you!
?
73, Chris

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