mods for 148 gtl

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1iwilly
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mods for 148 gtl

Post by 1iwilly »

hello to all
i have a cobra 148 gtl side mike made in Taiwan looking for some audio mods, not hi-fi not ready for that part yet
and power mod also I know my SSB freq is off the only frequency counter I have is this one dosy FC-50 i have a two-tone audio file to use
my question on USB does it end in example freq=27.2060 or 27.2065 LSB =27.2035 or 272040 ?? clarifier is stock thanks
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ch25
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Re: mods for 148 gtl

Post by ch25 »

Which mainboard?
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1iwilly
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Re: mods for 148 gtl

Post by 1iwilly »

actually is for my 2000 gtl also board=497-AD
148 gtl board is 412-AD
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Otter
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Re: mods for 148 gtl

Post by Otter »

1iwilly wrote: 15 May 2022, 23:18 hello to all
i have a cobra 148 gtl side mike made in Taiwan looking for some audio mods, not hi-fi not ready for that part yet
and power mod also I know my SSB freq is off the only frequency counter I have is this one dosy FC-50 i have a two-tone audio file to use
my question on USB does it end in example freq=27.2060 or 27.2065 LSB =27.2035 or 272040 ?? clarifier is stock thanks
I don't think you can set it up properly with that counter. First you have to set the VCO offsets correctly, then the 10.695 which is mixed to get the output frequency.
As a direct answer to your question though, if you're on channel 20 and put a single tone of 1kHz in on USB it should read 27.206. LSB would be 27.204. If you put a tone of 1.5kHz in they would be 27.3065 and 27.2035 respectively. With a 2-tone file it would be anybody's guess.
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1iwilly
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Re: mods for 148 gtl

Post by 1iwilly »

ok thanks, what about the other mods ??
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cb4ever104
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Re: mods for 148 gtl

Post by cb4ever104 »

I have the 2000 GTL (and 148 GTL) . Not sure why you would want to modify the audio , or power ? I use a Cobra dynamic plus with them both , and get good reports . Both radios have a single final stage , so you're not going to get much more from that stage . Best best would be just to buy an amp .

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1iwilly
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Re: mods for 148 gtl

Post by 1iwilly »

ok thanks
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