Recent content by loosecannon

You might need him to bring the radio and the mic he uses, and at least one of his amps so you can try to reproduce the problem on your bench. he might have some sort of ground loop issue. if that RCI base has its main PC board DC ground isolated from the chassis, he might be connecting the...

can you describe your setup including power and coax connections and also include any grounding? the more detail the better. LC

Disclaimer first. I've never messed with one of these radios, but i wonder if someone would be willing to try an experiment for me in an attempt to help this issue. (this would do nothing for a narrow receiver issue if that's the actual problem) Turn the radio on in AM mode with nothing...

does it happen when the amp is off?

I thought i noticed it happening, but it was just the AC in my house turning off. LC

Doffo, if you compare the schematics, you'll see that this circuit is eerily similar to the AM regulator sections of galaxy and ranger radios that use the 2SB754 (TO-247 style) and the 2SA473 (TO-220). they are basically the same circuits but the parts were beefed up in the later versions...

the channel selector knob and the two switches on the faceplate are clearly from the grant XL. most likely, someone wanted the solid performance of the older grant board but wanted a frequency counter for the extra channels, so they made a combo. i would look as where the frequency counter...

My suggestion is to get yourself a parts rig if you don't already have one. you may need a crystal or some other part that is almost impossible to find, and chances are there are missing parts if the radio has been modded. also be sure to check for L6 and the associated crystal filter. i can't...

sure thing! If you're looking to play a bit further with this, you can try replacing C71 with a 47uF cap, and see how that affects the AMC clamping. And if you want to go even further, you can try strapping a 1K resistor across C71. (you can play with this value a bit) these mods change the...

Good deal Eldorado! Ive honestly never measured the current across this resistor so i can't say for sure what is needed there. everyone just uses 2 or 3 watt resistors there instead of measuring lol. if you are concerned or the 1/4 watt resistor is getting hot when in TX, then you can parallel...

Eldorado, yes that resistor added to the solder side of the board is the one to change the value on in order to raise the deadkey. less resistance equals higher deadkey. LC

one thing you might want to make sure of is that the negative lead of the battery is only connected to ground when the mic is keyed. other than that it sounds like you've got it nailed. LC

575nightrider, your post is actually somewhat understandable, given the current nature of social media in general. In most places, its just a bunch of anonymous accounts all posting their opinions and gripes, and in those places, you'd hardly be the only one with a comment like that. As im...

LOL he sounds like quite a character. Does the 4800 have the board version that uses SMT like the 2950DX? Because i found that the NPC didn't work well in that version, but i also found that it wasn't needed because you almost couldn't make the thing not swing up to max. I can't remember what...

I appreciate the reply. when you say NPC, are you including volting the final along with it? i never do that, but many do, so i feel like i should clarify so we are on the same page. Im also a little confused about what you mean by "certain radios" as the NPC as it pertains to...