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uniden pc78xl
- Thread starter AE5RD
- Start date
78xl is pretty much the same radio as the 29ltd.
here is the service manual for the 29ltd. (pages 1-11)
you can get the rest at cbtricks.
http://www.cbtricks.com/radios/cobr..._st/graphics/29ltd-st_29wx-st_sm_pg1_pg11.pdf
later,
loosecannon
here is the service manual for the 29ltd. (pages 1-11)
you can get the rest at cbtricks.
http://www.cbtricks.com/radios/cobr..._st/graphics/29ltd-st_29wx-st_sm_pg1_pg11.pdf
later,
loosecannon
lords
Active Member
PC78XL - CUT D11 - Adjust L17,,L20,L21,L16{Some Models},L14 for max RF output
VR1 rx gain VR2 rx signal meter VR3 squelch VR4 AMC VR5 tx power meter VR6 antenna warning light
should be the same as the 76XL.
VR1 rx gain VR2 rx signal meter VR3 squelch VR4 AMC VR5 tx power meter VR6 antenna warning light
should be the same as the 76XL.
Turning the VR for the AMC up all the way does the same thing.
A clipped radio needs no power mic, just an operator who knows how to operate the mic gain control.
Someone who has to have all the knobs full right needs to stay clear of a clipped radio.
A clipped radio needs no power mic, just an operator who knows how to operate the mic gain control.
Someone who has to have all the knobs full right needs to stay clear of a clipped radio.
It's been covered many times here on the forum so I won't beat a dead horse. If one wants loud blarring splattering audio then by all means, get out your golden set of plyers and yank that baby out. On the bright side, if you plan on running an amplifier then you can bleed into not only your next door neighbors tv and computer but 3-4 houses down as well. What the heck, might as well sound like crap and tick off all your neighbors.
The problem is that with the limiter removed it becomes impossible to maintain modulation levels at a max of 100%.Speaking slightly louder then where the radio was set for 100% at WILL cause overmodulation and splatter.If you maintain lower audio levels to ensure a max of 100% modulation then why not leave the mod limiter in place. I used to run a Midland CB with the mod limiter removed and a.After a year or so I reinstalled the limiter transistor and got my loud but clean audio back instead of loud and distorted splattering signal.
to clip or not
Well I gave the radio a tune and i'm happy to say I left all limiters intact. The modulation was loud just by turning the VR. the radio did 5 watts swinging to 8 on my old radioshack meter. The guy was real happy and he got good reports. I have heard some radios around here where i live that have been tweaked out and they sound like crap. I noticed if you try to get too much power out of a radio with the VR's that it will backswing. I tune till it swings forward and leave it alone. A few more watts won't make a diffrence anyway and 4 clean watts sound better especially if amplified.
Well I gave the radio a tune and i'm happy to say I left all limiters intact. The modulation was loud just by turning the VR. the radio did 5 watts swinging to 8 on my old radioshack meter. The guy was real happy and he got good reports. I have heard some radios around here where i live that have been tweaked out and they sound like crap. I noticed if you try to get too much power out of a radio with the VR's that it will backswing. I tune till it swings forward and leave it alone. A few more watts won't make a diffrence anyway and 4 clean watts sound better especially if amplified.
This was copied and pasted from an old post of mine:
You can also visit http://www.dtbradio.com/amc.html for a bit more discussion of this issue.
You can also visit http://www.dtbradio.com/amc.html for a bit more discussion of this issue.
sometimes I think if it was a perfect world it would be quit boring to say the least . I could just think of a few major amp builders and radio makers that would totally be out to bizz if it were ....but because it isn't a perfect world ,there still in business and going strong. It's almost as if man speak with forked tongue in this business . Go figure ? Is it really about the perfectness of it all or is it about those mighty greenbacks .....Hmmmmm Harmonic this and harmonic that , wonder how many really give a ratts ass about that ? Auh yes , the perfectionists of this world , but even then there's that dreaded forked tongue again and those never ending bills in the mail box or desk drawer waiting to be paid. Well Butch .....I'll agree with you and say that about covers it , But how much does it cover to those that could really care less ? I say this , and it's been going on for decades and decades to come , have fun !! try stuff !! do different things and see how they work out for you. everything that is done to these cb radios is a crime to begin with , so harmonic or not. Have fun and let the other guy on the other end of your transmission be the judge and jury on what's really going on. I just can't help myself from time to time when it comes to fighting the perfectness of the situation. 4040 did a watergate on me a few weeks ago and posted it on the DX contact section of the Forum , Cobra 25 LTD 2 watt swingin 25 cap/resistor mod (no clip) it still don't matter because it's evil in the eye's and minds of the perfectionists. Anyone here can go there and listen to the gate and tell me I sounded like shit or modualated or over driven ? I didn't here anybody telling me about harmonics or that I was bleeding and bothering others , IM not trying to pat myself on the back here , IM just trying to make a point that these radios do not have to be a perfect science to work and to work well same goes for the amp builders and radio designers. My God !! I can only hope for all of you that no matter what , it's all about having fun no matter what your running or doing. Peace