http://groups.yahoo.com/group/Repeater-Builder/message/98899;_ylc=X3oDMTJxM
XBnc3YwBF9TAzk3MzU5NzE1BGdycElkAzEwNDE2OARncnBzcElkAzE3MDUwNjMxMDgEbXNnSWQDO
Tg4OTkEc2VjA2Rtc2cEc2xrA3Ztc2cEc3RpbWUDMTI2ODgwMDcyMw-- Re: Copper pipe
rather than 2/0 copper wire
Posted by: Eric Lemmon
was changing frequencies and now my repeater is down. Any
help will be greatly appreciated, contact me at jack dot davis at engineer
dot com and I can send you PayPal or cash.
Thanks,
Jack Davis
K6YC Sacramento
the most auction money. DTV in low band VHF is marginal at best
due to impulse noise and interference.
Jack Davis
K6YC
Chief Engineer
KTXL-TV/DT
anyone check the website or do a google search anymore??
http://www.repeater-builder.com/zetron/zetron-model-38a-inst%20manual-025-9043y.pdf
Scott
Scott Zimmerman
Amateur Radio Call N3XCC
474 Barnett Rd
Boswell, PA 15531
- Original Message -
From: Jack Davis
To: Repeater-Builder
Does anyone have the schematics for a Zetron Model 38A repeater controller?
The pages are blank in my manual and I need to fix it.
Thanks,
Jack
K6YC
I looked up the numbers for the PURC / MSF 5000 switches and they are:
90 degree CK Part Number 7107MD9AV2BE Digi Key CKN1174-ND $7.20 ea
Straight CK Part Number 7101SD9V3BE Digi Key CKN1043-ND $6.80 ea
Jack
K6YC
The switches are NLA from Motorola, but Digi Key has the right one
The switches are NLA from Motorola, but Digi Key has the right one except it
has a shorter bat handle. It works fine and fits the mounting holes on PC
board exactly. The hardest part is getting the front panel off the tray
without breaking any of plastic tabs that hold it on. If I was at
Does anyone have a service manual for a Ramsey COM-3 service monitor? I have
one that works but the signal output falls off at lower frequencies. It is
fine above 700 MHz but drops 15 db at 150 MHz. I would certainly pay for a
copy.
Thanks,
Jack
K6YC
I have a Sinclair ResLock 900 MHz duplexer that I am trying to retune to
902-927 MHz. It was on 941.XX with a 3.6 MHz split and the pass cavities tune
up just fine but the notches do not make it to the 25 MHz split. Has anyone
made one of these work in the 25 MHz split used in the Ham band? I
Repeater Builder
- Original Message -
From: Jack Davis
To: No Reply
Sent: Friday, December 07, 2007 9:34 PM
Subject: Re: [Repeater-Builder] Digest Number 5925
I did remove a full turn off both helical resonators on the output of the
receiver oscillator, they do have a big peak
Do the Mastr II 800 MHz receivers have the tin whisker problems that some of
the other bands do? I have one I converted to 900 MHz and the sensitivity will
not go below 2.2 microvolt's for 12 db of SINAD. I have tuned it right by the
book and it never gets any better. I have not opened up
Repeater BuilderDoes anyone have an RX and TX 1C GE ICOM for an 800 MHz MASTR
II? I am putting up a 900 MHz repeater and need a pair
Thanks,
Jack
K6YC
I dug out my Mocom 10 manual and that is not a valid number for this model.
The frequency range is 25 to 50 MHz in 4 splits, 25-30, 30-36, 36 -42 and 42-50
MHz. They came in 3 power levels, 1.5W, 5W and 25W and had PL and AutoMute
tone coded squelch as options. I have one around here
Forget about it. Those are set up for duplex operation but are so specialized
it would not be worth the effort. The High band IMTS phones only had a single
oscillator element that controlled both transmit and receive. The IF was the
same as the difference between the transmitter and receiver
You need to feed your decoder with discriminator audio. The Micor
de-emphasized audio has little below 300 Hz,
Jack
K6YC
- Original Message -
From: Daniel M LePage
To: Repeater-Builder@yahoogroups.com
Sent: Tuesday, March 06, 2007 10:07 AM
Subject: [Repeater-Builder] Micor
Go to your local Home Depot or Lowes and buy a 100 foot roll of #12-2 or 12-3
copper wire. #12 wire has a resistance of .159 Ohms per 100 feet so if you
hook the Black and White conductors together on one end and then put your power
supply on the other end you will have a high powered resistor
I have to wade in here! The ferroresonant power supplies are horribly
inefficient under light loads. Several years ago we replaced 15 hops of tube
type microwave with solid state. Each repeater site had a Sola ferroresonant
voltage regulator and they all ran slightly warm. After we reduced
The secret is to cut the losses as much as possible. The best way is to mount
the access point or bridge right at the antenna in a weatherproof box and feed
it with outdoor cat 5 cable using power over Ethernet (POE). The RF jumpers
are short and the loss is minimized. It may be of some
That is a TV Electronic News Gathering (ENG) antenna. Most likely a NSI or
Nurad Super Quad model. They have been around for a long time and there are
lots of them around. Inside the radome is a fiberglass cosecant squared
antenna that is about 4 feet tall with a CP antenna feed mounted out
The isolator between the PA and the duplexer is fine, but the one between
the antenna and the duplexer would only work with a 2 antenna repeater. In
a single antenna system most of the received signals would end up in the
reject load of the isolator between the antenna and the duplexer. If
Message-
From: Repeater-Builder@yahoogroups.com
[mailto:[EMAIL PROTECTED] Behalf Of Jack Davis
Sent: Friday, January 27, 2006 8:33 PM
To: Repeater-Builder@yahoogroups.com
Subject: [Repeater-Builder] Web Site Down?
