Question about Cobra 148 GTL 120-Channels Base CB Radio

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I dont really have a problem

I just need to know the frequency of LSB and USB on a tone, of lets say 27.205.. My mind keeps saying LSB 27203.7 and USB 27207.3 Have been having to play follow the leader with some folks...R.B.

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THE ACTUAL FREQUENCY IS THE SAME THE ONLY FREQUENCY THAT CHANGES IN THE RADIO IS THE CRYSTAL OSCOLATOR. IT SHIFTS FREQUENCY UP OR DOWN IN THE SIDE BAND MODES. SO YOU WILL TRANSMIT
AT 27.285 ON CHANNEL 19 OR 27.335 CH 35 AND SO ON.

Posted on Mar 12, 2009

  • james morgan Mar 12, 2009

    CORRECTION: IT SHULD READ 27.185 CH 19 OR 27.335 CH 35 AND SO ON

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Uniden washington cb


Is it off on both upper and lower sideband? how about AM? Did someone mod it so that the clarifier works on transmit too? Hope not.
If it is off on LSB adjust CT2 next to C104 and for upper side band CT1 next to C105. You will be tweeking on a capacitor in series with a crystal. caution as it could stop it from transmitting (oscillating) if it isn't set right. best if you use a frequency counter to see if the stage is working right on frequency. Here is a diagram hope you know how to read one. If you dont and you attempt to tweek on this and that, you have a great chance that you could foul it up to the point it wont work at all or sound really bad. The main thing is to narrow it down where the problem is: Is it just LSB or USB or both? If both do not tweek on C1 or C2. I would say it is the 11Mhz crystal area. meaning the problem could be a bad varactor diode, even a resistor or capacitor failure in that portion couldmake it off frequency as the varactor is voltage controlled. By varying the voltage to it, the capacitance changes and therefore changing frequency.
If both uper and lower sideband are off then I suppose AM is off too. the reason you are not being heard as well. Adjust CT3 to bring it back on frequency. You got it CT3 if upper and lower and AM is off or if only lower is off CT1, if only upper is off CT2.
Good luck. I am not responsible for your actions. I am only giving my opinion and logic on this. here is the diagram, dont hurt yourself.....
http://www.cbtricks.com/radios/uniden/washington_mb8719/graphics/uniden_washington_mb8719_sch.pdf

Dec 23, 2013 | CB Radios

1 Answer

Galaxy 959 Testing TP3 for AM, LSB, USB with FC-347 or what other freq. counter can be used for this?


An external freq counter will always do a better test then the one on the unit . Do you have an oscilloscope? A function generator will also have a freq counter . Now the ultimate is a spectrum analyzer. you don't need all these but the function generator will work fine.

Jun 23, 2012 | Galaxy Radios DX-959 40-Channels Base CB...

1 Answer

Ihave a gargeled recive sound


Check the position of the mode selector switch. You may be receiving a SSB (single side band) transmission that is not on the exact same frequency as you or, your radio is in AM or FM mode. You will need to select either USB or LSB (upper or lower side band) and vary the clarifier knob until the sound becomes intelligible. If the sound does not become clear, try the other side band and repeat varying the clarifier knob.

Conversely, if you are in USB or LSB mode and there is a transmission on AM or FM, it will have the same garbled sound. Try changing the mode to AM and the FM. If it does not become clear, it is likely a SSB transmission and you are not on the exact same frequency of the transmission you are hearing. Vary the clarifier knob until it becomes clear - or change to the other side band if needed and try the clairfier again.

The short story is that you must be in the same mode and on the same exact frequency. When in AM or FM, this is less of a problem as these are much more wide banded signals than SSB signals.

The 2990 is really a 50 watt 10 meter amateur radio - but is geared to CBer's as it is easily modified to work in the CB frequency range and the so called "free band" between USA's CB (11 meters) and worldwide amateur 10 meter bands. Be careful transmitting this radio on CB frequencies as it violates FCC rules for power output there - and transmitting in the 28MHz - 29.7MHz requires a valid amateur radio license. Fifty watts on ham frequencies is tiny compared to the 1500 watts permitted. Why not get your ham license (here's how) and leave the "Chicken Band" (and all it entails) behind. You won't miss it!

I hope this helps and good luck!

Apr 12, 2012 | Cobra CB Radios

1 Answer

How to use ssb usb am cb radio


  • Well, AM is Amplitude Modulation and Sideband suppresses the carrier and uses only the top half (upper sideband) or lower half (lower sideband) of the wave.

