Question about Two-Way Radios

1 Answer

GP238 with Microphonics

The Rx audio circuit is working on TX. speakers mics are stopping the radio from transmitting and without the speaker mic , depress the ptt switch and tap on the case and the tapping noise comes out of the speaker . Several radiop are doing this , i changed the crystal filters and stil the same thing

Allen

Posted by on

  • proff 128
    proff 128 Mar 23, 2009

    No replays
    every thing is SMD

×

1 Answer

  • Level 2:

    An expert who has achieved level 2 by getting 100 points

    MVP:

    An expert that gotĀ 5 achievements.

    Governor:

    An expert whose answer gotĀ voted for 20 times.

    Hot-Shot:

    An expert who has answered 20 questions.

  • Expert
  • 120 Answers

Sounds like a faulty or dirty relay, could be mechanical relays or solid state

Posted on Mar 07, 2009

3 Suggested Answers

Benimur
  • 6966 Answers

SOURCE: cobra 29ltd classic : no rx / tx

Hi,

D23 is the reverse protection diode and it shorting is the primary reason your fuse blew. As you posted, power was applied in reverse, hence other components would also fail. Pls check:
1. D22 - 9.1V Zener Diode
2. TR23 (2SC1096) 9 Volts regulator
3. D19 - 5.1 Zener Diode
4. IC4 (TA7222) - Audio Amp
5. TR14 (2SC2029B/10) - Finals
6. TR15 (2SC2028B/20) - Driver
7. Most capacitors over 220uF (like C123, C114 & C112)

Hope that this be of help/idea. Pls post back how things turned up or should you need additional information.

Good luck and kind regards.

Posted on Feb 04, 2008

eradiostore
  • 1640 Answers

SOURCE: tone squelch

Here is a link to download the user manual for the GP68 http://safemanuals.com/user-guide-instructions-owner-manual/MOTOROLA/GP68%20RADIO%20TRANSMITTER-_E

On your first radio, the one we've been discussing, I believe you have the DPL code set incorrectly. Your radio will go up to the number 126, but this is not the DPL code's number. It is simply a numbering system.

If I read the chart correctly:
DPL 205 equals the number 072.
DPL 023 equals the number 043.

Disclaimer: This numbering system listed in the user guide does not follow any common numbering system. I have other TPL/DPL charts which differ. The above reference is only based on what I have read in the user guide.

I am confident if your radio worked previously at another job site, using other frequencies/PL codes, that your only issue at this time is programming.

As for your unlock issue on the other GP68. Your radio may be in need of repair. The internal button is possibly wornout or has been depressed too far, and is bent on the board beyond the point of functioning.

Posted on Sep 29, 2008

WV6Z
  • 7 Answers

SOURCE: FT-920: When the TUNER switch is pressed, the

Have you tired performing a general reset (see page 92 of your Operator's Manual). If you have tried this and still have had no luck, be sure that you have established a good ground to earth and that you are not getting a lot of RF back into your 920.

If you do not have a manual for your rig, one can be downloaded here http://www.download.n7tgb.net/yaesu/FT920/man_ft-920.pdf

You can also call Yaesu Tech Support for free/additional help at 714-827-7600, or join the Yahoo FT-920 User's Group at http://groups.yahoo.com/group/YaesuFT920/

Hope this helps......

Posted on Jun 26, 2009

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

Yaesu 857D very poor audio out on SSB.


Dbl check your swr in am mode.. Ch your ssb power and mic gain default is 50 on both on hf .. If you use the mh-59 you will need to reduce the mic gain to 35 and it needs to be set for remote mic in the menu. Also the ssb needs to be set 2.5k wide with the ssb carrier zeroed both tx and rx

Apr 29, 2016 | Yaesu FT-857D transceiver

1 Answer

Will transmit but will not receive


I have programmed hundreds of these. The radio may be receiving, but the speaker may be muted. If using a hand mic, have the mic "off hook" or ungrounded and try again. Does the front light flash while the radio is receiving? This indicates the radio is "hearing", just not passing the audio to the speaker. Is there something plugged into the audio jack in the back? Let me know. In 20-30 minutes most shops familiar with Vertex will know exactly what is happening.

Oct 01, 2015 | Vertex Standard VX-2100-G7-45-PKG-1 UHF...

