[amsat-bb] Proximity of HF vertical to my satellite antennas

[jeff griffin]

Hi Bob these questions would be better answered at the TowerTalk group at
contesting.com. When I build my last house I asked many questions about
grounding there. When I was having the house built I actually took into
account, from the ground up(pun intended) a grounding system. Lots of good
knowledgeable people there...


73 Jeff kb2m

-----Original Message-----
From: AMSAT-BB [mailto:amsat-bb-bounces at amsat.org] On Behalf Of Bob Hammond
via AMSAT-BB
Sent: Thursday, October 24, 2019 11:26 AM
To: Kevin
Cc: amsat-bb at amsat.org
Subject: Re: [amsat-bb] Proximity of HF vertical to my satellite antennas

Thanks all.

What do you all do for a station ground and lightning protection?

Bob
W7OTJ

On Thu, Oct 24, 2019 at 8:00 AM Kevin via AMSAT-BB <amsat-bb at amsat.org>
wrote:

> Bob,
>     Some external preamps like to put a couple diodes back to back on
> the input to prevent blowing out the preamp, they will rectify his
> signal and create hash, it wont hurt anything but will interfere.
> You would have to look at the schematic of your rig to see if it has
> similar front end protection.
>     My HF vertical  is 50 feet from my sat antennas and 120 feet from
> another set of sat antennas and I get into both and create  a wideband
> hash with 100 watts, 500 watts totally wipes out sat reception.
> I have been running this way for years and have yet to damage a preamp
> or rig.
> I have had no issues with rotor cables but I do have some clamp on
> ferrites on them.
> YMMV
> 73
> Kevin WA7FWF
>
> On 10/24/2019 06:11, Bob Hammond via AMSAT-BB wrote:
> > My neighbor has a HF vertical (10/15/20 meter trap) that is about 30
feet
> > from my 2M/70/cm/23cm satellite antennas.
> >
> > He currently runs 100W and is planning on going to 200W.
> >
> > Should I be concerned?  Will the RF get into my feed lines and blow up
my
> > rig?  Or into my antenna rotor cables and fry my controller?
> >
> > I am still in construction mode for my satellite ground station.
> >
> > Bob
> > W7OTJ.
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_______________________________________________
Sent via AMSAT-BB at amsat.org. AMSAT-NA makes this open forum available
to all interested persons worldwide without requiring membership. Opinions
expressed
are solely those of the author, and do not reflect the official views of
AMSAT-NA.
Not an AMSAT-NA member? Join now to support the amateur satellite program!
Subscription settings: https://www.amsat.org/mailman/listinfo/amsat-bb