Q1) Can SR-629 also just connect a PMR 446 radio device and use it as a repeater for PMR 446 radios, i.e. to increase the range?
A1) It cannot be used, because the 446 frequency radio upload frequency and download frequency do not exceed 5 MHz.

Q2) is SR-628 compatible for Motorola CM 300 as transmit?
A2) Sorry, we don't have cable for cm300

Q3) Can SR-628 be used with icom 2200. Because I already have icom cable.
A3) Yes, you can use 48-50-S repeater cable

Q4) Why when my radio that transmits 8 watts is hooked up to SR-629, it  retransmit power is only 2 watts ?
A4) The transmission power has nothing to do with the SR 629. The 629 is just a switch to control the reception and transmission. The transmission power is determined by the radio.

Q5) if SR-629 will work on Retevis L51 POC radio?
A5) It can't work with Retevis L51 POC radio

Q6) Surecom SR-112 to respond to DTMF commands.
I have tried different radios, different commands, etc. but the SR-112 does not respond.Please advise.
A6)  Before connecting the repeater cable, please check all the Radio can be communicated.
Then, check the repeater cable is fully plug-in between Radio and SR-112 device
Please also check the volume, too loud or too small will also affect the DTMF

Q7) Used SR-629 having problems. You can only listen to them, but you cannot send them back.I can only receive. When I press send, it doesn't work. I switch between a and b modes and then it doesn't send.
(Use the network as a radio communication as a repeater as per the manual that he told me to do. I can send to the station pair and receive it, but the station pair I can't send back. That is the problem of using the box.)
A7) The SR-629 has two modes:
Mode 1: Radio A can only receive, Radio B can only transmit
Mode 2: Radio A can both receive and transmit, Radio B can both receive and transmit
Please check if device is selected into Mode 2?

Also, we haven't tested the SR-629 for use with an internet radio. If it was purchased from your store, it should have used a 46-K patch cord, right? Since the customer is using an internet radio, we're not sure if the 46-K patch cord actually works with theirs (because we don't know if the earphone connector wiring is the same).

The SR629 is designed for analog radio. It is not compatible with most network or digital intercoms. This is because when an internet intercom is in standby mode after pressing the PTT button, there is no noise current, which activates the 629 switch.
Therefore, most network intercoms cannot be used with the SR629; only analog intercoms can be used.

Q8) Can I use a TRRS to TRS cable from QYT8900 to Surecom sr628?
A8) It can't and we dont have cable for QYT8900