Probably any used commercial vendor will have them. I mostly use Bob Parker, he took over from Bud Wolfe. See the repeater builders web page for a list of vendors:
http://www.repeater-builder.com/rbtip/supplyindex.html John/N4SJW --- In [email protected], "Al" <[EMAIL PROTECTED]> wrote: > Where did you buy the Mitrek rx preamp? > > ----- Original Message ----- > From: "johnmichaelwelton" <[EMAIL PROTECTED]> > To: <[email protected]> > Sent: Saturday, May 21, 2005 9:23 AM > Subject: [Repeater-Builder] Re: Poor Repeater RX > > > > Alexander, > > > > Motorola makes a preamp for their T43-T83 Mitreks that is inserted > > after some filtering on the front end. May be a better way to > > implement a rx preamp in your setup, and they're pretty cheap, bought > > a few recently for $25/each. Also, I agree with Glenn that separating > > the Mitrek decks into separate receive and transmit rather than doing > > the duplex mod is a much better approach for 2M on the Mitrek. > > > > John/N4SJW > > > > > > --- In [email protected], "Alexander Tubonjic" > > <[EMAIL PROTECTED]> wrote: > >> Hello, > >> Well here is one that cant be figured out locally, thought I would > >> throw it to the experts. My high school radio club has recently > > made a > >> few upgrades to our VHF repeater. We replaced the Ringo Ranger > > antenna > >> with a Comet GP-9 Antenna, replaced the 9913 coax with Andrews 1/2'' > >> Heliax, and put a Mirage Pream inline. The problem we are having is > >> mainly with the preamp (I think) > >> I will describe the setup and give all the specs first. The > > repeater > >> Rx and Tx is from a 110 Watt Motorola Mitrek power out from the > > Mitrek > >> is 50 watts. The power supply is an Astron RS-70M, Duplexer is a > >> Sinclair Q202G (yes, it is properly tuned and working as it should) > >> the antenna is rooftop on the schools theater building (the roof is > >> about 75 feet AGL and the antenna is on an 8' mast pipe) there are > > no > >> obstructions for at least 5 miles around. The preamp setup is as > >> follows, it is after the duplexers and before the reciever. We have > >> the preamp directly connected into the duplexer and a jumper going > >> from the preamp to the Rx bulkhead on the repeater cabinet. The > > preamp > >> has two settings, a higher gain and a lower gain setting, initially > > we > >> had it setup to the higher gain setting but I went up today and > >> switched over to lower gain and turned the power output to 30 watts. > >> The problem we have is the Rx is not what is should be. It is a > > tad > >> worse then when we were running the repeater at 15 watts without the > >> Preamp. I would really like to get the preamp to work like it should > >> in the repeater system, I just dont have any ideas on what to do > > next > >> to get better sensitivity on the machine. Any thoughts and ideas > > would > >> be appreciated. Thanks. > >> Alexander KG4OGN > >> > >> P.s, all jumpers are made with double shielded ridgid coax, so > > thats > >> not the cause of the problem. > > > > > > > > > > > > > > > > Yahoo! Groups Links > > > > > > > > > > > > > > > > > > > > _____________________________________________________ > > This message scanned for viruses by CoreComm > > > > 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/
