This is a repeater that has been in service.

Thanks for your suggestions; we will revisit the site and check things out again with your notes in hand.

Our ham radio club is having a tx power output problem with our 75 watt UHF Micor base/repeater station. Exciter power output is 1.8 watts, but the power control board keeps shutting down the first stage of the PA. We've replaced the power control board, circulator, and PA with spares known to be in...

A repeater group in our area has a VHF MTR2000 interfaced to a Zetron panel. For months now they've been experiencing audio level drops on weak signals into the repeater. There is no level change if the signal is DFQ. The local Moto authorized shop has thus far been unable to resolve the problem. An...

My Celwave PD 497-1-1 VHF duplexer just can't seem to provide adequate tx/rx isolation (Micor 100 watt repeater with 0.6 MHz tx/rx separation). Everything else seems to check out okay; jumper cables, connectors, receiver, and hard line. I inherited care of the duplexer within the past 2 years; I est...

Has anyone here ever replaced a fan in a GR300 repeater housing?

If so, how tough of a job is it, and is the fan a stock muffin fan, or a Motorola specific part?

Thanks.

We're attempting to set up a repeater using 16 channel GM300's and an external controller (a CAT 1000). We've done this before twice, but seem to be stumped this time because we can't get either the receiver radio or link radio to produce the right voltage swing the controller is looking for in conn...

Did GM300s ship from the factory with TOT enabled?

If so, what was the default value?

Thanks.

Thanks.

I'm using a UHF high power GM300 to drive an aftermarket PA in a repeater application. Tx power on the GM300 is set low - about 18 to 20 watts. An intermittent audio problem developed in one unit - a low rumble in the audio, plus drop out for extended periods. Fortunately, I had a spare unit and was...

There’s an abandoned 470-475 MHz 5db gain Station Master antenna with good 7/8” hard line at the tower site our ham club has a 440 MHz repeater installed. We’ve been thinking for a long time about adding an auxiliary 146 MHz receiver to our 440 MHz repeater, but can’t afford the costs associated wit...

Thanks for all of the suggestions thus far. 2 questions: 1) Does anyone know approximately how much it will cost to replace the finals? 2) Isn't there an option in the GM1225 for a heavy duty final if you plan to use the radio in a GR1225 repeater set up? I'm wondering if there is a similar heavy du...

I've been using high power UHF GM300's for several years to drive an after-market PA in a repeater set up. I've always reduced the radios' power output well below their rated 40 watts; typcially in the 20-25 watt range. I also have a small box fan directed on the heat sink 24/7. Despite the power re...

Our ham club is currently operating a Motorola Micor VHF repeater, with a RFS 497-1-1 6-cavity duplexer, and RFS 200 Super Stationmaster antenna. Output power from our PA to duplexer was recently measured at 120 watts. Although the duplexer is rated at 350 watts, we recently read that the combinatio...

Our 2-meter Micor repeater is equipped with an aftermarket controller (SCOMM 7K). The controller has an audio delay module installed to mute DTMF tones and prevent squelch crashing. Could we be effectively cutting receiver range by using the audio delay feature? That is, could very noisy signals be ...

If you couldn't afford a new or used Motorola 2-meter repeater, would you choose a Kenwood TKR-750 or Vertex/Standard VXR-7000?

Both priced about the same, with very similar features; which one is the better overall performer though?

Considering Sinclair SD224 or Andrew/Decibel DB224.

The Sinclair is $325 more expensive. The antennas are electrically equivalent (6db omni, 9db offset gain).

Is the Sinclair worth the extra $325?

Due to site congestion, I need to use a dual exposed bay UHF dipole antenna to support 2 UHF systems (a repeater & link radio). Question: anyone have experience in using an Andrew/DB DB408-B below 450 MHz (440-450)? If so, what's the performance been like (i.e., SWR and radiating pattern)? Also,...

Our linear rack mounted Astron 50A supply started to crap out after about 10 years of medium duty use. My partner replaced a rectifier diode, but it crapped out again in less than 6 months. I bit the bullet and replaced it with a Duracomm switching power supply. It was a lot easier on my back bringi...

Our ham club has the software and RIB necessary to program all of our GM300's.

Question: what other Motorola radios should we be able to program without purchasing another RIB, or upgraded software?

Could we program a CM200/300?

A two-way shop owner told me today that he now avoids using fiberglass base station antennas and prefers exposed dipole arrays instead. He claims the fiberglass models all take on water after about 10 years, don't afford any lightning protection, and radiate less effective patterns than the exposed ...

The model numbers of the Middle Atlantic device is:

RSH4A2S, or RSH4C2S, or RSH4S2S depending upon which finish you want.

The rack holds 2 GM300's side by side.



Tony

Thanks. I now have the model number and price ($104).



Tony

Thanks Tom. I'll try to Google a phone number for them.



Tony

Anyone know the part number for this item (the 19" rack mount version) and what the approximate list price is?

Also, will it hold 2 GM300 radios?

Thanks.



Tony

Thanks. The MSR2000 is no longer supported by Motorola, correct? How readily available are parts for this unit?

Can anyone determine whether this repeater would have a continuous duty PA installed?

C73KSB3106AT

Thanks.



Tony

Seeking feedback on performance of VHF compact base station duplexers. Our landlord has advised use to get our old 6 can unit off of the floor. We're thinking of installing a taller cabinet and using a rack mounted compact duplexer instead. Anyone out there ever used one with good results? I see the...

I recently assumed responsibly for overseeing the care and maintenance of a 2-meter Micor repeater station, which is physically located in the same room as a combination analog/digital cell site owner by a wireline carrier. The repeater antenna is mounted on a rooftop, in the same horizontal plane a...

The channel element of our ham repeater club's 110 watt VHF Micor repeater oscillates constantly and can be heard within 25-50 feet of the station when the unit is in standby mode. Some Motorola trained techs tell me this is a common occurrence and not worth troubleshooting, others say there's likel...

My repeater club is considering replacing our existing stock power supply with a new switching supply. This would cut the cabinet weight down significantly; carrying the cabinet up 2 steep flights of stairs to the rooftop equipment room has taken its toll on our backs! Question though; is everything...