[Yaesu] FT 857D & ATAS120 Tuning (Additional Testing)

[Jay Eimer]

I don't know about yours, and I don't know what year it was or what engine
it had, but the other day I heard a terrible whine in my HF mobile.  It got
worse and worse for a few seconds, then I got passed by one of the newer
Dodge pickups.  The whine then immediately started fading, but was still
audible at 10 or 12 car lengths.

I thought about turning him (or Dodge?) in to the FCC for a part 15
interference violation (hi, hi).

Jay 

-----Original Message-----
From: yaesu-bounces at mailman.qth.net [mailto:yaesu-bounces at mailman.qth.net]
On Behalf Of Cliff Warrick
Sent: Saturday, November 19, 2005 17:41
To: yaesu at mailman.qth.net
Subject: [Yaesu] FT 857D & ATAS120 Tuning (Additional Testing)

The antenna tunes fine on 10, 12, 20, and 40 meters - as long as the truck's
engine is not running.  With the engine on, it stops tuning as described
before.
The volt meter on the display shows 14.4 volts with the engine running.
That's fairly normal.  One theory is alternator whine voltage on the dc line
causing interference.  Vehicle is a 2005 Dodge Ram 1500 with the 5.7 L
engine.

The antenna will not tune on 15, 17, or 6 meters (even with the engine off).
It starts then stops within 1 second.  17 meters doesn't surprise me since
the literature with the antenna states it wasn't specified for operation on
this band.  Why it will tune on 12 meters (not specified for this band
either) but not 15 is a mystery.

 

Love this trouble shooting :-))

 

Cliff

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