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#1
February 8th 07, 11:37 PM
posted to rec.radio.amateur.homebrew
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Cobra 148GTL for 10 METER
I have an original Cobra 148GTL CB Radio. I know that i can modify it
to operate in the 10Meter band by switching the crystal to a 11.6908MHz crystal. is anybody familiar with this mod? If so, how do i determine what frequency each channel will be at? will i need to purchase a freq. countert o determine what freq. will go with what channel? Also, will my 102: whip work with 10M, or rather will it give me a close enough SWR to suffice, or will i need to purchase a new antenna? Any information or assistance would be greatly appreciated. Eddie |
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#2
February 8th 07, 11:58 PM
posted to rec.radio.amateur.homebrew
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Cobra 148GTL for 10 METER
Not sure of the mixing scheme of the cobra, so I won't comment on that
part of your question. Since the 10M band is higher in frequency than CB, shortening the 102" whip experimentally should get your SWR down...but you will need an SWR bridge to check that (or an antenna analyzer such as the MFJ 259 or similar). Scott john james wrote: I have an original Cobra 148GTL CB Radio. I know that i can modify it to operate in the 10Meter band by switching the crystal to a 11.6908MHz crystal. is anybody familiar with this mod? If so, how do i determine what frequency each channel will be at? will i need to purchase a freq. countert o determine what freq. will go with what channel? Also, will my 102: whip work with 10M, or rather will it give me a close enough SWR to suffice, or will i need to purchase a new antenna? Any information or assistance would be greatly appreciated. Eddie |
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#3
February 9th 07, 12:35 AM
posted to rec.radio.amateur.homebrew
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Cobra 148GTL for 10 METER
Hmm.. ok .. *IF* I remeber correctly, CB SWR meters are good for up to
30MHZ. so I can use the one I already own, correct? Eddie On Thu, 08 Feb 2007 22:58:06 +0000, Scott wrote: Not sure of the mixing scheme of the cobra, so I won't comment on that part of your question. Since the 10M band is higher in frequency than CB, shortening the 102" whip experimentally should get your SWR down...but you will need an SWR bridge to check that (or an antenna analyzer such as the MFJ 259 or similar). Scott john james wrote: I have an original Cobra 148GTL CB Radio. I know that i can modify it to operate in the 10Meter band by switching the crystal to a 11.6908MHz crystal. is anybody familiar with this mod? If so, how do i determine what frequency each channel will be at? will i need to purchase a freq. countert o determine what freq. will go with what channel? Also, will my 102: whip work with 10M, or rather will it give me a close enough SWR to suffice, or will i need to purchase a new antenna? Any information or assistance would be greatly appreciated. Eddie |
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#4
February 9th 07, 02:56 AM
posted to rec.radio.amateur.homebrew
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Cobra 148GTL for 10 METER
Should work fine
john james wrote: Hmm.. ok .. *IF* I remeber correctly, CB SWR meters are good for up to 30MHZ. so I can use the one I already own, correct? Eddie On Thu, 08 Feb 2007 22:58:06 +0000, Scott wrote: Not sure of the mixing scheme of the cobra, so I won't comment on that part of your question. Since the 10M band is higher in frequency than CB, shortening the 102" whip experimentally should get your SWR down...but you will need an SWR bridge to check that (or an antenna analyzer such as the MFJ 259 or similar). Scott john james wrote: I have an original Cobra 148GTL CB Radio. I know that i can modify it to operate in the 10Meter band by switching the crystal to a 11.6908MHz crystal. is anybody familiar with this mod? If so, how do i determine what frequency each channel will be at? will i need to purchase a freq. countert o determine what freq. will go with what channel? Also, will my 102: whip work with 10M, or rather will it give me a close enough SWR to suffice, or will i need to purchase a new antenna? Any information or assistance would be greatly appreciated. Eddie -- Joe Leikhim K4SAT "The RFI-EMI-GUY"© "Treason doth never prosper: what's the reason? For if it prosper, none dare call it treason." "Follow The Money" ;-P |
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#5
February 10th 07, 01:27 PM
posted to rec.radio.amateur.homebrew
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Cobra 148GTL for 10 METER
Yes, no problem at all!
Scott john james wrote: Hmm.. ok .. *IF* I remeber correctly, CB SWR meters are good for up to 30MHZ. so I can use the one I already own, correct? Eddie On Thu, 08 Feb 2007 22:58:06 +0000, Scott wrote: Not sure of the mixing scheme of the cobra, so I won't comment on that part of your question. Since the 10M band is higher in frequency than CB, shortening the 102" whip experimentally should get your SWR down...but you will need an SWR bridge to check that (or an antenna analyzer such as the MFJ 259 or similar). Scott john james wrote: I have an original Cobra 148GTL CB Radio. I know that i can modify it to operate in the 10Meter band by switching the crystal to a 11.6908MHz crystal. is anybody familiar with this mod? If so, how do i determine what frequency each channel will be at? will i need to purchase a freq. countert o determine what freq. will go with what channel? Also, will my 102: whip work with 10M, or rather will it give me a close enough SWR to suffice, or will i need to purchase a new antenna? Any information or assistance would be greatly appreciated. Eddie |
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