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Hi Ok One thing at a time, let’s look at the low UHF output. If J3006 is low then the fault is not on the RF PA board Go through to 3-2 3-11, it looks like to me something is out of lock or

I think he is saying the service manual, not the menu!? There is a big difference there.? The manual, which I put into the files section I think is a much needed thing for the older radios. without

The Yaesu service manual leaves lot to be desired. I can't get I to the service menu with my mic. The fast button is not working.

That’s probably the radio off! 5ppm x 145 on 2m or 725hz and 5ppm x 433mhz for 70cm is 2.165khz. I would say your radio is in spec in FM. De Spence M0STO Sent while portable! please excuse

Hi this is all covered in the service manual and service menu in the 847, before this address the ref Crystal's oscillators will need tweaking first there are a number of tweaks that will affect the

Hi Andy, also notice when listening to the local repeaters, the discriminator reading on the meter is off to the left. I actually have to tune about 1.5 KHz above the repeater output if I wanted to

Depends on the input, ie might be zero Get Outlook for Android

...and if I measure at the output of Q4001 I get nothing. I think Q4001 is toast.

Hi Andy If I measure at J3006 on the RF board, I'm only getting 60mV This output runs to the input of Q4001 If I reseat the cable and measure at pin 1 of Q4001 I only get 12.5mV ?? Max

OK on your detector probe: 50mW should give 1.6V input Pin4 Q4001 up to 10 Watts so 22V RF output 50 Watts 50V 73 Andrew Sent: 14 July 2022 15:15 To:

I'll have the parts here tomorrow to build the probe. Won't have a chance to look at it until next week, it's my wife's 60th birthday this weekend! Happy wife....

True I know it is tricky, anyhow there is some measuring to do first Sent: 14 July 2022 13:06 To: [email protected] Subject: Re: [YaesuFT847] Schematics? I saw that module. Wondering

Off to lunch back in 90 mins Sent: 14 July 2022 12:47 To: [email protected] Subject: Re: [YaesuFT847] Schematics? Hi Andy 3.66V I'll build an RF probe. Can't find a 1N34A. Any good

I saw that module. Wondering how legit is is? Could be a counterfeit.

If you are referring to the 3.66V, that was on pin 2 of Q4001. I get 13.7V on pin 3. I'll need the probe to measure pin 1 input and pin 4 output.

Sent: 14 July 2022 13:02 To: [email protected] Subject: Re: [YaesuFT847] Schematics? http://guanxin.en.seekic.com/product/integrated_circuits_ics/PF0340A.html Any germanium or Shockey

http://guanxin.en.seekic.com/product/integrated_circuits_ics/PF0340A.html Any germanium or Shockey diode will do just add .6 off a volt OK 3.66V at 50 OHM + 3.8mW to 4mW Where are you

http://guanxin.en.seekic.com/product/integrated_circuits_ics/PF0340A.html Replacement 4001! Sent: 13 July 2022 19:25 To: [email protected] Subject: Re: [YaesuFT847] Schematics? The

Hi Andy 3.66V I'll build an RF probe. Can't find a 1N34A. Any good subs?

Hi max, Check the voltage on Pin 2 of Q4001, this is the power control! 73 Andrew Sent: 14 July 2022 11:55 To: [email protected] Subject: Re: [YaesuFT847] Schematics? Sent: