[Collins] Power Inverter Question

[Steve Lenaghan VE4LR]

Dan

I would try to scope the inverter under a safe load, like a lamp.  Modified
Sine Wave could be anything from a dirty sine wave to a square wave.  A
quick test is a touch lamp.  They don't work on less than a reasonable sine,
all you get is full bright since there is no side of the wave to switch on.
If you have an isolation transformer it will help smooth the raw edges and
protect the 51S.

As for monitoring pick a time when the band is dead that way you will be in
all probability be picking up only local interference.  Also I would take my
measurements up close to the tower and then at a distance.  At 1300 feet the
possibility of picking up something else is too great.

It will also depend on the frequencies they will be using and if it a
sectored site.  Most new cell sights are low power, directional antennas and
not really elevated, it allows for better frequency reuse.  In all reality
I'd be more concerned about what your power levels could do to them.

73 Steve VE4LR

-----Original Message-----
From: collins-bounces at mailman.qth.net
[mailto:collins-bounces at mailman.qth.net]On Behalf Of Danny Lunstrum
Sent: July 26, 2006 12:01 PM
To: collins at mailman.qth.net
Subject: [Collins] Power Inverter Question


Good Afternoon Group,

US Cellular is planning on installing a cellphone site approximately 1300'
from my amateur radio/short wave listening station and I am very concerned
about possible interference.

In visiting with Mike Gruber at ARRL, he suggested that I take a portable
communications receiver and monitor the amateur and short-wave bands with
the rig around     1300' from a cellphone site and see what kind of
interference I can pick up.

My question concerns using a 51S-1 receiver and powering it from a power
inverter with a 12v input.

The two that I looked at stated that the output was a "modified sine wave
output."

Would it possible to damage the power supply section of the 51S-1 if I used
a 12 VDC to 115 VAC power inverter to power it?

Thank-you for your thoughts,


Dan Lunstrum
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