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What causes the problem on a MOTOROLA GP-2000 portable radio having a continuous hissing sound from speaker with constant green LED on. Squelch setting is at SQL 3.

SQL set at 3, no amount of re-setting the squelch level can remove the hissing sound and the green LED which is always on.

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  • Contributor
  • 33 Answers

Try to recharge your batteries or replace them!!!Please tell me what you did, if there was a solution by this...then I will review your problem...thnx

Posted on Jun 09, 2014

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Posted on Jan 02, 2017

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  • 5 Answers

SOURCE: How to set squelch on a motorola t73xta7ta7bk 2 way radio

That is a Maratrac, the squelch is adjustable thru a variable resistor on the audio/squelch board within the chassis. It is labeled R1132 SQUELCH, and is located very close to the locking handle. Some models have a metal bracket that holds the interface board, (thats the only board in the chassis that is mounted vertically), if you remove this bracket you can see R1132 alot easier, but do not need to remove the bracket to adjust R1132. Clockwise tightens the squelch. One catch though, for this adjustment to work, the radio must have been programmed with the unmuting/muting setting in the RSS, set to And/Or. It comes from the factory set for Std/Std. And in my 15+ years in the business, I have seen only one programmer that changes this setting. Me. Good Luck.

Posted on Feb 26, 2008

eradiostore
  • 1654 Answers

SOURCE: RPL & TPL tones used in T-5720

The T5720 user manual does not list the TPL codes possible in the radio. However, they are the standard list, with zero being "open squelch" (no code). Here is a link to a Motorola manual which has a list of the PL codes in order on page 43. http://www.thekidshuttle.com/ABC%20Docs/CP100_Manual.pdf

On the T5720, another item to what for is the Qt noise filter. Be certain to set it to zero unless using the T5720 with others of the same model. It can also block transmissions. Here is a link to a user manual for the T5720 http://lib.store.yahoo.net/lib/starbattery/T56XXusersguide.pdf

Posted on Sep 22, 2008

eradiostore
  • 1654 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

eradiostore
  • 1654 Answers

SOURCE: MOTOROLA RADIUS GP900

Unprogrammed channels will have a constant tone. It is possible your radio is unprogrammed. A dead battery tone is only for a moment, and is usually a medium tone then a low tone, sounding somewhat like beeedeeep.

Posted on Dec 08, 2008

Neto
  • 123 Answers

SOURCE: Require Frequencies for CTCSS codes for Motorola GP 2000

check this link at page 21 or see below

CTCSS PRIVACY CODES FREQUENCY CHART (Hz) Code Freq. Code Freq. Code Freq. Code Freq. Code Freq. 1 67.0 9 91.5 17 118.8 25 156.7 33 210.7 2 71.9 10 94.8 18 123.0 26 162.2 34 218.1 3 74.4 11 97.4 19 127.3 27 167.9 35 225.7 4 77.0 12 100.0 20 131.8 28 173.8 36 233.6 5 79.7 13 103.5 21 136.5 29 179.9 37 241.8 6 82.5 14 107.2 22 141.3 30 186.2 38 250.3 7 85.4 15 110.9 23 146.2 31 192.8 8 88.5 16 114.8 24 151.4 32 203.5 * Channel 8,9 and 10 are designated Canadian Marine Frequencies * Channels 8~14 are low-power FRS license free channels Note: Privacy codes can be programmed for use on Channels 1~22 only

Posted on Feb 04, 2010

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1 Answer

MOTOROLA GP-2000


Have you tried a new battery?

Apr 14, 2014 | Motorola Radio Communications

1 Answer

Continuous green light at GP-2000 and hissing sound from speaker


Have you adjusted squelch threshold. Green light indicated signal received with noise, squelch will adjust the threshold so light goes off except when a stronger signal is detected.

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1 Answer

No sound on unit


There are any number of reasons for no sound. I will assume you're using new batteries or fully charged batteries. The simplest reason is that a wire has become disconnected from the speaker. This would make the radio sound the same on as off. To test this see if the radio has a way of turning the squelch off, sometimes a simple push button, sometimes a menu setting, sometimes a dial to adjust the squelch setting. If there is no hissing, sometime very loud so turn your volume down first, then either the audio output amp is dead or a wire to the speaker is broken or disconnected. I today's radios the audio amp is most likely a simple small IC but, it could be inside an all-in-one chip and if it's proprietary getting the chip could be a problem. If it's a simple audio chip you'll have to find a replacement or rig up another audio amp IC to work as a replacement. Let's hope for the simple broken or disconnected wire which should be easy enough to fix.

Now, if when you remove the squelch you hear the hissing but you still cannot hear transmitting from your other radio, it could be that the one transmitting is in fact NOT transmitting an not that the other radio cannot hear. You have checked that both radios can or can not hear someone else's radio right?

Assuming you do know that one radio cannot hear what the other can and make no sound other than hissing when the squelch is off the problem is either in the RF or IF sections of the radio's receiver. In general this used to be a more complex repair so let's go another easy fix by going to the very first place the RF comes in, the antenna.

Just like the audio section when a speaker wire is disconnected sometimes the wire or trace going to the bottom of the antenna can become disconnected or broken. To check this bring a good transmitting radio very close to the one that hisses but does not hear the transmitting radio and see if any place as close as you can get the two radios causes the non-hearing radio to hear the transmitting radio. If so, then look for a problem with the antenna connection.

