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[TowerTalk] Fw: [SteppIR] Re: 3 ELEMENT 180 DEG SWR PROBLEM

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Subject: [TowerTalk] Fw: [SteppIR] Re: 3 ELEMENT 180 DEG SWR PROBLEM
From: "Al Williams" <>
Date: Thu, 18 Jun 2009 17:06:49 -0700
List-post: <">>
----- Original Message ----- 
From: Al Williams 
Sent: Thursday, June 18, 2009 9:37 AM
Subject: Fw: [SteppIR] Re: 3 ELEMENT 180 DEG SWR PROBLEM

Please provide us with as much detail info on those signals as you can:

1. Where do you connect the scope ground?

2. What is the time duration of the pulses?

4. Are those pulses only during switching from 20 to 10 meters?

5. What is the significance of the long vs short pulses?

6. What pulses occur during a change of freq within a band?

7. Is this kind of info available elseqhere>


----- Original Message ----- 
From: rstealey 
Sent: Thursday, June 18, 2009 5:06 AM
Subject: [SteppIR] Re: 3 ELEMENT 180 DEG SWR PROBLEM

One thing you can do, if you have a scope is to look at the signals on pins 5-8 
of the RS232 connector. Those are the pins used to activate the director motor. 
Do this by removing the connector, opening it up. Compare the signals you see 
on those 4 pins to the ones you see on 1-4 (the driven element). Use extreme 
caution not to short pins together.
If you switch from 20 to 10 meters, you will see a couple long pulses, and then 
a bunch of short pulses, then some long ones again. About 20 volts peak. Look 
at pins 1-4 to see what they should look like. Any differences means your 
driver chip is probably bad.
I just did this on mine to isolate driver chips that I blew out through 
mis-wiring. All my fault, but I replaced two chips and all is FB now.
You can do this test with a spare unused male RS232 connector if you have one. 
You don't need to have wiring connected to the antenna. Measure between the 
pins and the shell of the connector.
You can do this test and put things back together in about ten minutes.
Rick K2XT

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