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Good afternoon, fellow Drakesters! I have a surplus T-4XB available. It has been aligned and works great. Cosmetically, the front panel and cabinet are good. Output ranges from around 100W on the

I'm fighting a loosing battle! I just measured the voltage coming off of the small board that feeds the PTO its voltage. I measure +44.5 volts! This rig did work but it had a scraping sound due to a

Yep. That’s what I was trying to say. The reason it’s done on 10 is because that’s the most likely band that would give you trouble. Steve Wedge, W1ES Time flies like an arrow. Fruit flies like

Mike, I've read where there are some circuits that can have individual circuitry for each band that allows for "tweaking" the neutralization on each of the lower bands. Of course, the Drake circuits

Barry and Steve, Neutralizing an RF amplifier is occurs ONLY on the frequency it is performed on. This typically is done on 10 meters on an amateur radio transmitter/transceiver final amplifier. Once

Have you tried anything as simple as using an ohmmeter to test continuity between the +10R source and the +10R at the filter board? I mean to the actual +10R point on the board… Gary W0DVN

Yay! Progress! What you have found is definitely not normal. Total hack job. If the ALC is indeed disabled that could be a cause of oscillation if the predriver gain has been set too high. Running a

A word on the nomenclature. Sources marked as +10V are +10 always. +10R is receive only, +10T is transmit only. As Stan commented the R and T voltages are switched on the Transmit Exciter board. The

+10R is provided by Q307 on the transmit exciter board. Sounds like you probably have a bad transistor or other problems on the transmit exciter board. If you want to get rid of it, you can send it to

Hi everyone,sad news. I traced the issue,finally, no 10R getting to the filter board, not even on the socket. Checked the 10R on the psu board, exactly 10.0v Removed The front panel and the two banks

Thanks Rob and Steve; I'll put this behavior down as "normal" -- Craig/W8CS Greenville, SC

I couldn't find the relay in Garey's BOM for the T-4XC. I have found the listing of the original relay in the TR-4C -- it is a P&B R10-E1-Y4-V2.5K I can't see why they shouldn't be the same. The

I never got that far but I have learned to avoid "off" tuning positions with the RF TUNE control. Some of the rigs are more sensitive than others. Steve Wedge, W1ES Time flies like an arrow.? Fruit

I think I found the cause of the watt/SWR meter not working is.? Somebody in the past soldered a white wire from the ground terminal of R2001 directly to ground bypassing C2001 which is supposed to

I have been using a DD-103 digital dial on my R4C to operate in transcieve mode with my T4XB for a number of years.? Works great.? I really like the digital frequency readout.Just be sure to set the

Hi Craig, What you are observing all has to do with mixer injection levels and the source of 5645 kHz local oscillator (LO). The 100 Hz shift is occurring on SSB when the T-4XC is turned on. The 5645

When there are spurious oscillations in the PA tubes, is there a particular frequency this usually occurs? In other words, does changing bands change the frequency of the oscillation? I'm just

That's what I meant to say. Was sitting at the lunch counter with my phone. That's my obvious first check when something like this happens, because that switch won't affect the receiver unless the TX

The "Transceive" switch on the T-4XC is set to "rcvr" -- Craig/W8CS Greenville, SC

Is your receiver function set to RCVR? Steve Wedge, W1ES Time flies like an arrow. Fruit flies like a banana. Sent from [Proton Mail](https://proton.me/mail/home) for iOS