Guide :Radio Communications : 148 GTL 120-Channels Base CB Radio

148NW ST No TX AM or SSB

Hiyas. Got a radio here with a problem: radio powers up and receives fine, but when mic is keyed, S/RF meter swings to the right, then drops back to the left. No TX, no modulation. Any idea as to what can cause this? Thanks

Research, Knowledge and Information :


cobra 148 NW ST/ no am tx, ssb tx is fine | WorldwideDX Radio ...


cobra 148 NW ST/ no am tx, ssb tx is fine. Discussion in 'General CB Services Discussion' started by ... The WorldwideDX Radio Forum was originally established in ...
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148NWST Alignment - New - Cobra Technical


148nwst alignment revision: 1.111 ... 148 nw st revision: 1.111 date: ... 1 tx mode, am, ch19
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Help needed for Cobra 148 NW ST | Page 3 | WorldwideDX Radio ...


Help needed for Cobra 148 NW ST. ... The 2200uf cap didn't do squat to fix the TX warble in SSB mode ... on either AM or SSB, the ST does a GREAT job of eliminating ...
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How to Use Your Cobra 148 NW ST - CB Tricks - Home Page


How to Use Your Cobra 148 NW ST ... • Full 4 Watts AM RF Power Ou t p u t • 12 Watts SSB RF Power Output ... the green RT/TX LED will be illuminated.
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Cobra 148NW ST- No TX - The Defpom Forum, for RadioMods, S&M ...


The Defpom Forum, for RadioMods, ... TX light is on when mic is keyed both AM and SSB. I also checked the TX with a hand-held, ... Cobra 148NW ST- No TX.
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Cobra 148 NW ST Blue LED with FC390 - YouTube


Apr 25, 2012 · Cobra 148 NW ST (Sound Tracker) 40CH AM/SSB CB RADIO 27.355MHz LSB Australia and ... Replaced 2digit LED,RX/TX 2 color ... COBRA 148NW ST SOUND TRACKER ...

Cobra 148 NW ST SSB CB Radio - Bob's CB


Classic CB Radio. 40 Channels AM/SSB 4 Watts AM/12 Watts SSB Power 9' Microphone Cord NightWatch TM Dimmer Control ... 4 Watts AM, 12 Watts SSB: The maximum allowed ...
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148NW ST BLOCK DIAGRAM - downloads.cobra.com


148nw st block diagram tr4 2sc1815gr nb agc tr5 2sc1815gr nb agc tr1 ... am rx tx +8v rx +8v +8v dc +13.8v am ssb tx rx cb pa sp pa cb phone ext sp vol tone mic ...
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Suggested Questions And Answer :


On rx , i have a low carrier , sometimes cannot hear someone vs another radio


Depends on how it was modded? Were both the TX and RX broadbanded and tetuned?? Possibly poor work..
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Cobra 140 gtl no modulation on am or ssb - Cobra 148 GTL 120-Channels Base CB Radio


Try another mic or check the mic connectionbernardhttp://www.rylwy.com/
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Cobra 140 gtl no modulation on am and ssb - Cobra 148 GTL 120-Channels Base CB Radio


Replace AM regulator transistor 2SA1012 !
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My cobra 142 gtl loses power about two minutes after keying the mic.


Hiit looks like the output stage is going hot (99%)maby the swr is high end eficiancy is lowusualy on ssb the power is higher than on ambernardhttp://www.rylwy.com/
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SSB off frequency - Cobra 148 GTL 120-Channels Base CB Radio


Your problem is NOT a "tune-up" but an "ALIGNMENT" issue. Tune-ups are simply raising the output and receive capabilities in radios. When you take your radio to a tec, have him install a "swing kit" and ask to have the "dead key" as low as possible (2 watts or under). Ask that he turns up the modulation and NOT CLIP THE RESISTOR!!!. Clipping a resistor can result in an over modulated radio with no control to adjust! Also ask him to adjust the "receive" and make sure it is maxed out!!! I could look up the specifics and tell you where all the adjustments are but it would do you no good if you do not have a watt meter but still, it won't solve the alignment issue so take it to a tec!"WILDCAT" IN LAURELVILLE OHIO35 years into cb's!!!
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Cobra 2000 with a d 104 mic and a palomor tx100 bi linear amp...how can if possible make the amp key up with less than one watt on the ssb side..Radio has a 4 watt dead key on am and i have ajusted the radio to swing no more than 10 watt,,but cut out badly and ssb with the amp on


I have several linear/amps/kickers and my best is the Demco Demon 500 Plus that swings 1500 watts on the A.M. side. NEVER KEY UP MORE THAN 2 WATTS!!! Now to your fix:take your radio to a tec and have him install what they call a "swing kit". Tell him you want the lowest deadkey possible with the highest swing. The lower the deadkey, gets you more audio and you will have the maximum output. Always turn the RF Power all the way down (if equiped). You will need a "swing kit" installed for best performance! Take your linear with you and have him tune it on all setting (high, med, low...etc..,). You do NOT have to have them matched if he does his job right. "WILDCAT" IN LAURELVILLE OHIO35 YEARS OF CB SERVICE!!!
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Low watts out putt


I do not know if that is the case. If it is just the finals, I don't belive they would not be that expensive. I can do some research and see. Off the top of my head, I am unsure of which final they have. You can send me a reply at [email protected]. I drive truck full time and run my cb shop part time. If you are along one of my loads, I can stop off and take a look at the radio. Dean Pitts Rollin CBs Mt. Vernon, TX
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148 gtl receive works fine transmit has no power


If your receive is good and when you key the mic the meter goes to zero...im almost possitive your final is bad. Try it on side band usb/lsb if it transmitts good its the am final or driver.
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Have a cobra 148 gtl cb/ssb. It is brand new. I hvae it hooked up and have tuned the antenna using the swr meter on the cb. I habe channel 1 and channel 40 metting at about 1.6 swr. I have what appears to be good distance reception but little output.


Hi, my name is John. Welcome to FixYa. Check your antenna, you need to set it with a real SWR meter, pick one up at any near-by CB shack $10.00. Thanks for choosing Fixya...John
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148gtl, Taiwan when you modulate the meter swings backwards


In the back is where power mods have been added...It sounds like a swing kit 1/2 watt deadkey to 25 watts which is a powerful modulation exceeding 100%. Its a 220uf capacitor in place of a jumper J1 or J(x) J something in some radios. if you replace the jumper and remove the capacitor 220uf or 470uf one.(near finals it will return to around 4 watt dead key) The result of 4 watts is modulation is flat;where if you adjust it to 2 1/4 watt to say 20 watts it will be very loud and modulation is at 100%.
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