Home User Tutorial How to make H777 communicate with RT21?

How to make H777 communicate with RT21?

by Lisa Zhao

RT21 and H777  are  analog radios. To make H777 communicate with RT21  is very easy:

Just to set the RX and TX frequencies and the CTSCC/DCS (  same as QT/DQT) the same .


Please operate the followings  step by step:


1, you need a programming cable for the two radios.

2, you need the software of the two radio. ( we will send the software in a separately e-mail).

You can find the programming cable here ( the two radio can use the same one) :

here is the link: https://www.retevis.com/2-pin-programming-cable-for-retevis-h777#C9018AX1

About how to install the software,here is the blog:https://www.twowayradiocommunity.com/how-to-programme-h777


Now we start to set the  frequency and QT/DQT (also name as CTCSS/DCS)  of H777.

1.For example: channel 1: Rx  Freq:462.56250 Tx Freq:462.56250  QT/DQT: 67   QT/DQT Enc: 67

channel 2: Rx Freq: 462.58750  Tx Freq: 462.58750  QT/DQT: 69.3   QT/DQT Enc: 69.3

2.Then same as H777, you can install the RT21 software: QT/DQT (also name as CTCSS/DCS)

3, Remember to Click” Read from Radio” in “Program” Column, then write the frequency, after program , save the data to the radio. Then the H777 can communicate with RT21.
If you have any questions when program, you can contact us by e-mail: lisa@retevis.com
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