AFC is disabled per the UHF mobile conversion instructions on repeater-builder.
We just need to take the time to do a full tune-up again. I remember it being quite touchy the first time. I wondered if it was to touchy and that's why it's so far off now. Is it normal for a receiver to loose so much in 2 years? Thanks, Chris ----- Original Message ----- From: "Neil McKie" <[EMAIL PROTECTED]> To: <[email protected]> Sent: Saturday, January 08, 2005 10:43 PM Subject: Re: [Repeater-Builder] in-band linking update > > > Just short out the AFC buss. Simple huh? > > If you want to continue to use the AFC, be sure if you have to use > high side injection, you need to reverse the discriminator diodes. > Be very vareful the diodes are very fragile. > > Wade Lake wrote: > > > > The UHF Micor Mobile was a little tricky to tune, especially the > > AFC type. I would take care to follow the tuning procedure as > > outlined in the manual to the letter. > > Exactly to the letter. No short cuts ... or you'll be sorry and > need to start again. > > Hope this helps, > > Neil - WA6KLA > > > > > > Also, I am not sure what isolation measures you have already taken > > but they would have to be fairly extensive for pairs that close in > > frequency to coexist happily at the same site, in order to work > > properly. I would suggest all 100% sheided cables - preferably > > Heliax, Pass/reject type duplexers on both systems, and at least 1 > > extra high quality pass cavity on both transmitters. This is just > > for starters. Each site is configured differently so there may be > > several other measures to take. Good earth grounds to all > > components of the system and extra sheilding for mobile radios used > > in a full duplex environment are 2 other necessary things to do. > > > > It sounds like you have quite the system, and you are probably > > aware of the suggestions I am making here but sometimes the obvious > > things are the easiest to forget. Sounds like your getting there. > > > > Best of luck to you and 73, > > > > Wade - KR7K > > > > ----- Original Message ----- > > From: "Chris Peterson" <[EMAIL PROTECTED]> > > To: <[email protected]> > > Sent: Friday, January 07, 2005 4:35 PM > > Subject: [Repeater-Builder] in-band linking update > > > > > > > > All, > > > > > > A couple months ago I posted a question about in-band linking. I thought > > > I'd post an update on how it seems to be working. > > > > > > The repeater is on 442.750+ running about 25 watts. It's a converted > > Micor > > > mobile. > > > > > > The remote base listens on 443.025 and transmits about 25 watts on > > 448.025. > > > The repeater it's talking to is about 90 miles away over a very good path. > > > The remote base is an Icom 900 module attached to an FC-900. > > > > > > The repeater shows no obvious desense, and the signal strength of the link > > > is full-quieting. There is one odity, though. The link seems to have > > some > > > sort of high-pitched, low--amplitude, squeel on it. I assume this is some > > > spur from the repeater's transmitter. We plan to try to notch that out > > when > > > we get a chance. > > > > > > There is one odity, though. The Micor has been in service for about 2 > > years > > > now. When we first set it up, the receiver sensativity was about .35 UV. > > > Now, we can't get it to come below about .7UV. I should point out that we > > > didn't do the full tuning procedure, we just tried to tweak things back > > into > > > place. Also, the Micor has not been checked since it was put in service 2 > > > years ago... That is, it hasn't been checked until it was moved > > yesterday. > > > > > > My question is, is there anything that commonly goes bad in these things > > > that might cause this? We have plenty of spare receivers around, so > > that's > > > not an issue, I was just curious if anyone had any ideas of things to > > check. > > > > > > Also, does anyone have any simplified tuning instructions for the UHF > > Micor > > > mobile or any tips that might make the procedure go more smoothly? > > > > > > Thanks, > > > Chris, KG0BP > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > Yahoo! Groups Links > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > Yahoo! Groups Links > > > > > > > > > > > > > > > Yahoo! Groups Links > > > > > > Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
