blimey what a set up// lets radiate the cat with the antenna whic seems to have no ground planes. Looked at the BTECH website. they say use 2 BTECH radios. Hmmmm these seem to be modded radios as they have pins 2 and 8 in use. and they have edited the picture shown.. There is usually no audio at the mic socket and this has been a problem with people buying the BT-89 wireless speaker mics. The BETECH web page states to keep both antennas far apart as possible. so no diplexer in use,
This doesn't work with unmodified radios. audio out and COS (COR) lines need to be run to the unused pins on the mic jack. Then a "cross-over" type cable will work. Also a duplexer is not used here...it would actually be called a diplexer due to the cross band use here.
Hi sir, i have 2 unit of qyt 8900d..like to make a repeater like u did.. In ur setup.. Do you using single power supplly to power both radio unit.. Or each has its own power supply..?? Since we going to connect both unit.. Im worried the could be a short circuit..
Can we use qyt 980plus as repeater same like this way? And if we use antenna seperate antenna for radios then is there minimum distance between transmitter and receiver??
This setup i am using duplexer. I don't have experience using 2 antenna, but my friend build repeater using 2 antenna. For receiving using half wave and for transmit using 5/8 using 1 pole 15ft distance. Transmit on the top of pole, just this information i got for u from my friend. For qyt980plus maybe u can try, i hope this model have mode "repeater -M"
One more thing, this setup for cross band. But if you want repeating same band vhf or uhf, you just add duplexer or transmit and receive antenna must far. According my setup transmit antenna below 15ft from receive antenna. Receive on the top, transmit 15ft lower from receive antenna.
Now if I could just get someone to fabricate a cable that would do a UV5R receive radio to the rj45 kt9800 transmit I'd be rocking but I guess i'll just order another kt8900.....
friend, I have a doubt, pin 1 and pin 7 do not connect?, because I am having problems, after a while of use, both radios change frequency, unlock and it is as if someone was manipulating the microphone, then I came to the conclusion that I connect pin 1 and pin 7, so I must cut them?
Question. If I buy 2 qyt mobile radios and put them together with the RJ45 cable. Run 2 antennas far apart. Does this mean I do not need a duplexer and that I can use the same frequency band for RX and TX?
Pins 7 and 1 in the diagram are not used ?, or pin 7 is connected with 7 and pin 1 with 1 ?. You could help me solve it, in your video I can not understand it.
thanks,hope u can show us a video that about antenna,in duplexer and connecting 2 antenna tx ,rx with this project..it's helps alot to me ,cause needed to workout my teammates for community policing.
@@enzopulido2579 around 15km away tested. if put the antenna more heigh, n you get more coverage. i am using 1 power supply for 2 radio. 1 more think....u need modifide heatsink on this model to keep final transistor won't over heat....becuse the final transistor not contact with body.
So if I buy 2 qyt radios to make a repeater. And I purchase a duplexer and have it tuned. Do I really need the RJ45 connector connected to both radios?
This works but not as shown here. The cable is correct. You do not need a duplexer on cross band (2m/440). you do need 2 antenna's . This video will not help you. He does not explain the settings in the radio needed to make it go. And the comment that audio is not on the mic jack from a poster below does not know this radio. I have the KT8900r's and works fine on them. KT 8900 also works. baofengtech.com/pdf/X-Band-Repeater-BTECH-Mobile.pdf If this does not help then your doing some thing wrong .
Hello; except the cable rj45 whether it is necessary to connect something else or is it just rj45 enough that two radio devices are working as a repeater? 73 9a7psj
Opa amigo boa tarde aqui Robson vc conseguiu fazer o esquema do cara eu queria saber depois de fabricar o cabo que ele encima tem que configurar o rádio também algo ou só por a frequência desejada e pronto muito obrigado dês de já
just using Collinear Coaxial Antenna home made.....this setup need a duplexer. without duplexer you need 2 antenna for RX and TX must farway between 2 antenna..
I tried the utp cable config but its not working on my 2 qyt. i think you need to mod the qyt 8900 external audio so you can connect from there to trigger the other repeaters transmit
You are right... sort of, I had the exact cable made up and connected everything, however the PINOUT on the QYT KT8900 is NOT as described in the diagram
Enter MENU 43 REP-M and select CTDCS for two mobiles - this will require the repeater forwarding (X-Band Repeat) to activate once the confirmed PL signal (CTCSS or DCS) is received will transmit it on.
Hi all, I could not make the radio work in transmission. I think that other functions must be activated. Contacts are like the RJ45 scheme. my best regards. Save
On your video ,both 8900 was on UHF Band,while your linking cable diagram is for cross band repeater system.Your video testing is confusing,,your RX radio is on 446.102 and TX is 456.102,your demo shows using your portable that you transmitted on 456.02,therefore ,both 8900 should work or base on your video the RX radio on top should indicate that it recieves your transmition, very confusing
OK, so this is a bit misleading, first of all the PINOUT on the KYT is completely different then what you have posted here. PIN 2 and 8 are both empty. Also you mentioned in the comments you use a duplexer... with a duplexer you would not need this cable, simply connect Radio 1 and Radio 2 to each side of duplexer and boom! Done! Save your self some time and money people, the Baofeng UV5R with the little repeater thing works way better then this.
Duplexers are for separating VHF from UHF and only have antenna connections, a duplexer will not bridge the audio, COS, and PTT between radios. You are right about the pinout, the radios must have been modified for COS and audio out on the un-used pins.