  • Whether using AM, USB or LSB you are on the same frequency although if someone is on USB and you are on LSB you will not be able to understand what the other person is saying because you are using different parts of the wave. So 27.185 (channel 19) on AM, USB or LSB is still 27.185.

  • If you have further questions please let me know.

  • If you have any comments please feel free to leave them here.
  • Hope this helps and thank you for using FixYa.
Regards,
Tony

Oct 01, 2011 | Galaxy Radios DX-959 40-Channels Base CB...

1 Answer

Not keying up after chanel34 when if it is on high tone and neddel is not going to 30db on usb or lsb it is cobra 148gtl dx


It sounds like the radio may need to be fully aligned. Sounds like its not adjusted to transmit properly in the correct frequency range.

has any one attempted to broadband this radio? if so it could have been done wrong.

I could tell you the alignment procedure but you would need a watt meter, oscilloscope, and a volt meter.

As well its an in depth procedure. So some electronic experience is necessary.

Please let me know if you have the equipment to do the alignment and I will get you the info. If not you best bet is to take it to a radio shop, or send it to a repair shop. If you are going to send it I recommend http://www.sparkyscbshack.com/Home.html

Feb 23, 2010 | CB Radios

1 Answer

How do u adjust the frequency readout on a dx55v?


This radio has three modes, USB, LSB and AM. Each one has a voltage adjustment to center the frequency and they look like metal cans. You do need a analyzer to make this adjustment or at the very least a known frequency standard. Temperature can affect this display.

Feb 11, 2010 | Galaxy Radios DX-55V Base CB Radio

1 Answer

How do i find the FM frequency for a Connex CX-4300-300 CB radio?


FM is just a form of modulation, not an actual frequency. The frequency doesn't change between any of the modes (LSB, USB, AM, FM, CW).

For example, if you are on channel 19 (27.185MHz) on AM (Amplitude Modulation,) switching to FM (Frequency Modulation) mode you would still be at 27.185MHz, but using a different form of modulation.

Nov 10, 2009 | Connex CX-4300HP CB Radio

2 Answers

Connex 3300 hp


U mean on sideband? Frequency counter only useful on other than sideband operation. This does not mean the carrier insertion osc. is on frequency. If it needs adjustment, your voice will sound high/ low on transmit. Incoming signals will sound right after adjusting the osc.

May 14, 2008 | Connex 3300 240-Channels Base CB Radio

1 Answer

SSB ALIGNMENT


You'll need to connect Frequency Counter to C252 & adjust:

USB Frequency: 10.6975Mhz adjust L126 in receive mode
LSB Frequency: 10.6925Mhz adjust L127 in receive mode

May 04, 2008 | Magnum DeltaForce CB Radio

1 Answer

Operator/instruction manual


ghilger, First off, has your radio been converted to open up all the other channels(including CB)?? That has to be done first, or it's locked in the ham freq's. I think the factory manual is pretty well detailed, but i've been around radios my whole life. The mode button does the changing from am/fm/usb/lsb.Here's from the manual;

MODE: Operating Mode. Press the MODE control to select the operating mode. The operating mode is indicated on the liquid crystal display: am, fm, usb, or lsb.
* See, there is 2 different functions for each button. One set of functions are by just pushing the buttons, the other set of functions are obtained by pushing the function button first. The function button is activated by pushing in on the clarifier knob.
*Here is for saving of freq's;

Memory Save. To save in memory a specific
frequency and operating mode, select the desired mode and rotate the FREQUENCY control to the desired frequency. Press the FUNC button, and then press the M.SAVE button. S will appear on the LCD next to the frequency. While S is displayed, immediately press any of the memory channel buttons (1 - 5). The mode and frequency is now saved into memory. If the S indicator disappears before you press the memory channel button,
the information will not be saved and the process
must be repeated.

M.LOAD: Memory(Recall). To recall, any of the saved memory channels press the M.LOAD
button. L will appear on the LCD for several seconds. While the letter is displayed press the desired memory channel button (1 - 5). The programmed mode and frequency will be displayed.,
If you have any more questions about the radio, repost them here and I'll try to walk you thru them. The radio is a very good ssb rig, especially set up with a power mic. Hope this helps,, Mechanic

Feb 03, 2008 | Magnum 257 CB Radio

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