Stuff to try:
1. Verify that the LO multiplier chain is peaked correctly. I've
seen a bunch of these that exhibit this symptom that had mistuned
LO chains.
2. Feed the test signal into the RX directly. If you see good
sensitivity, you know where to looks ;-)
3. Take
On 8/30/2010 2:08 PM, Chuck Kelsey wrote:
Doug, what were the State Police using for mobile radios back when you
were involved? I'm finding that the newer, wider front end, radios
don't hear as well as the old 0.5-1 MHz wide receivers did. I can hit
my 6-meter repeater full quieting,
- Original Message -
*From:* Oz-in-DFW mailto:li...@ozindfw.net
*To:* Repeater-Builder@yahoogroups.com
mailto:Repeater-Builder@yahoogroups.com
*Sent:* Monday, August 30, 2010 5:00 PM
*Subject:* Re: [Repeater-Builder] DB212-3
On 8/30/2010 2
No, the CH751 is different, but the MRCA was the same as the Kelvinator
refrigerator for years.
Bill Hudson wrote:
I didn’t know that RCA shared the CH751 key with the Cabinet key for
Motorola Outdoor cabinets.
This could be an error.
Bill Hudson
W6CBS
--
All of the compa racks I've seen used spring seel stampings from
Tinnerman. You might think they are crappy, but they are inherently
vibration resistant. What I think you might be thinking of are cage nuts:
Polyphasers have a shunt protection element. It usually fails and
becomes leaky so you get a loss/VSWR indication. It can fail open or
short. If it's open, there is nothing to detect.
On 8/17/2010 2:02 PM, Michael Ryan wrote:
Chuck, Thanks for that...wouldn't still pass RF if they are
Yup, huge variation by application. Some gas tubes, some MOVs, some
resonant stuff.
This stuff has a finite life. They have some pretty information on
their site:
http://www.protectiongroup.com/knowledgebase
On 8/17/2010 7:14 PM, WA3GIN wrote:
The units are probably different depending
Sorry, maybe. It's heavily application dependent. While senders
*tend* to be higher level lower loss devices, that difference diminished
over time. On some newer devices it seemed like the only difference was
the label. The very alst applicaitons before Motorola caved adn went
all electronic
I've seen this exact situation after a unit was moved. It's probably
even more likely when both parts are from the same vendor. I've seen it
with quick turn parts from ICM, too.
I don't know if it's caused by mechanical stress from aging, or the
addition of contaminant mass to the quartz
On 7/30/2010 10:15 AM, Kevin Custer wrote:
Tim wrote:
Hi Kevin,
Thanks for the info. I've used the PLL MastrII exciter on a couple of
systems also.
Now, since this duplexer is of the 'notch' variety, I already have about
100db of notch (on the TX side) that is tuned to the RX
On 7/29/2010 2:36 PM, Tim - WD6AWP wrote:
I emailed Spantek. They told me they don't do Micor's any more. CW
Wofle appears to not be in business as I can't find them on the web.
Any other ideas where I might find some UHF low split Micor parts?
If it's got to be Micor it's hamfest
On 7/28/2010 11:21 PM, ve7fet wrote:
Pulling it back apart isn't an issue with the 130C if you apply it
sticky side out. Once you slit down through the vinyl and 130c with a
knife, you can peel it apart to open up the splice.
Yeah, its a little work to get it to release from the jacket
And even the 88 split Mastr/MVP stuff works fine with minimal
modification at 420. Most of it just tunes, thouhg you need to add some
padding to get stuff the peak in a few cases.
On 7/27/2010 1:17 PM, Jeff DePolo wrote:
What is a good radio for building a one way 420 link? The
link will
--- In Repeater-Builder@yahoogroups.com
mailto:Repeater-Builder%40yahoogroups.com, jland138 jland...@...
wrote:
Any recommendations or best practices on weatherproofing the coax
connection to a base station antenna?
I use a layer of self vulcanizing silicone tape stretched and
On 7/25/2010 2:37 PM, Mike Morris wrote:
Photo here:
www.repeater-builder.com/wa6ilq/Motorola-S-1350-C-WATT-METER-with-500W-500-1000-MHZ.jpg
Anybody know who made the watt meter in the photo for Moto ?
I believe this was a Motorola fabricated item. It was also used with
several
On 7/23/2010 10:34 AM, tahrens301 wrote:
Hi folks,
Still working on the hardline duplexer for 6 meters, and have some
data I'd like to run by you guys.
Running 80 watts out of a Micor tx into the TX bank of cavities. With
test equipment, get about 100dB notch. (shows 50 watts into
On 7/13/2010 10:20 PM, tracomm wrote:
Didn't one of the large radio dealers recently get a hefty fine for
programming radios on frequencies that the user did not have a license
for ??
