Off Topic: Knight T-150 Transmitter

[Joe Cro N3IBX]

Hello,
        Name here is Joe Cro ( N3IBX) in Washington Crossing, Pa. I also have 
a T-One-Drifty but not the "A" variant. I don't know what the design 
differences are between the two models. I can tell you that it will just 
about match a coathanger on ten meters. The VFO is not stable however and may 
draw criticism from those who have more stable transmitters. I have run mine 
on AM though I have it out of service at present to replace the filter caps. 
I run it between 10-15 watts AM and the carrier swings to about 20-25 for the 
best audio ( screen modulation). Don't even thing of trying it on 6 meters 
due to lack of VFO drive unless you use crystal control. On 10 meters it's 
not much better. On 40 and 80 meters, it's a little better - hence the name 
Tee-One-Drifty!

The AM audio quality won't put you in the league with the BC transmitter 
negative feedback boys but they will be able to hear you. Remember screen 
modulation is not very linear and it will have plenty of distortion. My 
recommendation is to run it with a scope and tune your modulation for as near 
a perfect trapeziod as you can get. Then you'll sound acceptable (somewhat - 
hi).

Good luck with it and 73.
                                     Joe Cro N3IBX

******************************************************************************

********************
As a fellow owner of a Knight T-150A, may I take this opportunity to wish
good luck on getting that rig on the air. Be sure to rehearse your technique
of holding the VFO in one hand to adjust frequency as you transmit. Makes
the Eico 753 look good. Mine is still on the bench as I ponder how best to
resolve drift before I use it. You might be lucky and hacve one that's
fairly stable. As for the tuner, you won't need it. That PI network is
pretty forgiving and will match almost anything.

----- Original Message -----
From: reds1964 <reds1964 at NETZERO.NET>
To: <HEATH at LISTSERV.TEMPE.GOV>
Sent: Sunday, December 31, 2000 11:43 AM
Subject: Question


Hello All,

I have an older transmitter (Knight T-150A) that I hope to put on the air
soon.  With these older rigs is it necessary to use an antenna tuner?
According to the Knight manual the rig will match impedances ranging from
40-600 ohms. It would seem to me that one could use just about any kind of
antenna and the rig would match it with no problem without the antenna
tuner. If this is the case and I wanted to use a random wire antenna how
would I feed it? The T-150 has a regular coax connector on the back of the
rig. Should I just feed it with coax or should I still rout it through the
antenna tuner? How should I tune it for minimum SWR? Any help would be
appreciated.

Carl KA5KAB


Joseph Cro N3IBX

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