Welcome to Retevis Support
We’re here to help.
1  I am looking for a Battery Eliminator (12v) for the RT81. Which is the correct one ?
Hello Lawrence Williams, This is RT81 original Eliminator link:http://www.retevis.com/original-12-24v-car-charger-battery-eliminator-for-retevis-rt8 Brgds
2  I am looking at the RT81 radio as a future purchase. Can you tell me if there is a 14" or longer antenna that will work with this radio? Will any of the ones below work? Also, do you sell a case that will fit the radio? Thank you. UHF 400-480 MHz Long 14.17in SMA-M Antenna for Retevis RT1 RT8 SKU: J9106D SMA-M Elite Antenna U/V Antenna For Retevis RT1/RT2/RT3 SKU: C9030M Long 36cm Dual Band SMA-M Antenna for Retevis SKU: J9107D
Hello Mike, J9106D,C9030M,J9107D, they are compatible with RT81,so you can choose one from them, thanks Brgds
3  How do i make a model RT81 go onto the same frequency as a model RT1 to be used together?
Dear Here's a blog for you reference, please follow steps to programme them http://blog.retevis.com/retevis-rt3-communicate-with-h777/ Best regards
4  Hi! How i can reset(without cable) RT81 to default factory settings ? Best regards
Dear Sergey, you need open the default factory settings by RT81 programming cable C9018A: http://www.retevis.com/2-pin-programming-cable-for-retevis-h777 Best regards
5  Нужна инструкция для RT 81 на русском языке, заранее спасибо!
Уважаемые RT81 не имеет руководства для России, сейчас доступно только английское руководство С наилучшими пожеланиями
6  Hello, Here I bought the RetevisRT81 in October 2016 or I noticed that it was not compatible tier2, it pulls on the 2 slot at the same time. Retevis ma say that a firmware update was planned for the beginning of 2017, that is my question or in es this firmware that fixes this bug Thank you for answering me Receive my greetings
It is still in processing . Hard to tell which part to fix this bug .
7  Good evening... My rt81 use both 2 slots ... it is possible? When I transmitting in slot 2 (for example) the radio use slot 1 and 2 ... Firmware problem?? Thanks. Kris
There is only slot 1 available to use for now .
8  Hello there, is it possible to adjust the TX-Power for example to 2,5 W to get common with local/national law? best regards Mario
RT81 only have two levels power , low as 5W ,high as 10W.
9  what program do you use for rt81
Do you mean software ? If so , here to download --- http://www.retevis.com/resources-center/