| Author |
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vernonott
| | Posted on Tuesday, July 31, 2001 - 8:22 pm: | 
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One more time gentlemen : I totally understand what a FM repeater does.My question is would there be any benefit to designing a AM repeater? In fact would it even be possible to do so.Many of you forum guys are pretty sharp and usually are well over my head so how about keep your answer in laymans terms.73's |
HAM CBer
| | Posted on Tuesday, July 31, 2001 - 9:07 pm: |
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Sure you can. There are AM repeaters still on the air in the 40MHz range around here for the oil refinery trucks. The problem with doing it on CB is that it is ILLEGAL (had to get that out of the way). The biggest problem is using a PL or DPL tone on AM does not work very well, so the repeater would have to be carrier squelch. This means that every time the static comes up, the repeater would key up.
Now, you could do a simplex repeater and get the same crummy results, so that it out too. |
bruce
| | Posted on Tuesday, July 31, 2001 - 9:31 pm: |
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vernonott beleve it or not there were a few AM repeaters back in the 60's. The AM repeater worked just fine but in mobile service and at weak signal levels FM has a edge over FM. At that time cheep FM radios were comming out of service on the VHF bands and made more sense to convert them rather than the AM rigs of their time. Because of FM's noise limming and the high sens. of the FM recivers of even that day AM simply could not keep up. I remember in the army in the late 60's at Fort Knox i saw my first ham radio repeter the local hams put together and i bought a standard src 146 to be able to use it. After more than 30 years i still have that radio it is sitting in frount of me working right now. Thats it fm rigs were in the right place at the right time! They were small dependible and now cheep. |
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