Is the RB web site down? For some reason I can not get to it tonight
Would you believe Whackyville, between Davis and Fairfield?
Jack
K6YC
- Original Message -
From: Neil McKie [EMAIL PROTECTED]
To: Repeater-Builder@yahoogroups.com
Sent: Monday, January 23, 2006 3:01 PM
Subject: Re: [Repeater-Builder] Re: STATION MASTER WHERE TO BUY
Where ... in
Check the volume and squelch controls. They are very failure prone and can
go bad quickly. Check the position of the push button switches, it sounds
like the PL may be on. The volume and squelch controls push in and out,
when the squelch control is in, there is a trim pot on the back of the
Some of the older upright cabinets used a 2553 key. It has the same slot
arrangements but different pin configuration.
Jack
K6YC
- Original Message -
From: Maire Company [EMAIL PROTECTED]
To: Repeater-Builder@yahoogroups.com
Sent: Wednesday, March 30, 2005 5:50 PM
Subject: Re:
Vester,
A flatpack is another name for the mobile duplexers made by several
companies. They are generally painted black and are flat. Most are notch
type and some are helical resonators rather than actual cavities. They work
OK in a soft RF environment, not so good at a high level site.
These actually work pretty well if you throw the onboard duplexer away. It
may not work at all depending if your local band plan is high in or low in.
The little tension wires on the resonators are very important, don't try to
use it without one on every can. Mine runs 8 watts out of a flat
Would any of you have a surplus TLN6709B Vibrasponder on 123.0 that you
would like to sell or swap for one in 107.2?
Thanks
Jack
K6YC
Yahoo! Groups Links
* To visit your group on the web, go to:
http://groups.yahoo.com/group/Repeater-Builder/
* To unsubscribe from this group,
is more like 0.370.
Steve
WA6ZFT
On Wednesday 16 February 2005 07:50, Jack Davis wrote:
94830A550
Cadmium-Plated Stl Hex Thin Flex-Top Locknut 1/2-20
Screw Size, 3/4 Width, 21/64 Height
In stock at $10.91 per Pack
This item
Check McMaster-Carr, if they should have them. http://www.mcmaster.com/
This is the best place for hardware you will find anywhere!
K6YC
- Original Message -
From: [EMAIL PROTECTED]
To: Repeater-Builder@yahoogroups.com
Sent: Tuesday, February 15, 2005 12:59 PM
Subject:
The problem is not the line, trees grow out from the center and up from the
tip. If you hung an antenna at 90 feet in 20 years it would still be at 90
feet. The mount however would be covered in bark and wood. The tree would
continue to grow out and eventually cover the base and what ever
This looks like one of the old Bogner 8
bay UHF antennas, I would guess it weighs somewhere in the 750 to 1250 pound
range. I believe that Cablewave picked up the Bogner line and later merged
with RFS. With your picture you may be able to get a spec sheet from
them. You could try Bill
Any tower of 200 ft must be lit with either strobe lights or conventional
red lighting. There is also a formula for towers near the glide slope of an
airport that may require towers under 200 ft be lit. A tower with
conventional lighting must be painted with alternating bands of white and
The Secode tone was 2805 CPS and the mechanical decoder used a pin to latch
when a proper pulse count was received. A number of the RCC phone systems
used that for selective calling.
The MTS and later IMTS phones used the same type of mechanical decoder but
used alternating mark and space tones
I used a standard Amphenol T connector. Use a plier to unscrew the pin on
the male connector and the rod connecting the 2 female ports slides right
out. Cut one of the female slip on connectors right before the grooves end.
Put it back together and make sure the signal generator goes into the
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