Okay, How much, tell me all about the machine. 73 AC0Y
--- In [email protected], "Joe Cody" <[EMAIL PROTECTED]> wrote: > Hi Coy. > I have a master2 exec.converted to a repeater. > It is tuned to 146.385/146.985. > I recently changed frequencies and got new > repeaters so this one is excess. > will sell cheap or trade for 2m/220/440 mobil/handy > I am in Winter Haven(about 40 miles east of you) > > Joe /KE4WDP > [EMAIL PROTECTED] > ----- Original Message ----- > From: "ac0y5" <[EMAIL PROTECTED]> > To: <[email protected]> > Sent: Friday, November 28, 2003 11:55 AM > Subject: [Re: [[Repeater-Builder] Spectrum Communication SCR1000 VHF > Manual]] > > > > Thanks for the input Tony. > > The primary reason that I'm going to try the Spectrum is It's what I > > can afford now and It's something I havn't ran into before. If this > > one gives as much trouble as indicated by thoes of you who have > > owned them then I'll do something different. But for now it sounds > > like a challange and it's real cheep -$0.00-. I unexpectedly came > > into two 2 meter pairs at the same time. Here in Central Florida > > getting a pair is like finding hens teeth so the first pair got the > > MASTRII and the second pair will get the Spectrum until I get tired > > of tweeking it or until I get a replacment, another MASTRII. I can > > only afford a little at a time. > > 73 Tony and Thanks > > AC0Y > > > > > > --- In [email protected], Tony King - W4ZT > > <[EMAIL PROTECTED]> wrote: > > > First let me start out by saying that I currently have an SCR1000 > > in > > > service on 2 meters but the Mastr II is cooking on the bench and > > will > > > replace the Spectrum as soon as I finish the box to move the CAT- > > 1000 into. > > > > > > At 08:43 PM 11/26/2003, ac0y5 wrote: > > > >It seems a lot of the complaints are from oscillator drift and > > > >tuning drift. I have a few questions Does anyone know if the main > > > >problem resides in the exciter, or the power amp? > > > > > > I have replaced the PA in this SCR1000 because the old one > > failed. This is > > > a 75 watt model which has the power control board (which gives you > > high/low > > > power switching). The manual tells you that you MUST re-align the > > exciter > > > to make it work properly on the reduced voltage. I always found > > it to be a > > > bit unstable so it always stayed on high power. If you tune the > > PA, you'll > > > find some instability there also. I don't know the answer to the > > question > > > of bad components or bad design. I'd rather stick with what I've > > got > > > personal experience with. > > > > > > As for oscillator drift, the SCR1000 was available with a crystal > > oven but > > > mine didn't come that way. It's lived its entire life in the house > > where > > > there have been no extremes of heat and cold. Yet, it would still > > move > > > around some. I did place a small light bulb (in series with a > > resistor) > > > right in the oscillator portion of the exciter board and it seemed > > to > > > become more stable. > > > > > > >My plan would > > > >eliminate all problems related to the oscillator because the Tx > > and > > > >Rx will be generated from a pair of Numerically Controlled > > > >Oscillators well filtered. I have already designed the entire > > > >circuit. Now, if Anyone knows where the problem may lay then I > > will > > > >be able to take care of the problem an external PA that I have or > > an > > > >exciter that I can buy cheaply. The power supply should be okay > > > > > > I had problems with the power supply. In the 75 watt model the > > power > > > resistors which are mounted on terminal strips between the > > transformer and > > > the large heat sink on the back get so hot that they will melt > > their leads > > > right out of the solder. That compounds the problem and led to > > erosion of a > > > resistor lead and supply failure. The entire supply is horribly > > > inefficient, generating more heat than the entire unit consumed in > > its > > > electronics. I finally removed the transformer, the resistors and > > the > > > large heat sink with the pass transistors and powered the unit > > externally. > > > > > > >and > > > >it has been stated that the receiver is quite sensitive. If > > > >necessary I can add a 5 or 7 pole helical resonator to the front > > end. > > > > > > It's sensitive if you can get it tuned without desensitization. > > That's the > > > biggest problem with the receiver. It isn't as sharp as > > commercial > > > receivers like the Mastr II or Micor so don't expect that kind of > > performance. > > > > > > From your many other posts it would appear you have considerable > > repeater > > > experience which makes me wonder why you would want to take this > > on. It's > > > not a joy to work on. The controller is junk (I replaced it with > > a CAT1000 > > > over a decade ago). It's just old technology that doesn't come > > close to the > > > old technology you find built by GE and Motorola. If you must > > redesign the > > > oscillators, replace the exciter and PA, redesign/modify the > > receiver, come > > > up with a controller, perhaps replace the power supply, hope the > > switches > > > aren't intermittent (like some of mine), replace the meters (the > > originals > > > were useless), toss the local microphone and get something better, > > what's > > > left? It WAS a pretty box. I just spent the evening drilling a > > front panel > > > for my new VHF controller box which will contain the CAT1000, some > > > interface stuff, a TS64, 4-LEDs, a volume control, a squelch > > control, > > > enable/disable and simulate switches for COR, CTCSS and PTT, a > > speaker, a > > > fuse, and on/off switch, and two test jacks to access the speaker > > leads > > > from the front. It will look and function almost identically to > > the > > > controller (containing a CAT250) that I use with the UHF Mastr > > II. The > > > Spectrum is going away... finally. > > > > > > Good luck with your project. I'd be interested to know how it all > > works > > > out for you. > > > > > > 73 and Happy Thanksgiving everyone! > > > > > > Tony W4ZT > > > > > > > > > > > > > > > > Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/ > > > > > > Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
