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intermittent intercom

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Erich_Weaver(at)urscorp.c
Guest

Posted: Wed Jul 28, 2010 7:53 am Post subject: intermittent intercom

Feeling dumb about this question, but what the heck. My SL-40 radio is wired to a PS Engineering PM1000 II intercom.  Everything initially worked well, but the intercom function is now intermittent from the pilots microphone side only.  Transmit and reception are still fine.  I cleaned the headphone plugs and corresponding socket contacts with no change.  I have also made an initial inquiry with PS Engineering, who indicated that the intercom circuit was dead simple and the unit itself was very unlikely to be the problem.  However, I have now realized that I often can temporarily fix the problem by turning the intercom power off, then back on once or twice.  Doesnt that in itself indicate that the problem is indeed internal to the intercom?  Given those symptoms, is there really anything else to check before sending the unit back to the manufacturer?

 

 thanks

 

 erich

   [quote][b]

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dalamphere(at)comcast.net
Guest

Posted: Wed Jul 28, 2010 8:44 am Post subject: intermittent intercom

Erich,

  

 I have that very same intercom installed in my  Wittman Tailwind - connected to a KX125. While they (PS1000II) are a little more  expensive than other brands, they are really good quality and work really well -  even in a noisy cockpit. One thing I found out debugging my installation is the  need to keep the jacks isolated from the aircraft's ground. It's really picky  about that. You might verify those mike, headset sockets are not contacting  ground (and any socket contacts that could be shorting out to each other or  ground). Also check the aux mike and headset sockets (that you can use when the  intercom is removed).

  

 Maybe you have an intermittent short to ground  somewhere in your installation.

  

 I have to agree that it is doubtful the intercom  unit is faulty - possible, but not likely.

  

 Hope you find the fix!

  

 Dave L.

 N365DL

  

 [quote]   ---

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bakerocb

Joined: 15 Jan 2006
Posts: 727
Location: FAIRFAX VA

Posted: Thu Jul 29, 2010 3:03 am Post subject: intermittent intercom

7/29/2010



Hello Erich, You wrote:



1) "Doesnt that in itself indicate that the problem is indeed

internal to the intercom?"



Not quite.



2) "Given those symptoms, is there really anything else to check before 

sending the unit back to the manufacturer?"



Yes, make absolutely sure that it is not a headset problem. I trouble shot 

my intermittent PS intercom / radio system extensively and communicated with 

the PS factory who agreed to let me send it to them for a rather expensive 

set fee for checkout and repair. But luckily before I sent it off I 

discovered with a headset swap that I had an intemittent wire connection 

inside one of my headsets.



Please let us know what fixes the problem.



'OC' Baker Says: "The best investment we can make is the time and effort to 

gather and understand knowledge."



PS: The Lightspeed headset company did a superb job of repairing and 

updating the long time out of warranty faulty headset at only the cost of 

shipping it to them -- great customer service.



======================================================



Time: 08:53:22 AM PST US

Subject: intermittent intercom

From: Erich_Weaver(at)urscorp.com

Feeling dumb about this question, but what the heck. My SL-40 radio is

wired to a PS Engineering PM1000 II intercom.  Everything initially wor

ked

well, but the intercom function is now intermittent from the pilots

microphone side only.  Transmit and reception are still fine.  I cleane

d

the headphone plugs and corresponding socket contacts with no change.

I

have also made an initial inquiry with PS Engineering, who indicated th

at

the intercom circuit was dead simple and the unit itself was very unlik

ely

to be the problem.  However, I have now realized that I often can

temporarily fix the problem by turning the intercom power off, then bac

k on

once or twice.  Doesnt that in itself indicate that the problem is inde

ed

internal to the intercom?  Given those symptoms, is there really anythi

ng

else to check before sending the unit back to the manufacturer?



thanks



erich

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