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Hi This is a high gain amp see spec 73 Andrew Sent: 18 July 2022 17:37 To: Andrew Lenton Cc: [email protected] Subject: Re: [YaesuFT847] Check Pin 8 gets its supply either 5V 8v or 12V or raw 13.8

Pin 8 was showing about 4.1V

Will do, have to check those tonight.

Check TP 3009 UHF switch on and VHF switch on TP3010 Sent: 18 July 2022 17:23 To: [email protected] Subject: Re: [YaesuFT847] Schematics? Hi Andy On J3005 (VHF) I was getting about 1.4V, on J3006 I

Also check TP 3009 below, should go low on TX, it pulls D3035 and D3036 on so the RF signal can pass through 73 Andrew Sent: 18 July 2022 13:44 To: [email protected] Subject: Re: [YaesuFT847]

Hi Andy On J3005 (VHF) I was getting about 1.4V, on J3006 I was only seeing about 43mV. These measurements were taking of the output pin (pin 5) of each UPC1677C feeding J3005 and J3006.

Measure J3005 and J3006 let me know what you get Sent: 18 July 2022 13:20 To: [email protected] Subject: Re: [YaesuFT847] Schematics? Comparing the output of Q3002 to Q3007 on the UHF side (both of

Correct, as crude as it is!

Let me check and get back these voltages are on your RF probe right? Get Outlook for Android

Comparing the output of Q3002 to Q3007 on the UHF side (both of the RF board) I'm seeing about 1.4V out of Q3002 pin 8, whereas I'm only seeing about 43mv out of Q3007 on pin 8. I see RF Parts has the

All the adjustments look to be within spec. I had a look at Q3007 (UPC1677C) I compared the readings against Q3011 and I am getting nothing on pin 5 of Q3007. I am getting just over 4V on the KEY

True we can deal with this later 73 Andrew Sent: 17 July 2022 20:05 To: [email protected] Subject: Re: [YaesuFT847] Schematics? That’s probably the radio off! 5ppm x 145 on 2m or 725hz and 5ppm x

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 need

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 typos.

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