On Mon, 31 May 2010 21:00:32 -0400, Tom W8JI wrote:
Something else was going on Jim. Not shielding.
In short,
the antenna used on the analyzer has increasing
sensitivity for a given flux level with frequency.
Agreed. But there's more -- my amp, a Titan 425, has an L network
output, and
Jim,
You say that foam dielectric is more costly and provides no benefit at h-f. If
you are only considering dielectric loss this is true, but the lower effective
dielectric constant allows (requires) a larger center conductor (for the same
overall diameter) which fulfills your big copper
Hi Jim,
I gotta get back to work but..
More likely you changed the impedance presented to the
tank
circuit on the second harmonic.
The coax I was changing was between the K3 and the amp.
When we measure a change in a complex soup of interactions
and fields formed by the interactions, we
One thought. If you're going to operate SO2R and run
power, you should
probably use the bigger coax for the jumper, because the
more robust shield
can help interstation crosstalk. I did that in my shack
for that reason, and
it made a difference.
I'd be very surprised if that had
Thanks all! My K3/10 is almost always running at 5w CW.
I'm really surprised and grateful for the great ears and enormous patience
DXers have shown responding to my puny signal.
I did note that the 70ft run to my dipole via RG213 was right on spec when I
measured it at 0.5db of loss. But the
On Mon, 31 May 2010 18:59:20 -0400, Tom W8JI wrote:
After making dozens of measurements here, I concluded the
major problems I had were from antennas coupling to antennas
(even at 1000 foot spacing) and how connectors were mounted
on radios and amplifiers, and things like BNC and phono
I do have an HP 3590D spectrum analyzer sitting in the
shack, and put a
simple loop on it to look at 2nd harmonics from my Ten Tec
425 amp and 160M
vertical. It was about -44 dBc when I started, and I got
it down to the rated
-50 dBc by doing nothing more than changing coax jumpers.
On Sun, 30 May 2010 15:13:19 -0400, Tom W8JI wrote:
There is some bad information on Internet
about it and some real wild myths,
YES.
That said, some of the misinformation and myth is based on
the use of cheap, no-name junk connectors sold at hamfests and
on the internet, often by
On Sun, 30 May 2010 15:37:23 -0400, Jim Miller wrote:
Thanks all for the input. I'll just run 8X jumpers from my bonding panel to
the K3.
One thought. If you're going to operate SO2R and run power, you should
probably use the bigger coax for the jumper, because the more robust shield
can help
I'm doing some rewiring of my shack and the antenna runs. I'm going to order
some BuryFlex which will be used as the main runs to both of my antennas.
I'm trying to minimize the number and type of connections while doing all
this. I don't yet have any BuryFlex as my previous runs were RG213
I'm doing some rewiring of my shack and the antenna runs.
I'm going to order
some BuryFlex which will be used as the main runs to both
of my antennas.
I'm trying to minimize the number and type of connections
while doing all
this. I don't yet have any BuryFlex as my previous runs
were
Thanks all for the input. I'll just run 8X jumpers from my bonding panel to
the K3. The operating point is on the first floor directly above the
basement service entrance and bonding panel with polyphasers so it will only
be 10ft.
Now to order a bunch of coax and connectors.
73
jim ab3cv
will
be perfect.
Bill W5WVO
--
From: Jim Miller j...@jtmiller.com
Sent: Sunday, May 30, 2010 1:37 PM
To: Elecraft Reflector elecraft@mailman.qth.net
Subject: Re: [Elecraft] Buryflex all the way to K3?
Thanks all for the input. I'll just run 8X
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