CJD
There are several examples of this. Not recent (15 os years ago?) a
shop renting radios to a
On 7/14/2010 6:37 AM, N1BUG wrote:
JG wrote:
Good fishing !!, or is your memory that good:)
I poked Ham Radio magazine into Google
and found a few articles on silver plating
in this list:
http://webhome.idirect.com/~griffith/hr/hrind05.htm
Safe, Sensible Silverplating ... that
On 7/14/2010 11:06 AM, dwmcg...@bellsouth.net wrote:
I read a few of the posts about silver plating and can tell there are
not many of the old build it your self 2/432 high power amp builders
left around. I was used to plate cavities and tank circuits.
The is a silver plating power that
http://www.hq.nasa.gov/alsj/quindar.html
On 7/13/2010 10:02 PM, ka9qjg wrote:
Meant a lot to the First Astronauts with Communications that is how
it got started I think , I forget if it was a Pre or after Transmission
Don
KA9QJG
--
mailto:o...@ozindfw.net
Oz
Silver plating can have an impressive positive performance effect under
some circumstances. It's also at advantage because it's corrosion
result is conductive, so performance is not effected by tarnishing.
--
mailto:o...@ozindfw.net
Oz
POB 93167
Southlake, TX 76092 (Near DFW Airport)
On 7/11/2010 11:46 AM, Oz-in-DFW wrote:
Silver plating can have an impressive positive performance effect under
some circumstances. It's also at advantage because it's corrosion
result is conductive, so performance is not effected by tarnishing.
--
mailto:o...@ozindfw.net mailto:oz
FTAGH = Free To A Good Home
Pickup in DFW or ship in Small USPS Flatrate box for $5 to US, or for
fixed rate by destination internationally.
http://www.usps.com/prices/priority-mail-prices.htm
or internationally:
http://ircalc.usps.gov/
--
mailto:li...@ozindfw.netOz
POB 93167 Southlake,
It's yours. Drop me a note off list.
On 7/6/2010 6:40 AM, Stan wrote:
I will take it if you still have it.
Stan
*From:* Oz-in-DFW mailto:li...@ozindfw.net
*Sent:* Tuesday, July 06, 2010 7:34 AM
*To:* Repeater-Builder@yahoogroups.com
mailto:Repeater-Builder@yahoogroups.com
Or:
http://www.wa5vjb.com/products4.html
6.5 by 4.25 Large Proto Board $5
3.75 by 2.75 Small Proto Board $3
Kent is also a source of economical built-to-spec preamps.
--
mailto:o...@ozindfw.net
Oz
POB 93167
Southlake, TX 76092 (Near DFW Airport)
On 7/4/2010 11:25 AM, terry_wx3m wrote:
DSTAR is totally foreign to me. I can't think of anyone in the
immediate area that even has a DSTAR capable radio.
We are experiencing some interference on the input to one of our club
repeaters. What baffles me is that the repeater is in PL
On 7/3/2010 7:13 AM, Brian wrote:
You must remember, that the average IQ is 100. Of course that means
that half the population of the world has an IQ below 100. Think
about that when you are on the freeway or voting!:-)
You've also got to remember that many corporations require
On 6/25/2010 1:44 PM, skipp025 wrote:
Kevin. ZL1KFM spar...@... wrote:
Plan was to build 3 remote RX sites and feed it back to
the main site (4th RX) and expand the coverage.
However our MED (Your FCC) decided to charge for every
repeater in the country, this included Amateur
68P81061E50-A Covers 132-174 RF and options for A rev GRB and GSB models.
Pick up in DFW or pay postage.
--
mailto:o...@ozindfw.net
Oz
POB 93167
Southlake, TX 76092 (Near DFW Airport)
I have a number of M57729L which are 400-420. The H is 450-470. These
hybrid parts lose gain pretty rapidly outside the spec'd range but will
make power over quite a wide range. The L will make spec up to 430 or so
an have full power capability at reduced gain to almost 440. Probably
not an
Dave,
You're probably right that the new location probably makes up for a lot.
Have you been able to confirm that the antenna still works up at it's
rated freqs?
How much feedline loss are you dealing with? Most 'good' sites have
significant feed line runs and therefore loss. While I
On 4/29/2010 8:34 AM, wd8chl wrote:
I don't recommend them for repeater use though. The transmitter won't
handle continuous duty at full power even with a fan, and it's iffy at
lower power. The rx is good, but it has a somewhat broad front end.
