Doug, I have had some similar experiences here in the RB skunk works. I thought I was the only one to come across this phenomenon. I first noticed it with the batch of 5 or so that I got around the first of the year. I'm not sure if they changed to a different op-amp mfg or what.
My experience was the same as yours that I merely jumpered the input to the output - bypassing the TS-64 and the whole setup runs great. (no decode of course). On the ones I ran into, I merely turned down the pot in the disc. and then adjusted the input pot on the controller to compensate. I am scratching my memory, but I think I *was* able to re-produce this behavior on the test bench with a sine wave generator. Please let us all know what you find out. Scott Scott Zimmerman Amateur Radio Call N3XCC 474 Barnett Rd Boswell, PA 15531 ----- Original Message ----- From: "Mike Morris WA6ILQ" <[EMAIL PROTECTED]> To: <Repeater-Builder@yahoogroups.com> Sent: Tuesday, September 02, 2008 3:58 PM Subject: Re: [Repeater-Builder] MSTR II VHF and the TS-64MSTII(Repeater Unit) > At 12:33 PM 09/02/08, you wrote: >>Are there any guidelines as to what level from the receiver to the >>TS-64 should >>be used?? The out put of the receiver is set for one volt with a 3khz >>deviated >>signal and for my part seems to be a bit high for the lp/hp filter op >>amps. In >>my case, when observed with a scope, the signal out of the rx at pin >>11 is nice >>and clean as it is going into the lp filter section on the TS-64. >>Coming out of >>the TS-64 hp filter, it is distorted and noisy. With the levels left >>the way they >>were, the unit could be made to take off at a low frequency and high >>amplitude. >>Also, there appears to be a hf signal coming out at all times with an >>amplitude of >>about 105mvs. For some reason I can't seem to sync it in with the >>scope.(grass!) >> >>If I reduce the level out of rx to the point where it does not take >>off, and most >>of the distortion disappears, I still have the steady "grass" >>somewhat diminished >>in amplitude. The grass is removed by the input circuit of the MRC100 >>controller >>and the audio to the first op amp is clean. The distortion is as heard on >>the >>MSTRII speaker. I won't know what it sounds like coming out of the >>controller >>until I get it operational. (blown op amp) >> >>I did patch the TS-64 out and the repeater works just fine. The TS-64 >>also functions >>the way it is supposed to when in the radio. The squelch works with >>the reduced receiver >>level and the grass does not seem to bother it. >> >>What is the recommended input level that should be set for the TS-64. >>Has any one else >>seen this behavior. >> >>Thanks and 73 >> >>Doug VE5DA > > The TS-64 data sheet (at > <http://www.repeater-builder.com/com-spec/com-spec-ts64inst.pdf>) > says "15mv minimum" and that the input is "60K Ohms AC coupled". > > In your shoes I'd call Com Spec at 800-854-0547 between 8a and 4:30p > Pacific Time > and describe the situation. Spence is good people and he'll help. > > Mike WA6ILQ > > > ------------------------------------ > > > > Yahoo! Groups Links > > > -------------------------------------------------------------------------------- No virus found in this incoming message. Checked by AVG - http://www.avg.com Version: 8.0.169 / Virus Database: 270.6.14/1647 - Release Date: 9/2/2008 6:02 AM
