Cobra 148 GTL 120-Channels Base CB Radio Logo

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Posted on Jan 12, 2011

Which vr adjust squelch control inside radio some one has ben inside making adjustments. squelch is full open with no response from from panel control knob. (static) cobra 148

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  • Posted on Jan 13, 2011
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Ranger PPR-RBT1

Tommy, I know why you like the radio, but I must warn you that it isn't type accepted for the amateur band. (it would be the same thing as using an amateur radio for the fire department or sheriff for emergency uses.) I have looked for the mods to change it into a 10-meter radio, and they are not to be found. My suggestion to you is to look in a recent issue of QST about building a Bluetooth (c) transceiver for your regular 10-meter radio. I had to do the same thing for my HF rig which happens to be a Yaesu FT-857D. Fire me an e-mail if you want the schematics for the box. 73 and good luck!
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How to tune squelch

you need a signal generator that costs more the radio you want turn the squelch up on.If its a one time deal its not worth it.If you intend on repairing radios then you will have a headstart. you need a service manual.the manual will tell you which vr to adjust.
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My Ranger2950 has no sound??

Have a look here for info about the Ranger 2950. This is an Amateur 10 & 12 meter transceiver that enjoy some popularity due to its ability to be modified to work on the 27Mhz Citizens Band.

Make sure the Mode is set to something other than PA. A few of the first things that come to mind is the Volume, Squelch & RF Gain settings. The Volume is straight forward - choose a setting in the middle to begin. Next, set the squelch. Most radios have the squelch open when set fully counter-clockwise. As you move the squelch to this position, sound should be heard from the speaker if a signal is present. As long as there is an antenna connected, the radio should "hear" noise. If you do not hear anything, leave the Squelch fully CCW and try varying the RF Gain fully in one direction. If you still hear nothing, set the Squelch to the fully clock-wise position. Adjust the RF Gain to the opposite direction. At this point, you should have heard something - even if just static hash. If not, the volume control may be dirty. Disconnect power and rotate the volume control back and forth several times to dislodge any dirt on the volume wiper inside the radio, and try again.

Make sure that the Ext Spk jack does not have a plug inserted as it will defeat the internal speaker. Likewise, if using an external speaker, make sure it works.

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How do i adjust the squelch?

Turn the squelch control clockwise just enough to cut the background noise, this should work well for local communication.
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Cobra 1000 gtl no output

does the radio turn on at all ? Do you have it on cb not pa? Is your RF GAIN opened all the way? Squelch turned all the to the left?Volume opened about 1/2 way it should be on .if not go inside radio and look for VR that is beside the modulation transformer and turn it all the way to the right . If you have no power put put then you will have to adjust the power out put coil . you will need the service manual and some equipment to check this out. Its going to get expensive but if you feel as though you can't do it then take it to a tech and let them get the headache.
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How to adjust frequency on transmit??? Galaxy

hELLO THERE
hERE IS SOME MODIFICATIONS FOR THIS RADIO
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Unmarked VR in R189..AM/FM Medium Power for DX 77HML only. DX 33HML, DX 44V, DX 55V, DX 66V, and DX 73V- VR 1....AM/FM S-Meter, VR 4....AM/FM Squelch Range, VR 5.....FM Deviation, VR 8....RF Meter, VR12...Low Power AM Modulation, VR13...AM/FM High Power, VR14...High Power AM Modulation, VR16...AM/FM Low Power.
Unmarked VR in R188..AM/FM Medium Power (DX 33HML only)
Unmarked VR in C139..Med Power AM modulation (DX 33HML only) DX 949,DX 959- VR 1....AM S-Meter, VR 2....SSB S-Meter, VR 3....SSB Squelch Range, VR 4....AM Squelch Range, VR 6.....SSB Carrier Balance, VR 7....TX Offset, VR 9....RF Meter, VR10...Final Bias, VR12...Driver Bias, VR13...SSB ALC, VR14...AM High Power, VR15...AM Modulation Meter, VR16...AM Modulation, VR17...SSB Power, VR18...AM Low Power, VC1....10.240. DX 2517 and DX 2527-
Symptom:Buzzing or motorboating sound in either the transmit or receive.
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RG 66,99,DX2517 Replace Q54 2SB754 60watt 7A with a higher power 2SB817 100 Watt 12A. Derating of this component will cool operation, provide better voltage stability,decrease wobble, allow voltage increase to 14.5 volts comfortably. (replace 10 volt caps in this section of the radio to a minimum of 16 volts before increasing supply voltage to this level)and provide faster swing rise time, Replace Q37 2SA473 to a 2SA1012-0 or ECG153 this will improve the clarity and volume of the modulation and it will also run a lot cooler.

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Yes sir, when u will open the set u can find two potentiometers , one is for tranmitter another for receiver . Try adjusting the same ( second radio should be transmitting ) do not switch one radio without antennae it may burn ..
Regards
raj/
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Squelch doesnt work

Open the component / speaker side cover on the radio, adjust VR3, this is the alignment control for the squelch. Set your squelch control knob on the front of the radio to about 10 o'clock and slowly adjust VR3 until the signal from the speaker is mute.

When you turn the squelch back to the 0 position, you should have signal with no squelch as in normal operation.

Thanks!
Dodgem

http://dodgem250.angelfire.com
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Audio limiter

tintlady, here is the info you requested;
the AM limiter is R 276

These are the variable adjustments inside,and what they control.
VR-1 AM S-METER
VR-2 SSB S-METER
VR-3 SSB SQUELCH RANGE
VR-4 AM SQUELCH RANGE
VR-6 SSB CARRIER BALANCE
VR-7 TX OFFSET
VR-9 RF METER
VR-10 FINAL BIAS
VR-12 DRIVER BIAS
VR-13 SSB ALC
VR-14 AM HIGH POWER
VR-15 AM MODULATION METER
VR-16 AM MODULATION
VR-17 SSB POWER
VR-18 AM LOW POWER
VC1-10.240 MHz Frequency adjustment

Hope this helps you out, let me know,,Mechanic
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Squelch control on Galaxy DX-2547

You may have a bad transistor or detector diode that feeds the squelch circuit.If you can read a volt meter and Ohm Meter, and can solder ( Make your own repairs ) you may want to call Galaxy as the Techs there are normally very helpful.
Good Luck
Ed
NC Electronic
Mills, Wyoming
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