![]() #Pace sidetalk 1000b how to#Ĭheck out our awesome Help Center article How To Tune a CB Antenna to learn more. No matter how well you plan out a CB installation, or if you use the highest quality parts, sometimes you will run into problems with your CB system.Closed: New threads not accepted on this page This guide to troubleshooting CB radios and issues will help you find and correct some of the most common problems that plague CB operators. PLEASE PLACE ALL OF YOUR CHANNEL GUARD INSTALLATON QUESTIONS HERE. In some radios if you don't the blanker will not work. Also try to ADD the filter to the exsisting one now you have 2 filters not one. There are a few stations in this area that are to darn loud and bleed all over me. Never confuse me with being "conventional". Then the inevitable drift of any VFO/DDS. ![]() My concern is the wonderful phase noise free crystal and or tube radio would be overcome by the increase in noise floor. Last but not least is I really want to try one of the (how the hell can they sell them so cheap) Chinese DDS's. On another it was magnetic reed switches and refrigerator magnets. One of the front feet on a D201 I built was a rotary switch knob Yeah, I have a "keep them clean" desire also. Either an oscillator per (which seems a waste), or a resistance per frequency or the Motorola switched oscillator or ask Nomad about a modified PAL VFO. attachedĪn attempt to get someone else to do my dirty workĪnd the now seemingly everywhere LTC-1799 Might be time to revisit Motorola's AN-756. No crystals, just the selector and four crystal sockets. Here's one meant to add the needed 4 extra crystals to a Standard Horizon 29 23-channel mobile radio. Only stumbled across these on Ebay recently. This was never legal, but I suspect they were built before those long-delayed type-acceptance limits got published. There had been a few PLL 23-channel radios, but ALL the 40-channel models used the new technology.Īn outfit I had never heard of made "crystal selector upgrade" switches. And the cost of a PLL chip to carve up one or two crystals into 40 channels got cheap.Īs a result, the time it took to redesign new 40-channel models, get them approved, built and into the sales pipeline made a crystal synthesizer obsolete. Second problem, the price of crystals was rising. The shielding and filtering needed to meet these limits could never be retrofitted to a 23-channel radio. There were now limits on what kind and how much "spurious" RF could leak out the the radio. Round about the time those expanded crystal selectors began to pop up the new, and much-tighter performance limits for a legal 40-channel radio were revealed. The FCC took at least half a year to unveil the new technical performance requirements for "type acceptance", the name they used for official approval to sell a radio in the USA. The manufacturers said "No big deal, we'll just sell you the upgraded channel selector".īut two problems intervened. The CB market fell into chaos when the FCC aonnounced the 40-channel expansion. Might have been others, but I missed them. The only one I ever saw that was ever type accepted to sell legally was the Tram D201A. Now here's a murky and largely-forgotten corner of CB history.Ĥ0-channel radios with 16 or 30 or more crystals.
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