Batboard

Hello :
I think i got the basic understanding about the Maxtracs 900mhz hear clear.
What im wondering is this.
Can i take a hear clear front off of a 900mhz maxtrac and put it on say a UHF maxtrac and would it work as xpand type opertation .
I realize id have to do this with another uhf to be able to use it.
Reason im wondering is if it actualy helps 900 mhz maxtracs clear up for audio - then wouldnt it help a uhf maxtrac sound better further out ?
Pros and Cons ???
Lay it on me - Im interested in all opinions and things i didnt think of as to the good and bad effecets this might have.
Thank you
Satelite

It probably won't help as much on 450 MHz as it does on 900 MHz.

900 is narrow-band (2.5 kHz deviation) so there's less audio and more noise to contend with. H/C gets rid of a lot of the noise and concentrates the audio by strongly filtering it to the 300-3000 Hz range.

Since the wavelength is shorter, the signal strength varies at a much faster rate as things move, so picket-fencing is more noticeable. H/C helps get rid of a lot of this. Even if you are standing still, antennas still move, and an inch, being quite a percentage of the final wavelength, does make a difference.

900 MHz MSF5000 stations have a circuit called a "flutter-fighter" which is probably similar to H/C in function.

The 900 MHz logic board can control H/C; the other logic boards can not. Yes, you could manually and permanently enable H/C on the control head, but you'd also need to feed 9.6VDC up to it and make sure the audio levels are appropriate.

Some radios may have a setting called "compander on/off" which would help a bit, just like H/C does. Some Spectras have that, but I don't know if it's limited to 900 MHz or not.

All of our user radios have it enabled on our 900 MHz repeaters out here. None of the repeaters do; they just pass whatever comes through.

If I told you it could NOT be done, you'd go do it anyway just to prove me wrong. Whether or not you'd be successful, blow something up, or get satisfactory results, is another matter.

Bob M.