Since I'm way more into RF than industrial power distribution, I've
always been able to think of power factor on the electrical power
grid in terms similar to antenna system reflections, which are
commonly measured in terms of SWR. After all, both are AC systems
where the voltage and current
SO what I'll do is use the VNA to measure the loop's XL, calculate a
starting point for coax lengths based upon it, and make a few other
cables which are slightly different in length. Then I'll see what
works best.
The problem is that the XL of the loop in free space (unloaded) really
Spinning disk meters are becoming a thing of the past. However, I believe
that very few utilities are billing residential customers for kVAR. Many do
charge residential demand and time-of-day rates. Eric, you may want to
comment further.
Chuck
WB2EDV
- Original Message -
As I
At 9/15/2008 16:03, you wrote:
Bob,
All standard residential utility meters read out in kilowatt hours. That
is the basis for their tarrifs and billing. You are charged on the
actual kilowatt hour use. The ups reading lower on actual battery
operation MAY mean the charger is disabled and all you
I have a site where for many years the only load was a battery charger feeding
a battery to power up the equipment. For many years the power meter DID NOT
MOVE! It started moving when I substituted a GE Mastr II base station power
supply with backup battery.
My theory (correct me if I am
More likely the meter simply failed to register well on light loads. It
doesn't happen with the newer meters.
Chuck
WB2EDV
- Original Message -
From: Jim Brown
To: Repeater-Builder@yahoogroups.com
Sent: Wednesday, September 17, 2008 10:06 AM
Subject: RE: [Repeater-Builder] Volt-Amp
Thank you Eric Lemmon ! Your explanation is the most precise I've read thus
far.
The last line of your last paragraph said what folks want to hear. I
started to respond
to this thread earlier, but after a few minutes of organizing my thoughts,
my aging pea-brain
said, Forget this and go get
Excellent points, Jeff, and well taken. Too many subtle interactions
for a concise solution.
Still, some night in the near future when things are running
smoothly and all we're doing is babysitting things, I'll run some
tests with the VNA and see if measuring the XL of the loop and
Any 'non-messers' out there?
Cheers Dave UZN
--- In Repeater-Builder@yahoogroups.com, dave_g7uzn
[EMAIL PROTECTED] wrote:
There may be some that think that I have lost my mind! but I would
like
to swap my working CAT300 with copy of manual for a working
One of our engineers had a factory tour of EMR.
They did NOT calculate critical cable lengths, rather they had a pile
of various length cables that they swapped in until it met specs.
They were NOT optimized.
That same engineer finally got a SWAG from them that the loops in the
EMR cavities
Hi guys .just been following this thead .When you talk about 1/4 wavelength
is there a formula available to make these coax lengths.
I found a calculator and I am wondering if this is the right one http://www
csgnetwork.com/freqwavelengthcalc.html
Going off that 1/4 wavelength for my coax's
Howdy! We're getting ready to move a repeater to a taller, more robust home.
We have access to a run of CableWave 1 5/8 Heliax. Here's our question:
Will an Andrew H7PNF work with CableWave HCC158-50J170 Heliax?
If not, what Andrew connector will work with CableWave HCC158-50J170 Heliax?
Model C73CXB7106B with extra C23CXB7106BSP01 receiver.
Please contact off list for more details.
Randy
WB0VHB
Yes, SWR is a problem for long power distribution lines, but only the very
long ones.
There was a case I think in Canada where they ran into this problem. The
transmission lines from one side of the continent to the other was an odd
multiple of a quarterwave (1,250 km). Since a quarterwave acts
Good Evening,
I am trying to repair two TPN1110 power supplies. One has bad caps; the
other has bad rectifier diodes CR1 and CR2.
I tried looking up the part #s in the manual via Motorola Online, but
the numbers are invalid (no suprise!).
Anyone have any recommendations as to a suitable
Hi Mark, I'll weave some comments---
I've always understood poor power factor to be a problem because the
generator and distribution system needs to carry higher currents to
deliver
the same energy into a poor load. That's a problem because the power
companies either suffer higher resistive
Eric,
Kudos on a great explanation
Doug
- Original Message -
From: Eric Lemmon
To: Repeater-Builder@yahoogroups.com
Sent: Tuesday, September 16, 2008 11:59 PM
Subject: RE: [Repeater-Builder] Volt-Amp (Re: APC UPS Charging Power)
John,
You are correct that when the
To answer the question, I don't.
Look at it this way. The AC supply to your house, for example, is a
low impedance; it can supply hundreds of amps (the transmitter). The
100 watt lamp (antenna/load) in your house is a relatively high
impedance compared to the supply. There is no impedance
Ray,
Those Andrew connectors will not fit. The configuration of the inner conductor
is different.
I do not know if Andrew makes a compatible connector. I have a few Cable Wave N
Male
and female connectors. Contact me off the list.
for what it's worth Andrew connectors will fit cable wave in
Group,
I have a set of crystals for a Kendecom (MCS) Mark 4 repeater which I
no longer need. T145.210 - R144.610
Let me know if you are intersted maybe for trade or sale or...
Collin
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