Ok, well if I set me service monitor up on the transmitter, put my selectivity to 20dBm, and the display to 10Db, what should I be looking for on the spectrum analyzer. I'm getting the manual out now to see if it gives instructions on transmitter testing.
Mathew -----Original Message----- From: Chuck Kelsey [mailto:[EMAIL PROTECTED] Sent: Tuesday, January 25, 2005 3:41 AM To: [email protected] Subject: Re: [Repeater-Builder] Repeater Rx is Better than TX, Why You need to check the entire transmitter, not just the exciter. Chuck WB2EDV ----- Original Message ----- From: "Mathew Quaife" <[EMAIL PROTECTED]> To: <[email protected]> Sent: Tuesday, January 25, 2005 2:17 AM Subject: RE: [Repeater-Builder] Repeater Rx is Better than TX, Why > > Well have to rule out the wattmeter, I have two of them, both gave the > same > results, one being bird wattmeter and the other being Yaesu YS-500. The > antenna has only been in-service since September. If it was the antenna, > would it not be noticed on the RX as well, which is not having any > problems > at all. I will put the exciter back on the scope today and look at it, > but > last I looked it was fine. Someone mentioned my past problem with > adjacent > channel noise, yes, there was a problem there, the deviation had jumped up > to over 6 Khz wide, brought it back down to 4.5 Khz via the controller and > that took care of that. Will pump the signal into the service monitor and > see what that reads. All I know it seems strange for it to receive twice > as > far as it does transmit. > > Mathew > > > -----Original Message----- > From: Mike Morris WA6ILQ [mailto:[EMAIL PROTECTED] > Sent: Monday, January 24, 2005 3:41 PM > To: [email protected] > Subject: Re: [Repeater-Builder] Repeater Rx is Better than TX, Why > > > Either your wattmeter is lying, or you have one of two > worse problems.. > > 1) > Check your TX with a spectrum analyzer. I'll bet that > your on-frequency power is down. > A wattmeter reads power on all frequencies - spurs or > on frequency. > > I was bit by that oversight years ago. > > A 6m 100w TX that used to be clean ended up as a comb > generator due to a leak in the roof creating corrosion in > the PA deck... The on-channel power was maybe 20w, > everything else was trash. > > It was a miracle that we caught it before someone else > figured out where the grunge was coming from. > > 2) > Your diamond antenna may be hosed and giving you a > low ERP. > > Mike WA6ILQ > > At 03:28 PM 1/24/05, you wrote: > >>Ok, I know this sounds silly, but my repeater is now hearing >>better than it transmits. Here's the setup, the the issue. I have >>a Maggorie (no comments) HiPro transmiitter running 2 watts into >>a Vocom Amp running 160 Watts into the duplexer, 130 out to the >>antenna, fed with 7/8" hardline into a Diamond Dual Band Antenna >>at 92'. VSWR is 1.1:1, with 130 watts forward and 1/10 watt reflected >>at an impedance of 52 ohms, (MJF 259). >> >>The receiver is a GE Mastr Pro ER-41 series receiver, tied to an ARR >>preamp at 24 db going through a two of the DB 4001-1 for filtering >>and finally into a set of TX-RX Duplexers, 3 cans pers side. >> >>I used to be able to hear the repeater nearly full scale for about >>40 miles with no problem. Recently at 20 miles away, it's barely at >>1/4 scale on my radio. This has been noticable with several users >>on the system, and my mobile just got a new antenna, all set and >>tested fine there, and other repeaters there is no problem. I can >>hear users nearly 60 miles from the repeater, but they can't hear >>the system. >> >>Is it possible something could be wrong on the duplexer end of it. >>I get no decense on the system, and receive audio is ok quality at >>60 miles, just less than full quieting. >> >>Any thoughts. Mybe just propagation. >> >>And the 160 watts from the Vocom amp was as low as I could go before >>I began to cause havick, so it does not like lower power. >> >>Mathew Thanks! > > > > > > > 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/
