Any ideas why this one only has 3kc slide each side?
Faulty 15mhz crystal? Varicap?
Cobra 148gtl dx only 3kc shift PB010
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Re: Cobra 148gtl dx only 3kc shift PB010
Hi markasterix yes could it be or bad disk cap or bad inductor .etc . Check all vco components and all voltages. Gd luck n cheers.
Last edited by speeddemon on 20 Dec 2017, 23:28, edited 1 time in total.
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Re: Cobra 148gtl dx only 3kc shift PB010
What mods has the radio had?
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Re: Cobra 148gtl dx only 3kc shift PB010
Hi Tim none but the crystal has been changed
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Re: Cobra 148gtl dx only 3kc shift PB010
This can happen if the oscilators are not set up correctly. With a frequency counter you should read the main oscillator and BFO frequency at the test points inside the radio. Had the same issue years ago with a SS360FM. Service manual helps.
- cb4ever104
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Re: Cobra 148gtl dx only 3kc shift PB010
Is the replacement a Uniden crystal ? I think I remember someone (probably Nick) saying that the Unidens have a wider "Q" than others . I would definitely start there if it isn't .
S.
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Paul aka "Sammy". (108) PY60 Old Paisley DX Group (RIP Rab Markie)
Ex GM0 , now EA5 .
Handle "Fortune Hunter" back in "the day"
Radios ....? Anything that says "TAIWAN R.O.C" on the back.
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Re: Cobra 148gtl dx only 3kc shift PB010
You're correct Sammy. The aftermarket Crystals are very narrow compared to the original and will top out at around 3Khz. That would make sense in this case.cb4ever104 wrote: ↑22 Dec 2017, 11:35Is the replacement a Uniden crystal ? I think I remember someone (probably Nick) saying that the Unidens have a wider "Q" than others . I would definitely start there if it isn't .
S.
Never, ever, ever....bloody anything ever!
Far too many radio's to list here. But I do own a legal one...
Far too many radio's to list here. But I do own a legal one...
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Re: Cobra 148gtl dx only 3kc shift PB010
Originals are like hens teeth