I hope they will be on different channels ! Have you heard of feedback and bleed ?W5PKY wrote:I was looking at going with the UV-5R radio from Baofeng which I believe takes a 3.3V signal for PTT. Planning on going with a duplex setup (so two HT's).
A repeater's input is always a different frequency than the output depends on the band though. For example, If a repeater broadcasts on 147.020MHz, it receives on 147.620MHz. The radios using it transmit on 147.620MHz and receive on 147.020MHz. On the 2m band in the US, the standard offset is 600kHz above the repeater's transmit frequency (or your receiving frequency) for frequencies above 147.000MHz, -600kHz for frequencies below 147.000MHz. Of course, most radios do these offsets automatically now so the operator never really has to think about it...it just works. Of course if it were a simplex repeater, then it would listen, record, transmit recorded info.jamiesk wrote:I hope they will be on different channels ! Have you heard of feedback and bleed ?W5PKY wrote:I was looking at going with the UV-5R radio from Baofeng which I believe takes a 3.3V signal for PTT. Planning on going with a duplex setup (so two HT's).
Unless I had a Radius with a 10W PA, I'd never turn the power down that low. Especially since nearly all of my GR300's and GR500's have 40W PA's in them (I run them around 35-25W).DoninIA wrote:I would get a couple of Motorola Maxtracs or GM300s with a 16 pin accessory connector.
All the signals you need are on the rear 16 pin connector. COR, PL Detect, PTT, TX Audio and RX Audio.
You could build an interface out of some NPN transistors and a 4049 CMOS chip.
This will buffer the inside world from the outside world.
Get the UHF versions. 5 mhz split is easier to work with than 600 khz.
Plus, UHF duplexers are cheaper than the VHF version.
Also, I would lower the power to around 5 watts.
A repeaters performance is not judged by how far it can transmit, but rather by how well it can receive while full duplexing.
I built a similar project using a parallax basic stamp.
I added a DVR, DTMF decoder and also interfaced a 2x16 display.
Had a lot of fun getting the code right.
This project is what motivated me to go to the RPi.
So far I've put together a NAS file server and APRS IGate.
A repeater controller is on my bucket list.
This will be an excellent opportunity to learn Python skills.
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