1 Answer

Motorola BPR 40 will transmit,but not receive through the microphone. Works fine as a handheld


You may have one of three problems: Your audio accessory jack is bad, you are using the wrong mic for the radio, or your mic is bad. Try the mic on a known good BPR40 and if it test good, if so, your BPR40 with the problem needs a new audio accessory jack. (Repair is available for this model.) We have found the BPR40 will only work properly with the remote speaker mic designed for it, despite some other Motorola mics appearing to fit the jack. Construction grade mic PMMN4013 is a good option, as is the lightweight PMMN4077.

Jul 08, 2015 | Motorola Two-Way Radios

1 Answer

Volume Issues


A few things which come to mind:

1) Check your settings to be certain you are not mixing wideband and narrowband. Many modern radios have both built in. After Jan. 2013 nearly all radios in the USA were mandated to migrate to narrowband. Mixing the two can cause the exact problem you described.

2) Check your radios' mic and speaker area. Be certain there is nothing covering either and no debris stuck in the holes or grill.

3) You might have a bad speaker on the low volume radio or a bad mic on the transmitting radio. One way to check this is to introduce a known good 3rd radio into the mix.

Best regards.

Mar 11, 2014 | Binatone Action 950 Long Range Two Way...

1 Answer

How to get the mic to work?


Remote Speaker Microphone? or internal mic on the radio, are you not getting Transmit Audio to come thru when you Transmit?

Mar 05, 2014 | Two-Way Radios

1 Answer

Stuck on rx mode


Rx is an abbreviation for receive. (Tx is transmit) There are a variety of reasons a radio will be "stuck" in Rx:
1) Another radio in the group is stuck in transmit and you cannot reply if your radio is receiving the other radios transmission.
2) Your radio is programmed for Rx only.
3) Your radio has a Tx problem such as a bad mic, or something covering the mic opening.
4) Your battery is low or bad. It takes more energy to Tx than to Rx.

Best regards.

Feb 07, 2014 | Cobra LI3900-2DXVP (14 Channels) 2-Way...

2 Answers

Can transmit but not receive, same with or without mic, have tried different mic ...no dice ?


Your radio is in need of repair. Typically you can find flat rate repair for the CP200 style radio for around $85. You may have a bad speaker, or other internal issue.

Best regards.

Jul 14, 2012 | Motorola Mint Radius Cp200 Uhf 4ch Radio

2 Answers

I have two uniden GMR1088-2CK radios, If I press the transmit button on the side and speak into the Mike you can see tx appear in the display, the 2nd unit receives the call, rx appears in the display and...


Hello,

What this code indicate mean that your radio have have been compress with power however the can also be an indication of lower power supply but most of the time is always power compress.

What you need to do to solve this code problem is to put off the radio for some time allow it relax, then remove the battery if possible after some time replace it if you are able to remove the battery then put on the radio and operate it.

Good luck.

Jan 15, 2011 | Two-Way Radios

1 Answer

I have several MU22 series radios. they work


The MU22 will not do what you are attempting to do. You can't put in a control voltage on one end and have it come out on the other. 2-way radios Tx and Rx (communicate) using audio signals. The speaker output and audio input are audio signals, not DC voltages or control voltages.

A radio can be used as a remote control method, however, a conversion needs to be done on both ends. Example: Turning a lamp on, at the Tx end you would have a converter which will take a control signal and convert it to an audio tone. On the Rx end (the lamp) there will be another converter, this converter listens for the correct tone and when it gets the correct tone, it turns on the lamp. This example is what you call tone-remote control, which is one of the most common methods for using 2-way radios for remote control applications.

There are other methods for remote control such as telemetry. Keywords to google would be telemetry and tone remote control.

Best regards.

Oct 08, 2009 | Motorola MU21CV (1 Channel) 2-Way Radio

1 Answer

Poor mic


whats the problem with your radio?
No Transmitted audio = mic cord faulty
Poor Rx / Tx power = poor SWR on the aerial
Dead radio = fuse or power supply faulty or protection diode faulty

Aug 20, 2008 | GE 35840GC3 2-Way Radio

Not finding what you are looking for?
Two-Way Radios Logo

Related Topics:

197 people viewed this question

Ask a Question

Usually answered in minutes!

Top Two-Way Radios Experts

eradiostore
eradiostore

Level 3 Expert

1640 Answers

Iron
Iron

Level 3 Expert

3018 Answers

Steve

Level 3 Expert

3287 Answers

Are you a Two-Way Radio Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...