[1000mp] Deaf Mark V

[Harold Mandel]

Gentlemen,

Industrial Communication Engineers, Ltd.  (ICE)
<<  http://www.iceradioproducts.com  >>
800 - 423 - 2666  << help at iceradioproducts.com >>
manufactures a series of antenna line
static protectors that are rated up to 8 KW, PEP.

These items are manufactured for end-fed long wires, 
balanced-line feeders and for coax-fed antenna feed
systems. They continuously discharge static buildup, 
have negligible insertion loss, may be mounted on 
exteriors because of their NEMA 3 cases, and can be 
cascaded anywhere in a feedline system. There are 47
different configurations offered.

In addition, the website offers a section called "Special 
Publications," which has numerous articles and DIY
procedures for those wishing to audit and remediate
EMP conditions that may damage sensitive electronics.

Their property is to discharge the static build-up by a
continuous path to ground that is isolated from the RF
signal going through the feed system, and augments
this with additional gas-discharge protection rather
than relying only upon a gas-discharge device that
has a threshold value that will deteriorate, and that
might allow smaller charges to not flow to ground.

It is worth employing a static discharge device
for every antenna and radio. The tiny components in 
a solid state radio will dissipate EMP, but the deleterious effects
of the radio's doing this will be borne by the entire solid-state
architecture and may eventually lead to catastrophic failure
of the receive and transmit features as microscopic semiconductor
junctions fail because of pulse-puncture.

Hal Mandel
W4HBM

-----Original Message-----
From: 1000mp-bounces at mailman.qth.net [mailto:1000mp-bounces at mailman.qth.net]
On Behalf Of Steve Fraasch
Sent: Tuesday, October 17, 2006 11:52 PM
To: All about Yaesu 1000mp; 1000mp at mailman.qth.net
Subject: Re: [1000mp] Deaf Mark V

Same thing happened to mine last year after a snow squall passed thru in the
spring, whenthe antenna was connected.

At the time, I thought a PIN diode blew, but it turned out to be a
transistor, I am pretty sure it was Q1045.

73,

Steve, K0SF





-----Original Message-----
>From: Kelly Jones <kjones at virtualcohesion.com>
>Sent: Oct 17, 2006 10:39 PM
>To: 1000mp at mailman.qth.net
>Subject: [1000mp] Deaf Mark V
>
>Hello MPers...
> 
>After taking 2 hours to get home tonight due to snow in what would
>normally be a 30 minute commute I was greeted with what feels like a
>deaf Mark V Field.  I'm listening to 75/80m and the background noise
>goes to S0.  I hear signals, but it just feels like they should be
>stronger than S8 or 9.  
> 
>Listening around on 40, the FB sigs that are usually 20 over barely hit
>S9.  It's almost as though I have some attenuation inline.  I "popped"
>the relays a few times thinking something might be stuck there, but no
>dice.  Anybody have any suggestions?  My thought is snow static built up
>on the shunt fed tower and when I switched the switchbox, that charge
>went into the radio.  However, in that case I would have thought all
>receive would be dead, not just attenuated.
> 
>73
>Kelly - N0VD
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