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Works on a 2547 also. Just installed a VFO windup on this 2547 for a local friend of mine, works great, even with clarifier button engaged it still works and settles dead on frequency. 1000uf 25v 105° electrolytic capacitor. Tie positive lead of cap to wiper (flapper, lol) pin of the xmit...

R216 should be a 1 ohm resistor. Also, are you sure the final that vr10 feeds is good? If a final is bad, you won't get any reading on your ammeter when setting bias. Check the collector voltage on the center lead of said final while keyed up (meter in volt mode). R216 = 1 ohm (Brown, Black...

Also, this little coil in the rear is actually two coils butted against each other. Most people don't notice it as being two coils. These must be separated so as not to touch as seen in this photo. Yes, this coil does affect output. Closed = less, seperated in center only = more. Only seperated...

I basically just gave you (above) everything I do to these 3600 boards to get the max performance without harming other parts by heat buildup or creating any harmonics. Besides the alignment steps I go by. Tip: the VCO Buffers and oscillators are the trick (not secret) to receive and transmit...

As for the growling noise, could come from several spots. My experience with the growling while the echo board was connected turned out to be a bad echo board which shorted out the mic op amp (4558). Bypassed the echo board completely, replaced the mic op amp and the growling was gone. Hope the...

Tip for better average swing on all the 3600 boards. Check/replace C133 (10uf 16v). I recommend replacing this cap with a 4.7uf 25v cap. This is the AMC Timing Capacitor. The factory 10uf is a little to aggressive (limits average swing). Also, strap a 22k ohm resistor across this caps leads on...

Wiper is actually what I heard handy and them call it, I was mistaken on who I got the flapper term from. But like cable guy, it's sounds funny so I'm gonna stick with flapper, the word puts a giggle in me also when I say it, lol

Handy Andy and nomad. Guess cause it's quicker than saying "center lead of variable resistor", lol...I just used their term.

Well, tied the positive lead of the cap directly to VR7 flapper. Ran a wire from negative lead of cap to switch in the rear, ran another wire from switch to ground. Settles on frequency on AM with switch on and is dead on frequency with switch off in AM and SSB. SSB seems odd with the switch on...

Was just thinking about that. I was also thinking of how I can determine if it's the wire or switch that's causing it. I figured I could just tie the flapper wire and positive lead of cap together at the switch end of the radio and see how far it goes before setting. If it settles on frequency...

Ok, My conclusion: Either the spst switch is throwing it up 500hz off frequency (27.2055) upon settling, or the type/length of wire in using is causing it to settle at 27.2055 instead of 27.2050. Removed wires for switch all together, switch no longer in circuit. Took another brand new 1000uf...

EPT069610Z board.

What should the value of the added variable resistor be? Same value as the radios stock xmit frequency adjustment variable resistor? I'm assuming the same value.

I have no desire for it neither, but these locals are asking for it, so it's something I need to read up on and learn from so I can see if I can accomplish this for them.

So, if I got this right, I take a separate variable resistor and tie the flapper of said VR to the positive lead of the electrolytic cap. I then solder solder those two together to the center pin of the spst switch. I then take a wire and solder to the unused pin of the spst and run the other...

I've also noticed the receive frequency is affected when the vfo windup switch is flipped on. I then have to turn the clarifier to around 3 o'clock to tune people in on SSB, but when the switch is off everyone is basically at 12 o'clock on the clarifier. This clarifier is stock, all parts in the...

A local friend of mine paid around 1700 bucks for a Stryker 955. He said the tech decked it out with hifi xmit/receive (this info is freely available online), compressor board, echo module, xmit and receive upgrades and VFO windup. Hmmm, from what I see, compressor boards aren't that expensive...

Hi all, Got a 959 on the desk. The owner wanted a VFO windup installed, so I used a 1000uf 25v electrolytic cap. I tied the negative lead to board ground (not chassis) and the positive lead to the flapper pin of the tx frequency adjustment (VR). This radio has a stock clarifier (will not...

No more arguing for me. Stress caused one of my stints to close 100%. Not allowing myself to go through that again. Let them argue with themselves, no one around here believes a word he says anyway, everyone knows he's just an instigator that likes to get drunk and stir up arguments just for his...