Re: [Repeater-Builder] Micor Repeater Modifications
tahrens301 wrote: > Hi Folks, > > I picked up a bunch of Micor repeaters today, > and as I figured, they have the TLD xxx4 > receiver in them. (160-174mhz). > > I know that to put on 2 meters, new resonators > & some other stuff is required, but is it > necessary if I go down to 154? > > I'm working on this as a backup repeater for our > FD. > > Also, DRAT, no channel elements! > > Did find one other interesting piece - an X9000 > base station. Mighty big & will certainly hold > down the desk. (yep, it really is an x9000 :-)) > (previous thread). > > Thanks, > > Tim I wouldn't put anything into doing that for a Fire Dept. By the end of 2012, they are REQUIRED to go narrowband on VHF and UHF (low band and 800 are exempt). While there are kits to modify the receivers for Micors and others, there is some serious question as to whether the transmitters can be considered 'certified' or 'accepted' for narrowband use. It's more then just turning down the deviation. There is adjacent channel noise/splatter to consider. Not to mention frequency stability.
Re: [Repeater-Builder] Micor Repeater Modifications
tahrens301 wrote: > Hi Folks, > > I picked up a bunch of Micor repeaters today, > and as I figured, they have the TLD xxx4 > receiver in them. (160-174mhz). > > I know that to put on 2 meters, new resonators > & some other stuff is required, but is it > necessary if I go down to 154? > Yes, the capacitors will need changed for proper operation in the 150.8 to 162 range. The helical resonators for the VHF MICOR were in 2 splits, where the receiver boards were in 4 splits. The helical resonators for the lower of the two splits (xxx1 and xxx2) covered from 132 - 150.8 MHz. The helical resonators for the upper two splits (xxx3 and xxx4) covered 150.8 to 174 MHz. The better thing to do would be to trade someone looking to do a 220 conversion. The xxx4 is the better receiver to start with when doing a 220 conversion. I'd bet with the recent 220 inquiries here there would be someone willing to swap you xxx3's for your xxx4's! Kevin
Re: [Repeater-Builder] Micor Repeater Modifications
They might tune done. If not, try brass screws. I've used this to move high splits to 2 meters. tahrens301 wrote: > > > Hi Folks, > > I picked up a bunch of Micor repeaters today, > and as I figured, they have the TLD xxx4 > receiver in them. (160-174mhz). > > I know that to put on 2 meters, new resonators > & some other stuff is required, but is it > necessary if I go down to 154? > > I'm working on this as a backup repeater for our > FD. > > Also, DRAT, no channel elements! > > Did find one other interesting piece - an X9000 > base station. Mighty big & will certainly hold > down the desk. (yep, it really is an x9000 :-)) > (previous thread). > > Thanks, > > Tim > > -- mailto:o...@ozindfw.net Oz POB 93167 Southlake, TX 76092 (Near DFW Airport)
