[Repeater-Builder] Re: MTR2000 UHF Service manual
I agree with Eric, almost sounds like your 1K (or PL/DPL tone) is on and affecting the bandpass of the RX. Also check to make sure unit is not programmed for narrow band operation. Would also confirm what version of software repeater is running, could have an old version with known bugs. Have 50 units on the air and never heard of that issue. Ebay ham swap items often have odd issues, saw a MTR for sale, advertised as a 420-470 unit, on 440 ham channels, but looked like a high power 450-470 unit, contacted seller with my questions and he explained that unit would only do 60 watts so it must be a full band unit doing more than the rated 40 watts.Seller didn't think it was necessary to change his listing.Unit sold for a very high price and had quite a few bidders, hopefully buyer knew what he was getting. Factory service is running about $850.00 per module, and about $1450.00 for a complete repeater.We have repaired a few power supplies, but rest of unit is factory only service. TRACOMM In Repeater-Builder@yahoogroups.com, Eric Lemmon [EMAIL PROTECTED] wrote: Camilo, The modules in the MTR2000 station are not user-serviceable, so the field service manuals do not contain schematic diagrams. If you believe that the receiver module is defective, you should send it to the Motorola Infrastructure Depot for repair. I currently have six MTR2000 stations in service, but have never seen the problem you describe. 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:[EMAIL PROTECTED] On Behalf Of Camilo So Sent: Monday, October 20, 2008 6:09 PM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] MTR2000 UHF Service manual Need help to order a MTR2000 service manual that have the schematic diagram of the receiver unit, Got this unit from Ebay, Hook up the unit on my bench with a dummy load on the TX out, and apply signal on the RX input with a IFR1200, The squelch open at 0.12 micro-volt at 0.15 uv its 12 DB Sinad, when signal was increased to about 1.0 micro-volts or higher the receiver drop out, as if the agc is overloaded that cut out completely and also drop the TX, Have anyone ever experience this problem before, This is the first time I have seen this kind of problem , and its hard to fix it w/o a diagram. any help is highly appreciated. de w4cso Camilo
[Repeater-Builder] Re: MTR2000 UHF Service manual
Just out of curiosity are you performing these tests with a 1000 cycle tone and if so, have you tried it with no modulation? It almost sounds like it is going out of the bandpass of the receiver when you increase the signal level. What happens when you vary the frequency a few KC higher or lower in frequency than your center frequency. I assume you have already tried resetting the radios settings back to factory default settings in the programming software. Joe --- In Repeater-Builder@yahoogroups.com, Camilo So [EMAIL PROTECTED] wrote: Need help to order a MTR2000 service manual that have the schematic diagram of the receiver unit, Got this unit from Ebay, Hook up the unit on my bench with a dummy load on the TX out, and apply signal on the RX input with a IFR1200, The squelch open at 0.12 micro-volt at 0.15 uv its 12 DB Sinad, when signal was increased to about 1.0 micro-volts or higher the receiver drop out, as if the agc is overloaded that cut out completely and also drop the TX, Have anyone ever experience this problem before, This is the first time I have seen this kind of problem , and its hard to fix it w/o a diagram. any help is highly appreciated. de w4cso Camilo
Re: [Repeater-Builder] Re: MTR2000 UHF Service manual
Hi Joe, Yes I did it with a 1000 cycle tone with and with out 1000 cycle but with PL, You are correct I did try to vary the freq, and to my surprise even apply TX freq to RX freq that was 5 MHZ difference it still have the same sensitivity, One thing I did not do is resetting the unit, I am new to this unit, never work on it before, question how do you reset the unit to factory default, is there a reset button or use of software. As you and every one know if you got something off Ebay, That some one already playing around with the unit, it is also possible programming problem, Is there a way to contact you? on phone or Echolink, Thank you for the reply. 73 W4CSO Camilo - Original Message - From: Joe Burkleo To: Repeater-Builder@yahoogroups.com Sent: Tuesday, October 21, 2008 2:13 AM Subject: [Repeater-Builder] Re: MTR2000 UHF Service manual Just out of curiosity are you performing these tests with a 1000 cycle tone and if so, have you tried it with no modulation? It almost sounds like it is going out of the bandpass of the receiver when you increase the signal level. What happens when you vary the frequency a few KC higher or lower in frequency than your center frequency. I assume you have already tried resetting the radios settings back to factory default settings in the programming software. Joe --- In Repeater-Builder@yahoogroups.com, Camilo So [EMAIL PROTECTED] wrote: Need help to order a MTR2000 service manual that have the schematic diagram of the receiver unit, Got this unit from Ebay, Hook up the unit on my bench with a dummy load on the TX out, and apply signal on the RX input with a IFR1200, The squelch open at 0.12 micro-volt at 0.15 uv its 12 DB Sinad, when signal was increased to about 1.0 micro-volts or higher the receiver drop out, as if the agc is overloaded that cut out completely and also drop the TX, Have anyone ever experience this problem before, This is the first time I have seen this kind of problem , and its hard to fix it w/o a diagram. any help is highly appreciated. de w4cso Camilo
