Very interesting theory. I am teaching SWR at present to my third
year college students. Could be a good discussion point since they
have already studied power factor. However, SWR can exist with a
purely resistive mismatched load, so it needs a bit of modification to
take all into account.
73
Good point Nigel. Back in the '60s I designed a video distribution
amplifier for receiver video to tape recorders, O scopes and the like
and I matched the input impedance to prevent reflections on the video
line from distorting the signal. The output impedance of my amplifier
was as low as I
At 9/19/2008 21:48, you wrote:
What signal are you using as the COS from the receiver? If you use RUS
you will have a combination of the squelch and the CTCSS detect. The two
are anded together so that both have to be present for RUS to be active.
If you are using only the detected CTCSS you
All:
Kind of off topic, but thought I'd ask. We have 3 GM300's we got for
our emergency communications trailer but we didn't get microphones. I
have two desk mics that came with a couple repeaters we got a bit ago
but we'd really like Hand mics for this application. I'd trade the
desk mics (real
Folks,
I'm in need of the manual for a Motorola R1011B power supply. Anyone have a
spare or a good
electronic copy? Please reply direct if you have something that may help me.
Thanks very much,
Gary,
The manual for the R1011B bench power supply is 6881069A94, which is still
available for purchase from Motorola Parts for about $24. Call 800-422-4210
to order.
I saw a few used manuals for sale on eBay, listed as 68P81069A94 for about
the same price, not including some significant
Thanks Eric, I didn't know the part number for the manual and a Resource Center
search on MOL turned
up nothing as did a parts search. I'll look again.
Gary
-Original Message-
From: Repeater-Builder@yahoogroups.com [mailto:[EMAIL PROTECTED] On Behalf Of
Eric
Lemmon
Sent: Saturday,
Too many times, the available on-line Motorola resources are 100% useless.
I find the human touch does a lot better.
Call 1-800-422-4210, punch your way through to Parts ID, and ask the person for
the right manual and/or part numbers. They have resources that aren't available
to the
You can use microphones for MaxTracs in your GM300 radios. I'm pretty sure they
will also work in the DeskTrac. EBay always has dozens for sale. It's just a
matter of whether you want new or used.
Some MaxTracs do drift. I've actually seen them go as much as 300 Hz off
frequency while
By the way all, I have a new in the box/unused Motorola model T1013A load
resistor (dummy load)
available. Rated 150w continuous, 300w intermittent up to 1Ghz. These are still
current and list for
over $400 but I'll let this one go for $100 + shipping just to get it out of
here and into the
I found a junk TPN1110B power supply in my garage, and removed the two heavy
diode assemblies. They are, indeed, 1N3492R diodes that are press-fitted
into a small aluminum plate marked 64B83562D01 and ink-stamped 1V80739B59.
Yes, the last digit is a 9 not a 7 on both of these diode assemblies.
No
Well, I got this thing all reassembled and tuned up on the new frequency
pair. a fellow ham (who used to work for the local Motorola shop) came over
with his service monitor and we tuned and tested the system. It is still
not passing PL to the transmitter. Some PL bleeds through from the
Nate - I still remember the album sleeve for the Rolling Stones' Let It
Bleed album...
Lower right corner: THIS RECORD SHOULD BE PLAYED LOUD
Mark - N9WYS
-Original Message-
From: Repeater-Builder@yahoogroups.com On Behalf Of Nate Duehr
Bob M. wrote:
He was into the hard rock stuff
Yes standing waves can exist with a pure resistive load on a line but the
mismatch of the load with the line impedance creates a reactance (depending
on line length).
A transmission line must be long enough (wavelength wise) for standing waves
to exist.
A short line (wavelength wise) like an
Anyone needing an original owners guide for the Midland 13-509, email me
offline.
Bruce
K7IJ
**Looking for simple solutions to your real-life financial
challenges? Check out WalletPop for the latest news and information, tips and
calculators.
Mark,
I could not find the previous messages on your thread, so please restate the
module numbers of the Master Decoder and Unified Chassis Backplane that you
now have. Do all of the backplanes have the same number stamped in black
ink on them? The number I am referring to is the number stamped
16 matches
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