If none of these easy things bring the problem to heel then there's probably something amiss in the RF or IF receiver sections. If the radio has one or two chips that do all the work here then see if you can get both and replace them. I haven't even taken apart my own small FRS radios to see how complex the receivers are in these so I won't go any further than that since I simply don't know your radio.

I hope that helps.

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2 Answers

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Check your squelch level first try to adjust it, if this didnt fix the problem, re solder or replace your filters, the semi rectangular (color black) "TOKO A55, B55 those filters are covered by a rubber

Feb 18, 2011 | Motorola Radio Communications

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I have a motorola AP-300 which keeps on blinking amber light when i turn it on. how can i reset it or what's wrong with the AP?


From the installation guide for this AP, I find the following:

LED Indicators

The unit has LED activity indicators on the front of the case provide a status display indicating error conditions, transmission, and network activity for the 802.11a (amber) radio or the 802.11b/g (green) radio.


802.11a Activity LED Amber

The amber LED flashes three times per second until firmware is loaded. During boot, 802.11a mobiles cannot associate. After adoption, the amber LED is steady or flashes with 802.11a radio traffic.

The amber LED flashes once per second if an error prevents the 802.11a radio from operating normally.


802.11b/g Activity LED Green

The green LED flashes three times per second until firmware is loaded. During boot, 802.11b/g mobiles cannot associate. After adoption, the green LED is steady or flashes with 802.11b/g radio traffic.

The green LED flashes once per second if an error prevents the 802.11b/g radio from operating normally.


From this, it appears that the 802.11A radio is malfunctioning.


Here is the Motorola support web page for this device.

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1 Answer

How do I use a cloning cable to program a hand held MT1000


Cloning Procedure:
(The content of radio A is to be duplicated into radio B)
1. Turn off radio A and turn on radio B.
2. Connect the cloning cable (NKN6376A) to the Universal Connector of both radio A and radio B.
3. Place the PL switch on radio A to the carrier squelch position for full cloning, or the PL position for partial cloning. Full cloning will duplicate the content of radio A to radio B, except for the deviation and squelch settings. Partial cloning is recommended due to deviation variations from radio to radio. (Later version MT1000's (B model for 6, 16, and 99 channel portables; A model for 8 channel) have partial cloning.)
4. Simultaneously depress the PTT and Monitor button on radio A and hold.
5. Turn on radio A. The green LED turns off. Release the PTT and the Monitor button on radio A (HT600's and older MT1000's (A model for 16 and 99 channel portables) beep when cloning is complete). Turn radios "off and on" to reset.
6. Cloning is complete once the green LED turns off. Release both the PTT and Monitor button on radio A. Turn radio A off and on to reset.

NOTE:
For MDC front covers (NTN5456, NTN5457, NTN5458, NTN5459, and NTN6009B), make sure that radio B is turned on before it is connected to the cloning cable.

NOTE:
All VHF wideband radios (146-174MHz) are "C" model radios. A "C" model radio can be cloned only to/from another "C" model radio. An attempt to clone a "C" model radio to an "A" or "B" model radio will result in an unsuccessful cloning attempt.
Any unsuccessful cloning attempt (depending on operating condition of the radio) will result in one of the following alerts:
1. in receive (rotary radio) - 1600Hz continuous alert tone
2. in receive (display radios) - 88 displayed on LCD
3. in transmit - 1600Hz beeping alert tone

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1 Answer

MOTOROLA RADIUS GP900


Unprogrammed channels will have a constant tone. It is possible your radio is unprogrammed. A dead battery tone is only for a moment, and is usually a medium tone then a low tone, sounding somewhat like beeedeeep.

Dec 06, 2008 | Radio Communications

1 Answer

My Binatone Marina 300 Walkie talkies give hiss & noise. Pressing menue and up or menu alone makes no difference. How can I have a quiet radio except when called?


Hello andy300,

Does the "RX" indicator show on the LCD screen constantly?

This radio does have a monitor function which disables the squelch control, allowing the user to listen to weak signals on the channel. Enabling this function in absence of any signals will cause the user to hear any background static or noise on the channel. You enable this function by pressing Menu + Up at the same time and disable the function by pressing Menu.

I assume that you are familiar with this function from the fact that you mention these keystrokes have no affect on the radio's behavior.

It is possible that the area you are using the radios in / channel you are using them on has a very high noise level. If the noise level is higher then the radio's automatic squelch threshold, then you would hear constant static, hiss, or white noise and the receive ("RX") indicator would show a constant signal. A local noise level can be caused by atmospheric conditions or very busy nearby adjacent-channel radio signals.

Try operating the radios on a different channel and see if that helps. If it is practical, you might try operating the radios in a different local area just to see if that has any effect at all. This would help you determine if the problem was a local one specific to the area you are operating in.

If it is local area related you might consider switching to a different model of radio that includes a Continuous Coded Squelch System (CTCSS) function (called "privacy codes" or "quiet tones" by come manufacturers. This function does not appear to be included in the model you are using and can help keep your radios silent unless you receive a call from another radio using the exact same privacy code.

If the problem persists regardless of channel or area, then you might have a problem with the radio that would require factory service.

Hope this helps. Best regards!
Ken
Go Ahead. Use Us.

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