T8500 blinks off and back on often when transmitting
These radios have proven to be very unreliable. I have a set of three and two of them often will not transmit a signal. They blink off then right back on when you ptt. Is this a common issue and does anyone have a solution. If i can't fix the problem and need new radios, do you have a recomendation? I primarily use them for backcountry skiing and snowmobiling so I need reliable long range capabilty. Thanks
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Re: T8500 blinks off and back on often when transmitting
It takes more energy to transmit than to receive. It is possible you have an old or defective battery pack, a bad connection to the battery, or your PTT button is not working properly. On this unit, the internal PTT button can begin to be bent further in from repeated use, or pressing too firmly.
As far as a more durable/reliable radio, you might want to look at radios in the business division such as the Motorola CP110, BPR40 or the CP150. These business level radios are built to work a 40+ hour work week, and are much more reliable than the consumer division products, which are intended for occasional usage.
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The turn signals on new fords have two settings: three blinks, and continuous blinks. Small movement will set three blinks. Full movement will turn on continuous blinks. Please check, and if still bad you will need to see a mechanic.
A blinking red light can be a sign of the radio picking up radio frequency waves (RF) on your same frequency or a nearby frequency. There may something transmitting in your area which is causing the blinking light, or you may have another radio which could be stuck in transmit. One way to check this is to take the radio to a different location and see if the blinking still occurs.
Next, the question would be, does the radio function otherwise correctly? If so, continue to use the radio and do not concern yourself with the light. If the radio does not function properly, they you should send it to a qualified radio repair center for service.
You have to press the transmit button to get the radio to send a signal that you can calibrate the SWR meter to. If you are pressing the transmit button and nothing is happening then it could be a blown final transistor, a bad switch, bad microphone connection etc.
Here are a couple of things to try before trashing the unit:
1) Check your programming to see that your frequency, code and Qt filter (if any) match identically. For simple operation set your Qt filter and code to off (zero).
2) Swap the batteries between the two units, see if the problem moves to the other unit. If so, you have a bad battery pack.
FIXED/OFF/+10KHz SWITCH: The left position puts the radio on
one of the three fixed channels that is selected by the channel switch
(6,19, or 21). This over-rides the channel selected by the 40 channel
knob. The right position adds 10KHz to whatever frequency you are ON.
In the middle, both features are OFF.
Otherwise, a radio tech would be able to retune the frequency inside the radio.
After adding 10KHz to your frequency, use the SWR control to check the SWR of your antenna.
SWR CAL CONTROL: Normally this switch is set to “PO”. Then,
during transmission, the meter indicates output power. To read SWR,
rotate this knob during transmission until the needle moves to the “SET”
point on the SWR scale. Then, while still transmitting, set the R.B./SWR
switch to SWR.
Ideal SWR is 1 but you'll want to be as near one as possible. An SWR of 1.6 or greater will make ineffective use of your antenna.
If in doubt, a radio tech has the required meters and tools to adjust the SWR/Tuning of your antenna.
You may have the CTCSS privacy code function enabled on one radio and not on the other. This function keeps your radio's received muted unless it receives a signal from another radio using the same privacy code. If you have Privacy Codes set for radio A but not for radio B you will still be able to transmit from A to B but when you transmit on radio B your signal will not be heard on radio A.
Make sure that both radios are set to the same privacy code or that the function is turned off on both radios.
Check the squelch on your radio thats not recieving. If there is a monitor button ( when pushed you will hear static) try pushing it.. then get someone to call you so you can check if you can hear them.
On these radios you have 2 types of squelch....1 is called carrier squelch.... it basically opens when there is a strong enough signal. This lets you only hear strong signals and "squelch out" the distant ones and background static.
The2nd. is "tone squelch" ... with your radio they are often called privacy tones. If you have 2 radios set with the same privacy tones you will only be able to hear each other... only radios that are transmitting with that privacy tone will be heard on your radio. Its a high frequency tone that can't be hear by the human ear that gets "embeded" with the transmitting signal. The recieving radio hears it and opens the squelch.
So... if the radio thats rxing (recieving)your signal has its squelch set for just carrier squelch it will hear any signal thats strong enough to break the squech open.... basicaly any radio within a certain range. But if your radio (one with problem) has its squelch set for privacy tones you will not hear any other radios except the ones set with the same privacy tone.... the squelch will not open until it gets a tx signal with the right tone.... so if the txing (transmitting) radio is not using tone squelch but is using carrier squelch.... and the rxing radio is set for tone squelch... the rxing radio will not hear it.
With tone (privacy tones/codes) squelch you need a tone to open the squelch and then the audio can be heard... with carrier squelch the squelch will open if ANY radio is within a certain range.
Check the squelch setting on the problem radio... it could have a privacy tone set. Try pushing in the monitor button so you can hear static ( you want to hear everything including static) on both radios... tx on one radio at a time and listen if it can be heard on the other with the monitor button pushed.
If you can't hear any audio when the broken one is transmitting then it COULD be the mic.... if you can hear both radios with the monitor button activated than the radios are txing and have tx audio and are working... if thats the case its the privacy tones that are the problem.