Recent content by David Springmire

Good morning, thanks so very much! I ordered the 12255 coil. I'd like to get (2) but looked like only (1) available. I emailed on the off chance they may get more in. Thank you too for the output power and mixer information! Now to try and get these mods in order, align it and Good Lord...

Oh, one other point if you're curious or maybe you all know the answer the NG L44 measured 1.2uH with the slug in the position shown and Z measured about 370 ohms.

Good evening all, I hope I don't offend anyone with the long post but if you'll bear with me at the end of this I do have a question. Just thought you might be interested in the result. I want to thank you all so very much for your quick responses, ideas, feedback and all around encouragement...

Good evening and thank you. Initially the receive sensitivity was very poor too. I aligned the PLL and the receiver, that got the receive to near spec. Next, went to align transmit and noticed AM RF power was low. I thought that was the only issue but found the mod where they removed the on...

Ok, I'll get on those caps next and give you the results. Thank you!

Great, thank you. AM with no modulation RF power = 4W A= 5.12V

Good evening, I wanted to make the measurements first and see what you thought before looking at why I'm not seeing 12.5V there may be something you see that explains it. These voltage measurements are taken in SSB (USB) using a 30mVrms (1KHz) sinewave and mic gain set to maximum. (RF output...

Thank you so much for the detailed explanation! I need to walk through this step by step so it may take a bit for me to wrap my head around it. I'll make measurements tonight and give you the results. Thanks again!

Okay, Great! Thank you!

Oh, and to your point, I can't find a "real" schematic for this unit anywhere, it seems to most closely resemble the Galaxy DX-2547.

Thank you, that's a really good question. I'll need to go back and fix the SWR cal control, it's just disconnected right now. There are 3 other mods I see - 1). The bright/dim switch (using AM CH.20 as a reference) in one position shifts the frequency from 27.2050 to 27.8450. 2). In one...

One additional note, at 100% modulation AM RF output is just over 5W but the mic gain control is set to only "1" on the silkscreen of the faceplate. Turning the mic gain any higher produces distortion.

I'm sorry maybe I misunderstood. I set AM power to 4W dead key no modulation (audio generator off) and mic gain at minimum. Then when using 30mVrms (1KHz) into the mic input and adjusting mic gain to maximum it increases to 6W although the AM envelope as mentioned is very distorted.

Thank you! Yes before I removed the mod where they used the SWR cal control for the RF power, in dead key (no modulation) I was getting about 6W. Then I removed the mod, re-installed the 5K ohm on board pot and adjusted to about 4W dead key. The huge swing is still present when adjusting the...

Thank you for explaining. I used your earlier explanation to check the 4 coils in the transmit chain. They each behave as you explained having 2 peaks one above the can and another "true" peak closer to center of travel. I set the bias according to a manual I have to 50mA and 100mA both...