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Ok some don't, check the input first, you really do need a small spectrum analyser, some SMA flying leads and some SMA attenuators and perhaps a USB power meter? But I will help you all I can from a

According to the NEC datasheet, the pinout matches the schematic.

You have to check it is the right pin out pin 7 and 8 are interchange on the NEC version Get Outlook for Android

I've got a couple on order now just in case it turns out to be the issue. Sure would have been nice if they were socketed. I'll check those other two test points tonight and report back. Thank you

https://www.ebay.com/itm/283401640326?_ul=IN found one for a few quid Sent: 18 July 2022 17:37 To: Andrew Lenton Cc: [email protected] Subject: Re: [YaesuFT847] Check Pin 8 gets its supply

Correct, it is labelled a "KEY" line in the schematic.

Found it Pin 8 is supply 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

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

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

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:

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

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

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