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Author Topic: Easy straightforward way to limit power of TS-930=not turn down mic gain?=55-75?  (Read 1357 times)
N6QWP
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Posts: 326




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« on: January 12, 2018, 09:03:36 AM »

Has anyone found an easy way limit the SSB output of a Kenwood TS-930....other than turning down the mic gain?

Looking for a reliable, constant way to limit to the output power to 55-75 watts so as to not overdrive the amp.....or require a scope.

Turning down the mic gain or using ALC is too dependent upon operator to perform adjustments properly.  Looking for an easily performed, accessible internal adjustment or an easy mod that can limit the maximum output power to a predetermined value (at all times).
« Last Edit: January 12, 2018, 09:10:31 AM by N6QWP » Logged
W9IQ
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« Reply #1 on: January 12, 2018, 09:24:45 AM »

Have you considered a variable negative supply connected to the ALC jack?

- Glenn W9IQ
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- Glenn W9IQ

I never make a mistake. I thought I did once but I was wrong.
N6QWP
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« Reply #2 on: January 12, 2018, 09:32:27 AM »

Hi Glen--Trying to keep it "within the box".  Don't want to rely on correctly adjusting anything-once the initial setting is completed and double checked.

It all has to do with trying to be assured that I will not be overdriving my old 30L-1.  Trying to eliminate all the possible causes of over stressing the fragile 811 tubes.
« Last Edit: January 12, 2018, 09:49:03 AM by N6QWP » Logged
KM1H
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« Reply #3 on: January 12, 2018, 09:36:14 AM »

Quote
Have you considered a variable negative supply connected to the ALC jack?

- Glenn W9IQ

A 9V battery and pot has worked well for that as far back as the KW hybrids.

Carl
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W9IQ
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« Reply #4 on: January 12, 2018, 09:40:39 AM »

Brad,

My thought for the variable supply is that if it is AC powered, it could be a set it and forget it type mod. Using a 9 volt battery works too until the battery dies...

But I understand your in-the-box requirement. I hope you find a solution.

- Glenn W9IQ
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- Glenn W9IQ

I never make a mistake. I thought I did once but I was wrong.
N6QWP
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Posts: 326




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« Reply #5 on: January 12, 2018, 10:41:38 AM »

At present, I have two 930's (one pre 309xxxx and one post) and a 940.  Guess I want to dedicate the "old" 930 as a driver to the 30L-1......and make it part of my QRO setup.  For that reason, I would like to "semi permanently" adjust the output down.

I am supposing that there is an internal adjustment that can accomplish this feat.....just waiting to hear from someone who has already tried it.

I was able to do this to a TS-430 (after trial and error) that I have been using as an exciter.  Just reluctant to start turning things inside the 930 until I have some "pre learned" knowledge.  Don't want to start meddling around with the wrong adjustments and risk messing up the alignment.
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KM1H
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« Reply #6 on: January 12, 2018, 11:34:57 AM »

Quote
My thought for the variable supply is that if it is AC powered, it could be a set it and forget it type mod. Using a 9 volt battery works too until the battery dies...

The 9V battery is quite ubiquitous in a home and having a spare handy is not rocket science.

The one used on the TS-830 I use to drive customer amps and the 6M transverter for those amp conversions is at least 3 years old. I wouldnt want to blast an AL-811 with 120W now would I? Double sided tape holds it all in place and in easy reach.

Carl
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ZS5WC
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« Reply #7 on: January 13, 2018, 05:41:51 AM »

 :)Use the power control knob to achieve required output. Turn CCW to reduce power.
It is like this on 940, sure 930 is the same?.

Using the PWR knob in conjunction with ALC, and keeping ALC in check will be surefire safe way of driving the amp.
I use the 940S to drive a VERY fussy Solid State amp and it never overdrives it.

73 de William
ZS4L / ZS5Wc
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N6QWP
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« Reply #8 on: January 13, 2018, 07:56:49 AM »

The 930 DOES NOT function this way.  It is DIFFERENT from the 940.  (I have both).

There is NO POWER CONTROL on the 930.  

I realize that I do ask some pretty basic questions....but, I would not have asked if it was that simple and obvious.
« Last Edit: January 13, 2018, 08:18:00 AM by N6QWP » Logged
K8AXW
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« Reply #9 on: January 13, 2018, 09:49:05 AM »

QST had a construction article within the last couple years that ran from a 12VDC power source. It adjusted the ALC to a level with a front panel control.  Once set, it's left alone.

The reason I built it was to control the transceiver (TS-830S) output so I could safely tune my external antenna tuner.  Works great and would work for limiting drive to your amp.
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N6QWP
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« Reply #10 on: January 13, 2018, 10:50:29 AM »

Thanx AXW--Anyone have access to find out in what issue?
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KM1H
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« Reply #11 on: January 13, 2018, 01:55:04 PM »

Why do people want to complicate such a simple task?
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N6QWP
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Posts: 326




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« Reply #12 on: January 13, 2018, 04:05:37 PM »

It has to do with trying to keep "Old Timers" minds engaged in something that keeps the attention and interest in something familiar.  

If you hang around long enough, you will understand.  It's not only age....

Environment and history have something to do with it.

Trying to keep "inquiring minds" engaged....and then there is the teaching aspect of raising question and seeking answers for the next generation of hams who will be seeking information that will only be available, if it is raised and anwered, here in this and similar forums.  
« Last Edit: January 13, 2018, 04:16:54 PM by N6QWP » Logged
K8AXW
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« Reply #13 on: January 13, 2018, 05:28:07 PM »

QWP:  The article was called: AD5X Transceiver Power Control.  Here it is.

http://www.ad5x.com/images/Articles/XcvrPwrCtrl.pdf

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N6QWP
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Posts: 326




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« Reply #14 on: January 13, 2018, 08:12:43 PM »

Thanx AXW......appreciate your time to dig that out.

I KNOW that SOMEWHERE, there is an INTERNAL adjustment to control output.

It WILL NOT require ANY modification or adjustment.

JUST NEED TO IDENTIFY WHERE THAT ADJUSTMENT IS LOCATED!!!!  

WHERE IS THAT ADJUSTMENT LOCATED?Huh?

WHERE DO WE "DUMB DOWN" THE OUTPUT POWER ON SSB???
« Last Edit: January 13, 2018, 08:15:06 PM by N6QWP » Logged
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