[MRCA] Antenna(s)

Sun Jun 16 23:48:56 EDT 2019

I have found getting the antenna as far as possible away from my house, and
my neighbors is the best bet.

If you are in a real noisy environment, you can always cheat and use a
remote SDR receiver.

You can also make an NVIS antenna as distant as possible from the local
neighborhood noise sources.   I have a low 80 meter loop 80 feet or so
behind my house which doesn't hear as well as a higher antenna, but it
provides a better S/N which makes all the difference during receive.   You
can also try a magnetic loop and null out the direction where the greatest
noise exists..  

In my experience, loops are a bit quieter.  Do they radiate better, I doubt
it, but in my cases certainly help with listening.

Steve, kd3ht

From: mrca-bounces at mailman.qth.net [mailto:mrca-bounces at mailman.qth.net] On
Behalf Of Ray Fantini
Sent: Sunday, June 16, 2019 1:16 PM
To: mrca at mailman.qth.net
Subject: Re: [MRCA] Antenna(s)

Resonant antennas work best, noise is just a fact of life in the modern
world. not just TV sets but wall warts and everything else. In my QTH found
that the washing machine generates noise that sounds like digital in the 60
meter band and that cheap Chinese eight foot florescent fixtures generated
wide band noise that wen up to around 120 MHz.

Some you can get rid of like the lighting fixtures but others are not as
easy.

 I try to keep all the Ham stuff at one end of the house and the antennas as
far from everything as possible. Have the advantage of living in the
woodland swamps of Delmarva outside of town with no neighbors so that helps
but find that best operation can be from using a good antenna and the M151
with radios aboard.

Field day is coming up, wonder if anyone will be doing an all military radio
operation? I do a lot of field operations every year but somehow have not
done the Ham Field Day event in years, maybe decades. Have lots of resources
available just dont have the desire to hang out with the local community.

Ray F/KA3EKH

  _____  

From: mrca-bounces at mailman.qth.net <mrca-bounces at mailman.qth.net> on behalf
of J Mcvey via MRCA <mrca at mailman.qth.net>
Sent: Sunday, June 16, 2019 11:10 AM
To: Steven Gajkowski; Peter Gottlieb
Cc: mrca at mailman.qth.net
Subject: Re: [MRCA] Antenna(s) 

I think any RESONANT antenna will be more noisy. All of those so called
"multi-band " have less noise because they are less effective at the
operating frequency.

If you live in a very populated area, it may be difficult to impossible to
get rid of all the noise. One of the big offenders is the cheap TV power
supplies. Plasmas were the worst radiators, but fortunately they are mostly
out of production now.

My vhf rig would break squelch with electronic noise as I passed certain
establishments like gas stations and bars.

That being said, Have you checked for noise sources within your own home?
Simple devices like automatic night lights and dimmers can cause big noise
issues.

On Sunday, June 16, 2019, 10:51:39 AM EDT, Peter Gottlieb <kb2vtl at gmail.com>
wrote: 

I put up a loop and all it picked up was noise from the neighborhood. I
think it is different under different circumstances. Maybe it would work in
his situation. 

Peter

On Jun 16, 2019, at 10:26 AM, Steven Gajkowski <kd3ht at epix.net> wrote:

Do you have a tree in each corner, 3 corners, put up a loop.   May help with
some of the noise you get too! 

Steve

From: mrca-bounces at mailman.qth.net [mailto:mrca-bounces at mailman.qth.net] On
Behalf Of W2HX
Sent: Saturday, June 15, 2019 11:25 AM
To: mrca at mailman.qth.net
Subject: [MRCA] Antenna(s)

Hi friends,

Its been about 10 years since I had a proper horizontal antenna at the QTH
since my old OCF dipole went deaf and then broke. In response I put up a
vertical which I think has some real DX potential once I can figure out the
source of some serious QRM.

Today I had some tree guys trimming a bunch of things for us and while they
were here, I had them put a pulley and some Mastrant-M 860 lbs. paracord up
in a tree about 80 feet.  

Unfortunately the arrangement of trees on the property is really not
conducive to wire antennas. I have two trees that go from one corner of the
property to the other corner diagonally, about 195 feet apart.  I had an OCF
dipole between them and it ran above the house. This worked out pretty well
because the feedline dropped right down over the house near the chimney.

I was thinking of running the same configuration, but this time with a
messenger line between the trees to keep all of the force off the radiating
elements themselves. In this case, one side would be up 80 feet (pulley
mentioned above) and the other about 35'.  This arrangement is still in the
running.

Others have suggested that I put the center point of an antenna in this 80'
tree. I am more seriously considering this arrangement since I think getting
the center point as high as possible is beneficial but the antenna elements
would not 180 degrees but maybe 90 degrees. I have had some suggestions that
this might not be so bad and that it might be best to have the two ends
slope down. I will have to see about that.

Well anyway with a good pulley 80 feet up at least I will have some options.
More planning to come!

73 Eugene W2HX

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