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Hello, Does anyone know where to purchase this obsolete mixer IC? Thank you!

I have a Texas Ranger TR 696F SSB that's just driving me crazy. Someone has done countless mods to this unit (e.g. dimmer and channel 9 switches change frequency bands and SWR cal control changes AM RF power). I can't find a schematic for the unit but it closely resembles a Galaxy DX2547...

Nice! Thank you!

Thank you very much for the great detail! I apologize for all the questions. I'll give it a try using that method. I bet you're right and been chasing my tail. That may be the whole issue. Interestingly the manuals I see all say to start in AM but as you mention USB is the only one trimming...

Oh, I see ok. The transmit is fine now just that the clarifier is at two o'clock to get best receive.

Just a quick question, I noticed after getting the pll adjusted for good transmit that the clariifer is slightly off (about two o'clock) is there something I'm missing? Thank you! I'll invest in a SDR too. :)

Tried your trick of using CH 20, USB 27.206 and LSB 27.207 MHz adjusting only the pll/vco with the probe in x10 and counter and that seems to get it spot on! Next I'll check the receive to confirm the carrier oscillators are correct and sensitivity is good. I'll use it as a new method from...

You make a good point. My counter hasn't been calibrated for at least a few years I picked it up on ebay after my old Kikusui failed I purchased another Kikusui but a different model this is a FCO-1120. I thought I'd at least try and get it "close" so I bought a 10 MHz GPS disciplined...

Thank you, yes with both the pll/vco loop and the carrier oscillators.

Thank you very much for the reply, Yes, I did use a scope probe with a frequency counter for both the vco and carrier oscillators in both x1 and x10 modes. I suspected like you mentioned the probe was loading the circuit so I also tried a piece of 50 ohm coax with a stripped back center...

Hello, Really hoping someone with more knowledge can give some guidance. I have a Uniden Madison It had the extra channel mod switches and an open clarifier so I started by getting everything back to stock. Next, aligned it by the service manual for a President Madison since I couldn't find...