2002年5月19日 · 138 The 138 XLR does, indeed, have sideband. Do not clip the modulation limiter in this radio. The 138 XLR is one of the few CBs that have been blessed with an audio clipping circuit before the audio branches of into the AM / SSB 'modulation' circuitry. With proper tuning, this is about THE finest sounding domestic CB made.

2022年3月10日 · Cobra Cobra 138 Added by BJ radionut; Create date Mar 10, 2022; Updated Mar 24, 2022; Write a review ...

2008年11月5日 · Cobra 138 /139 alignment info? Thread starter kb6led; Start date Mar 12, 2013; K. kb6led Member. Apr 11 ...

2011年8月3日 · I have to admit I like the way the Cobra 138XLR looks it just has the look of quality and style. Same thing with the early Madisons and Washingtons they just look nice and were well styled. They age well they do not date themselves. You could re-issue the designs today they would still look great.

2008年3月9日 · Cobra 138xlr alignment. Thread starter zinger827; Start date Mar 9, 2008; zinger827 Supporting Member ...

2008年7月31日 · The 139 BASE radio from Cobra - proves this "idea" - because they are possible to be operated in specific conditions of Positive Ground ignition systems - at least the Mobiles could. When you "mis wire" a CB to a Positive Ground ignition system, the CASE has 12 volts on it, it's not grounded it live.

2020年12月11日 · Since this is for a Cobra 138, it better not be wired for electronic switching. You can also look at the PTT switch. By using the meter you can figure out which are the normally open and normally closed contacts, although it should be …

2018年11月2日 · The 138's Filtering AFTER the IF xtal lattice, is based on broad banded discrete Band Pass filtering that was supplanted later using Ceramic and Xtal filtering with tweaks to the IF and used the PLL's own 10.240 standard to make a separate image to 455kHz (hence the AM only 455kHz shift of their 2nd conversion based chassis) But, this circuit ...

2021年11月18日 · Does the 148GTL use the same crystal ? I have a stock 148 with me that I purchased out on the road for cheap and it works. The guy I bought it from wouldn't sell me the 5 pin microphone he had when I tested it as he was short on microphones so I do not have a microphone as the 138 is a 4 pin and the same for the 29. Thanks to everyone for the help.

2019年10月29日 · A good friend of mine gave me this 138. I’ve always wanted one but never could find one. I’d like some input on how the channel selector works because I’ve never used one. Radio does not turn on as it’s been sitting for years. It was built in Japan with serial number 50709688. I’m guessing early 70s.