I remember that too Ken! I miss SAROC!
And for your SoCal types..
I remember seeing Dick McKay walking around the Sahara in Vegas,
talking into a Motorola mic (with just the coil cord hanging down)
and listening on '94.
This was during SAROC in the 70's
Ken
I know from experience that aluminum oxide is a noise generator under RF
conditions.
-
Or course, silver oxide is conductive, unlike most other oxides.
Building an even splitter is no big deal for 50 ohms. I have cranked out
hundreds over the years. Use a Wilkinson design. FOr two way its two pieces
of 75 ohm coax, cut to 1/4 wave with velocity factor, like rg-179 and a 100 ohm
resistor across the split ports. You even get a little
Building an even splitter is no big deal for 50 ohms. I have cranked out
hundreds over the years. Use a Wilkinson design. FOr two way its two pieces
of 75 ohm coax, cut to 1/4 wave with velocity factor, like rg-179 and a 100 ohm
resistor across the split ports. You even get a little
I am trying to figure out whether I should throw away my old WE 247B KTU touch
tone decoder. Anybody want it?
Museum maybe? Put some pull ups on it and it should not be too hard to do a 12
line to hex converter,
in software. You can't beat the old pot cores and precision caps for
Dang, sounded like a good idea at the time!
Re: EF Johnson CR1010 xtal replacement
1b. Re: EF Johnson CR1010 xtal replacement
Posted by: Paul Finch [EMAIL PROTECTED] wb5idm
Date: Mon Jan 28, 2008 5:23 pm ((PST))
Only one problem, with two of those things it's twice the money I have in
any of my repeaters!
Paul
Does anyone know of an IRLP reflector or node that has non-shuttle mission
audio of the ISS comms on it?
Leaking antenna harnesses...
Man, you guys are soft. I had to put a drip loop in my DB-406 cable.
Otherwise I had to dry it out after every rainstorm. I had a glass bead type N
barrel connector so the water would collect and short it. When the tx signal
strength started to go down, it
Same here. But I have no control head for the motran because I sold it on ebay
for over 500 bucks to some nutball building himself a vintage a police car.
Anybody want the motran? Free to first person at the gate in La Mirada, CA
Note, it has early Cal Crystal Labs xtals in the radio so who
Working on a spectratac package for a link receiver that will always have way
more than enough signal and got to thinking. I know I have run across mods to
defeat the fast gate mode and run in insanely long squelch tail mode
permanently. Old IMTS systems come to mind.
Has anyone ever
I have a spectratac receiver I am refurbing for a friend. It came with a
K-1000 reed installed in the stock tone board. Now I know this calls for a
TLN-8381 reed but the k-1000 seems to work OK. Its sensitive, seems to open on
200-300 hz deviation, seems centered frequency wise. Anybody
Here is my combination rant/contribution to thread drift...
I recently monitored an exchange on my company's technical email list relating
to a guy who had set up an ISDN codec system for a broadcast remote. The
question was, how do I get rid of the delay? I wanted to start acting like
the
Too bad Jim Mann and CA are long gone. I remember walking through those
places and being all inspired with all my dad's money I could spend at age
12. Plus knock myself on my butt trying to make it work. I also remember
the angst I had ripping apart my T44 to build a preamp for my pre-prog
Back in the crystal controlled 1970's I used GE Mastr II and MVP exciter
boards as frequency sources for exactly what you are talking about. They
put out several hundred milliwatts of RF so a combination of resistive
attenuators and cavity filters and in some cases power splitters would bring
My answer would be none of the above. Get a VHF micor and have Kevin do the
220 mod to it. I cannot imagine any of the receivers mentioned coming close
to that in performance.
Good luck,
td
wb6mie
Our group is in need of replacing the receiver on our 220 box and I
wanted to solicit some
The other appears to be a 75 ohm F connection. Ideas???
Its probably a satellite receiver input. L band from a Ku Band LNB. You
should just dike it out and get it out of your way.
td
wb6mie
_
Valentines Day -- Shop for gifts
In fact, it's normal these days that when you see banks of cell antennas on
each side of a structure, each bank feeds a different bank of tx/rx; in
other words, each bank is a different cell site.
They are called sectors. Out here in LA, sites consist of 2, 3 or 4
sectors. On PCS 1950, each
I don't think you are going to be able to model it to your satisfaction with
any software you or I could afford. Perhaps you need to adopt an empirical
approach, put up an antenna and see what you get. Drive test it, take field
strength readings, plot and graph the real world data as much as
Any suggestions as to what would be an ecomonical one to use to shape
a repeaters output audio after a controller? The audio seems to set
flat state but way too much on the high side.
I have adapted parts of some of w2ihy's stuff to do similar things. I have
also used Mackie and Behringer
synchronize the clock to GPS time... but that's a whole new topic!
It would be more cost-effective to put an 120 VAC input on the controller
for the purpose of picking off the 60 Hz reference. Ever wonder why your
50 year-old AC-powered clock keeps perfect time (between power failures,
I have done many of these in the past. With a Phelps Dodge Miniplexer they
made great full duplex ham phones in the 70s and 80s. Somewhere in my
garage, I have a 558 built up as an emergency repeater.
Its as simple as eliminating the switching transistor that turns off voltage
to the
Thanks for the link. I do not know what it is but I need a ballpark figure
to design around. Its already installed but I have no idea what it is, I
have not seen it yet. Its for a receiver link between two parts of a
multicoupler between two buildings. The run is around 500 feet. I am
Can someone estimate for me, the approximate loss of typical half inch cable
TV hard line at 450 mHz?
tnx
td
wb6mie
Yahoo! Groups Links
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More details at http://wa6tdd.tripod.com and it's really
worth reading. And wait for the photos to load - they are
worth it as well (just for the photo of WA6ITF 40 years
ago). The Jampro story is just under his picture.
I think he would have been WA2HVK at that time. Although his 6 land call
Did anybody ever cut a board for the LM-386 audio buffer project on the
repeater builder web site? I am getting tired of vector boarding the
things.
Thanks,
td
wb6mie
Yahoo! Groups Links
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*
I have to agree on all points. In my limited travels, I have seen a lot of
questionable plating and dielectric materials showing up on all sorts of RF
equipment. If its black with silver underneath, I would rather dig it out
of the junk box and use it rather than going to an electronics store
the status tone and simply not use constant link transmit?
Kevin
tony dinkel wrote:
Kevin, I did that a bunch of years ago both commercially and amateurly.
Equipment involved was native motorola, ge and ef johnson. Did it on
420,
960, 1296 and the 2.5watt, 12.5kHz 450 channels. I built an add on COR
Kevin, I did that a bunch of years ago both commercially and amateurly.
Equipment involved was native motorola, ge and ef johnson. Did it on 420,
960, 1296 and the 2.5watt, 12.5kHz 450 channels. I built an add on COR
board to the link receivers and forced an SQM disable to the comparator.
I have run into things like that on 800. Just after the band was turned on
the FCC had not gotten rid of all of the translators between tv channels 70
and 83. I had a receiver on 807.2375 that had an odd, week, dirty sounding
carrier that would come and go. I went up with antenna, preamps,
I have been pulling my hair out (I don't have that much more to go) over an
old Celwave 6 cavity 526-4 pass reject duplexer. I can get the notches to
tune properly one by one but when I put it all back together it just does
not seem to sum out right. Is there a procedure someone can point me
All, thanks very much for the input. I was already in the process of
rebuilding the interconnects to RG-214 with crimp on RFS connectors as
a punt. That old RG-8 was hard as a rock.
I also think my problem with the notches is that I do not have enough
dynamic range on my ifr 1600 to see the
Is that like the question: what is more accurate...a clock that is stopped
or one minute fast?
Way back when, I had an SCR-522 2 meter transmitter that had a bit too much
crystal drive. So much in fact, that the crystal would heat up excessively.
Of course it would be drifting to beat the
any one of y'all got a johnson 550 manual. I'm trying to get one powered up
for a friend and have no power cord. I have ground on pin 1, +12 on pin 4.
Where else do I need to put +12?
tnx,
td
wb6mie
Yahoo! Groups Links
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I use an MSF-5000 as my pre-delay ifb for kfi. It has been keyed on 24/7/365
since the early 90's and the only time out it has is one of the final xstrs
gives up every 3 to 5 years.
td
wb6mie
kpk405
kfi am 640 more stimulating talk radio
I work for a TV station, and we were planning to use
I do not think caution is in order. I have dealt with a bunch of crystal
companies over the years, ICM is the most über alles. I ordered my first
pair from ICM in the 60's for my Hammerlund Outercom, think I paid $4.50 a
piece for them. I considered it a lot of money at the time but have
Anybody out there possibly have a schematic scanned for a system 90 single
tone add on board for a mitrek control head TLN4526A4? I would settle for
just the pinouts but would gladly shoot someone some funds on paypal if you
could come up with some scans.
Please reply direct.
td
wb6mie
Date: Wed, 05 Jan 2005 08:04:08 -0800
Mime-Version: 1.0
Content-Type: text/plain; format=flowed
Oh man, those radios brought up nightmare memories!!! Only one I can think
of that is worse is the Johnson 557 UHF radio.
So whats wrong with a 557? I think I have worked on more of those than any
Sheese!! Are you sure you arn't thinking of RG-393?
td
kfi
wb6mie
That's cheap! Last time I bought some it was around $5 / foot.
Neil
Yahoo! Groups Links
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* To unsubscribe from this
If you want to do duplex measurements here is what I would do. Look for an
IFR 1000S for your primary service monitor. Then look for an IFR 500.
Those things should be cheap and plentiful by now. Use the 500 as the
source and the 1000 as your calibrated receiver. Acquire some directional
During the early seventies, I was working for a 2-way radio shop in the Los
Angeles area.
One very hot summer day, one of our customers complained his base station
had apparently quit so I was dispatched to repair it. The base was in a
unventilated two car garage on a hill top.
Sounds like
It was kind of a joke in the 70's,,,
We all had Motracs, 8 tracks and Japtracs.
td
Message: 16
Date: Sun, 18 Jul 2004 01:44:39 -0500
From: JOHN MACKEY [EMAIL PROTECTED]
Subject: Re: Just a couple of dB loss you say?
In my hay-day I had the following all installed in a 1978 Camaro
8
Somewhere around I remember having a brand new one but I am going to have to
dig. I always considered them a bit of a toy but they held up pretty good
in trash trucks for a plastic radio.
Have you heard any predictions for the wx for Gravity Probe B monday? I
would like to watch but 200
Message: 1
Date: Tue, 30 Mar 2004 08:27:04 -0500
From: Kevin Custer [EMAIL PROTECTED]
Subject:
tony dinkel wrote:
Having trouble retuning a 633 8A duplexer from 10 mHz to 5 mHz split.
Insertion loss seems to be excessive. Does anybody have any experience
with this model
Having trouble retuning a 633 8A duplexer from 10 mHz to 5 mHz split.
Insertion loss seems to be excessive. Does anybody have any experience with
this model in this circumstance?
td
_
Get rid of annoying pop-up ads with the new
I have a 19D424786G4 Rev A PA deck that I am working on for a friend. It
has a burned up 2 watt resistor with a 27 pF across it. Does this mean one
of the PA xstrs is toast? Can these things be gotten? Suggestions?
td
wb6mie
_
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