[Kenwood] TS-850SAT receiver noise problem

[Clif Holland]

Q49 on the RF unit

Clif Holland KA5IPF
www.avvid.com




----- Original Message ----- 
From: "Brian Mileshosky" <n5zgt at swcp.com>
To: <kenwood at mailman.qth.net>
Sent: Sunday, November 22, 2009 5:44 PM
Subject: [Kenwood] TS-850SAT receiver noise problem


> Hi Everyone -
>
>
>
> I'm having a receiver noise issue with my TS-850SAT, and I'm looking for
> ideas on what it might be.  My 850's serial number is 30-million series.
> According to some (unverified) information I found on the web, it looks 
> like
> this might correspond to having been built in 1991.
>
>
>
> Here's the problem:
>
>
>
> --- My 850 is experiencing loud, intermittent, crashing, static-like pops 
> in
> the receiver.  Sounds like static crashes from nearby lightning strikes.
>
> --- I've confirmed that the noise is originating from within the radio, 
> and
> no external sources, as I've operated the radio with a 50-ohm load 
> connected
> to the antenna port (as well as an open), on battery power, and no cords 
> or
> cables other than the power cable attached to the radio.the crashes still
> occur.
>
> --- The crashes register on the S-meter, which tell me that it's occurring
> in the receiver chain prior to when signal is coupled into the S-meter.
>
> --- The crashes get louder (and stronger on the S-meter) as I tune to 
> lower
> frequency bands, which makes sense.
>
> --- I have not been able to correlate the occurrence of this noise with
> temperature.  Seems somewhat random as far as when the problem begins 
> after
> I turn the radio on, and also when the crashes occur.they range from once
> every 10 sec to sometimes more than once a second.
>
> --- I've looked at each of the LOs in the receiver with an o-scope and 
> they
> are both on frequency and look clean.
>
> --- Poking elsewhere in the receiver chain with my o-scope hasn't shown 
> any
> apparent noise at the time I hear crashes on the speaker.
>
>
>
> Any ideas?
>
>
>
> Thanks and 73,
>
> Brian N5ZGT
>
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