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Sent: 13 July 2022 19:25 To: [email protected] Subject: Re: [YaesuFT847] Schematics? The voltages at Q4001 look good, as do the measurements at Q4006. Does the 285mA reading seem

The voltages at Q4001 look good, as do the measurements at Q4006. Does the 285mA reading seem reasonable considering Q4006 is not putting any power out? I think Q4001 is good based on the signal

Greetings, I was wondering and it is possible the question has been asked and answered, so I am sorry then. The FT 847 moni feature for SSB is nice. Is there a way to enable this feature for AM and FM

That is good news, so looks like a drive issue or lack of 73 Andrew Get Outlook for Android

I know the presets you are talking about. The previous owner said 440 was working at one time but hadn't used that band in a while. Went to work satellites and no output. It's not a big deal for me,

Emitter is grounded. There is another possibility. On one of the boards is a line of presets that control output power. It could be that the UHF one is faulty, but I have no idea how that circuit

*Hi Andy, In measuring Q4006 earlier, I get 0.725V on the base, 13.67 on the collector in both TX and RX. * The emitter measures a short to ground. Max

Here is the datasheet for the driver module. You are up against it without basic RF test equipment! Q4001 drives Q4006, so you need to know if Q4001 is working · The Drive is up to

Hi Andy, 285mA when I break the jumper and measure across in TX? mode. Max

Is there anyway with the crude test equipment I have I can check for RF on pin 4 of the UHF module? Does the 3.66V on pin 2 of the module sound right?

Hi Andy, Maybe I didn't measure the current correctly. I put one lead on one of the jumpers and the other lead on the other. Tried both ways and nothing either way. On 2m at 50W my power supply

Ok, this is strange. I am struggling to see how you can have 0.7 volts base, 13 volts collector, but no current. That makes no sense. Time to get a bit creative, and enlist the help of your wife. Try

Hi Andy, You should have? 8 volts tx on UHF, pin 1 of J4007 *7.79V* You should have some voltage, less than 8, on Pin 2 of the module. *3.66V* You should have 13.8 on pin 3 of the module, and RF out

Also put an amp meter in series with TPH and 4003 and 4004, that is what it is for, run around 10 Watts and see that to current is, at 50 Watts I would expect 10 -12 Amps depending on efficiency!

You need to know the level, however, that sound relativity good news, The PA block may be obsolete, but tricky to test with limited equipment 73 Andrew Sent: 12 July 2022 16:01 To:

Thank you Andy, I will report back.

A very quick look at diagram, you should have 8 volts tx on UHF, pin 1 of J4007 You should have some voltage, less than 8, on Pin 2 of the module. You should have 13.8 on pin 3 of the module, and RF

Yes I can hear the UHF signal quite well on my handheld. But no output power shows on the 847's meter. This is probably the pre-drive signal I'm picking up.

Do you have a vhf/uhf handheld? Use on same frequency, with a carefully positioned screwdriver tip on the input of the driver block. Will give a rough idea if you have drive to module. By going on the

No That is a network analyser, as it has reflection ports and through ports, it is not a spectrum analyser, they are different. 73 Andrew Sent: 12 July 2022 14:41 To: