Kt-8900r Manual
Marlys Stotesberry
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A very specific issue this one. I bought one of these radios on an impulse because it was cheap but never really used it. Now, during lockdown my club has a nightly net on 2m so I built an antenna and started using it.The reception was patchy at best on all but the closest people with faint reception and a lot of static.Then I nudged the power button and it cleared up instantly, crystal audio and very low static. The power button is a momentary switch that switches on and off with a long press but I cannot find out in the manual what the short press is and if I there is a setting in the menu that will fix this.
I find the notion that the radio has a function associated with the power button, not mentioned in the manual, that clears up the reception to be very unlikely. If there were a function that improves reception for weak signals, then the manual would surely emphasize it for marketing purposes. I also find the notion of the power button having a secondary function to be unlikely, unless the radio is so crammed with functions that there is no other button to hold the function. Putting multiple functions on the power button is bad design; hold the button too long, and the radio switches off, which would annoy operators.
I'm just guessing here, but I think that there's an intermittent connection somewhere in your setup, and pressing the button fixes the intermittent connection temporarily. I suppose that it's possible that the bad connection is in your PL-259 coaxial connector, especially if you soldered it yourself and you don't have much practice soldering PL-259s, but that seems unlikely because pressing one place on the front panel would be unlikely to flex the connection between the coaxial cable and the connector.
The most likely explanation seems to me to be an intermittent connection inside the radio. The problem could be a cracked surface-mount component, a corroded connector pin, a poor solder joint, etc. Good quality control can prevent such defects from leaving the factory, but QYT seems to be a company that is new to making radios, and their reputation for quality control seems to be mostly unknown. You could try pushing on the front panel near the power button. If that improves the reception, then that would support the intermittent-connection theory.
I had the same problem, and found that the noise was due to electric meter telemetry. Our neighborhood is awash in this. It is regular, and it disappears on its own in about the same time to give the power button a meaningless quick push! Rather than push the power button for momentary relief, I 'found' that switching the channel and returning it 'did the trick'! But, alas, I think it was my imagination and not flipping the channel selector back and forth that was eliminating the static. A better radio with front end bandpass filter won't suffer this issue. The QYT lets anything in. I can transmit much farther than I can receive, and the noise floor rises considerably coming up to Interstate speed. With the squelch off, this is very noticeable.
I gave it one more connect try and BOOM it worked!!! Supposedly this feature is common with cheap Chinese radios, and may have thwarted my attempts in the past to get these rigs running. I had focused mostly on audio issues (which are still important) but did not solve my issue.
So since there is no documentation or forum mention of this, I wanted to get it out there, that this was the key to my success in getting this little cheap rig to work. I have much to do to test this out in the field, but this was a promising sign. Would love to hear from others about this rig specifically (those that have successfully used them, not the naysayers of these spatter prone products) or other inexpensive rigs.
Its been so long ago, I have just stopped with Winlink for the moment. My DigiRig is working fine, while using my Echolink program. It receives and transmits properly. I think the problem May possibly lie with the Winlink & VaraFM programs? Or it may have been the wiring rig, I was trying to make up for use with my QYT radios?
I am having success with having it plugged into the spk/mic jack. I have my Digirig inline with a QYT 8900D & an EVOLVE III (jankapotomus) laptop running an APRS digipeater/iGate here at the QTH 24/7. I am using the APBK-Gate software which is just pretty much a simple usage of Direwolf. I also have it working on Winlink Packet & VARA FM. For the packet modem I use SoundModem for windows. I already had the software configurations working with a different radio so all I had trouble with was figuring out the pin out to build a cable turning off Squelch tail eliminators in the radio helped too.
I used the pinout listed in the owners manual. There is another topic on this site discussing this. I commented on there in more detail about the pinout used. There was an original post on that thread that I followed which matched what the owners manual stated. There was another fellow that had to switch the audio wires, but mine matched the original post I believe which also follows what QYT listed in the manual. However, there may not be much quality control on this radio for that particular 3.5mm jack since it will function even if they switch the wiring. Just up to the user to have to figure out if utilizing the port.
Gracias por adquirir este radio mvil tribanda. Es nico por su cuerpo compacto, salida potente y diseo de rango de frecuencia tribanda. Tambin est diseado con un men de operacin nuevo y personalizado para brindarle una experiencia de operacin excepcional y fcil de usar. Creemos que su tamao mini y el precio rentable satisfarn bien su demanda. Antes de la operacin y para obtener el mejor rendimiento, le recomendamos que lea atentamente este manual de usuario para familiarizarse con las funciones y usos.
Bienvenido a usar nuestra radio mvil KT-8900R, antes de la operacin, se recomienda que:
- Por favor, compruebe que el paquete est en buenas condiciones sin ningn dao.
- Desembale la caja del paquete con cuidado y verifique que todos los elementos estn incluidos.
- Si encuentra que falta algn artculo o que se ha daado durante el envo, comunquese con su distribuidor de inmediato.
El cdigo PTT-ID est preprogramado por software de PC.
- Consulte el men 20 para seleccionar la sealizacin deseada. Presione la tecla [F] + la tecla [2] + la tecla [0] + la tecla [F] + la tecla [ARRIBA] (ABAJO) para seleccionar la sealizacin deseada + la tecla [F] para guardar la configuracin.Consulte el men 22 para configurar el tiempo de transmisin de PTT. Presione la tecla [F] + la tecla [2] + la tecla [2] + la tecla [F] + la tecla [ARRIBA](ABAJO) para seleccionar el tiempo de transmisin de PTT-ID + la tecla [F] para guardar la configuracin.Consulte el men 23 para seleccionar el tiempo de retardo de transmisin PTT. Presione la tecla [F] + tecla [2] + tecla [3] + tecla [F] + tecla [ARRIBA] (ABAJO) para seleccionar el tiempo de retardo deseado + tecla [F] para guardar la configuracin.Presione [PTT] para enviar el cdigo de ID programado.
Esta radio es capaz de codificar/decodificar DTMF, los usuarios pueden programar el cdigo DTMF deseado por programa de PC.Sealizacin DTMFSi la radio est preprogramada con un cdigo de sealizacin DTMF, cuando reciba un cdigo coincidente, alertar y mostrar el cdigo correspondiente; tambin las radios pueden comunicarse entre s en momentos no vlidos. (El cdigo de identificacin es programable por software de PC)Funcin de patrullaAl recibir la sealizacin DTMF coincidente, que es la misma que el cdigo de vigilancia preprogramado, la radio emitir un cdigo de autoidentificacin que se mostrar en la radio de control principal. Esta funcin puede seleccionar ser o no controlada por el cdigo de identificacin maestro, esta funcin no est controlada por la sealizacin RX. (El cdigo de patrulla es programable por software de PC) c80f0f1006