[1000mp] AMP Question (off list)

[Win]

Dick, just don't use your internal Mark 5 tuner into the amp.  The internal 
tuner can be damaged when used into an amp, so they say.  I have never seen 
it happen, though.   Also, if you have more than a 1.5 to 1 swr into the amp 
itself, you will get some ALC fold back causing some distortion on your 
signal.

As long as you don't use the internal tuner, you will be OK.

There is one other issue.  If your amp key circuit draws too much current or 
has a open circuit voltage over 100 volts (check manual for this spec) you 
will need to buffer the amp key circuit from the Mark 5.

Good Luck with the BS7.  No joy here, yet.

Win, W0LZ


----- Original Message ----- 
From: "Dick White" <whiter26 at sbcglobal.net>
To: "Post Mark-5" <1000mp at mailman.qth.net>
Sent: Thursday, May 03, 2007 9:21 AM
Subject: [1000mp] AMP Question


>
> I have had a MARK-5 FIELD for a little over a year and have it filtered 
> well
> with INRAD filters. I have never used my amp with this rig and am thinking
> about putting it in line. Last November there was a thread about amps and
> the Mark-5. I do not have an outboard tuner, only the Mark-5 internal 
> tuner.
> I seem to remember some problems concerning the use of an amp with this 
> rig.
> I would appreciate some advice. I am not able to purchase a new tuner at
> this time. I don't use an amp 95% of the time. But there are times it 
> would
> be nice to have ( ie: BS7H).
>
> Here is what I have:
>  Ameritron AL-600 amp (it is 10 years old)
>  My Mosley 4 element YAGI does not require a tuner from the bottom of the
> band up to 300 on 20 meters.  The SWR is never
>   over 1.2:1 on this band.  15 meters is almost as good and 10 meters not
> quite as broad banded. Both 10 and 15 M have SWR not over 1.2:1 up to 100
> from bottom.
>
> Question- Can/should I run this amp without and external tuner, or am I
> risking damaging the Mark-5 ?  Advice and comments appreciated.
>
> 73  Dick  KS0M
>
> Richard C. "Dick" White
> Fulton, MO. 65251  U.S.A.
> whiter26 at sbcglobal.net
>
> Live simply. Love generously. Care deeply.
> Speak kindly. Leave the rest to GOD.
>
> Amateur Radio Station - KS0M
>
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