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Why don't you holier than thou hams just stuff your spectrum & Coy bashing. He has forgot more about radios than yo'all will ever know. He is doing the best he can with what he has. Yes the spectrum is a POJ. I wouldn't have one on a bet. So give it a rest. ----- Original Message ----- From: Virden Clark Beckman Sent: Saturday, November 29, 2003 6:28 PM Subject: Re: [RE: [[Repeater-Builder] Spectrum Communication SCR1000 VHFManual]]] I am suprised nobody offered to sell the spectrum fixer some wingnuts?
Maybe he already has some or slides with hairpin cotters?
JOHN MACKEY wrote:
>
> WOW!! Coy said he went with the spectrum because of money. Now this
> offer of a straight trade is one he can't pass up due to the money issue!!
>
> "Kevin King" <[EMAIL PROTECTED]> wrote:
>
> > If money is your limiting factor. I will trade you a mastr II mobile for
> the
> > spectrum. Just so I can keep it off the air. I have been the recipient of
> > interference from one of those at a site I use to manage.
> >
> > Kevin
> >
> > -----Original Message-----
> > From: ac0y5 [mailto:[EMAIL PROTECTED]
> > Sent: Friday, November 28, 2003 11:56 AM
> > To: [email protected]
> > 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
> >
> >
> >
> >
> >
> >
> >
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> >
> >
> >
> >
> >
> >
> >
> >
> >
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> >
> >
> >
>
>
>
> Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
--
73...Clark Beckman N8PZD
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