Not to mention the capabilities of that
Yes, but odds are good you are dealing with three different problems -
similar mechanisms but different participants. Unless of course you can
hear it at all three sites on the same frequency.
On 4/24/2010 1:48 PM, Mike Besemer (WM4B) wrote:
Given that the interference is in three
Mike,
I'm coming to this late, but I have comments and questions.
What type of hardware are the paging transmitters? What are the
repeaters in question, and what type of duplexers, feedline, and
antennas are used?
On 4/24/2010 3:42 PM, Mike Besemer (WM4B) wrote:
Not sure what you mean by
I've got quite a few MHW720A2 on hand. These are in a very similar if
not identical package. They are 20W 440-470 Mhz parts. Data sheet is:
http://www.n5ebw.com/downloads/MHW720A2.pdf
On 4/19/2010 3:23 PM, Tom Parker wrote:
Sorry, I guess I should have been clearer. It's no longer
How much current is it pulling? At 53.7 I suspect you are well into the
roll off on the output low pass filter. I forget exactly how it's
implemented in this case.
On 3/18/2010 9:06 AM, tahrens301 wrote:
Hi all,
Working on a micor mobile to be used as a
repeater (only using the
On 3/8/2010 2:33 PM, Kevin Custer wrote:
Steve wrote:
It seems logical that if a rptr tx is running 200w, and the mobile
is running say 50w then it is going to be one way ie mobile hears rptr
but rptr don't hear mobile too well
Common misconception.
Lets say the mobile radio has a
On 2/27/2010 4:53 PM, Joe wrote:
Oz, in DFW wrote:
Make sure you use twisted pair. Station wire like that use to wire
houses is often not twisted. Ethernet cable is good and has a high
twist pitch - better for this application.
I wonder if CAT 6 would be better than CAT5 due
I vigorously second Jeff's recommendation. This is an application where
iron is still the right answer.
Make sure you use twisted pair. Station wire like that use to wire
houses is often not twisted. Ethernet cable is good and has a high twist
pitch - better for this application.
Repeat coils
GE MVPs are the best answer I've found hands down. Swap a VHF RX in a
UHF frame. You can use a MastrII or ExecII for the TX site and it's all
very neat.
Even cooler - MastrII RX and TX's convert to 220 pretty easily. While
the conversion is not for the faint of heart, 220 links are cool.
On
From the information you've provided I'm look hard at a Motorola R1225
or a pair of GM300s.
The diamond will certialy lower your SWR, but so will a 50 ohm dummy
load. Low SWR isn't the only concern any more than antenna gain is.
It's likely the Diamond will work, but these ham market antennas
I have a 30 dB 250 W pad that I use with radios that put out over 50
Watts. My HP8921 will handle that without problem. It'd work with the
2.5W case. I don't remove it for sensitivity checks as I can compensate
for it in the 8921. Most service monitors modern enough to have been
designed for
.
They are out there.
On 1/2/2010 2:18 AM, K5IN wrote:
Good evening,
Your e-mail brings up one question: used duplexers for 220 where?
Brian
- Original Message -
*From:* Oz-in-DFW mailto:li...@ozindfw.net
*To:* Repeater-Builder@yahoogroups.com
mailto:Repeater
Micor conversions work very well, but are rather involved.
MVP/Exec/Mastr II conversions are much easier and work as well. The MVP
package works out really well.
Both the Motorola and GE radios rely on a different PA. Most use a
hybrid brick to get power. I have several of these I've been
I finally got everything dug out. I have 10 sets to spare.
What I have are sealed Motorola RPX-4460A kits that include a single
Signetics 82S129N which is Motorola Part Number 51-83625M26
Paypal with shipping address to the reply email address on this note, or
certified funds after an email
Taken
Oz-in-DFW wrote:
Oh, and the RX shelf is a just a PURC link RX shelf, band and
condition unknown. I believe it's actually a MICOR RF deck
Oz-in-DFW wrote:
FTAGH = Free to a Good Home
This is a project I'll never get to. Pickup in Southlake, or I can
strap it to a pallet
I have a box of the correct parts in Motorola packages I'll sell for $8
each including postage to the US.
Kris Kirby wrote:
I have a VHF Syntor and a few UHF MCX100s. I'm looking into purchasing
PROMs to program them with. The UHF MCXs had the knob-stop removed and
it now turns to all 16
into the option lines and see if I can switch (or lock) modes
without using the control head. This would give me a little peace of
mind that I won't burn things out. Reprogramming just mode 1 would fix
it, but I'm trying not to have to do that.
73, Joe, K1ike
Oz, in DFW wrote:
I believe that you can also
The power control pots on these are notorious for going flakey.
Chuck Kelsey wrote:
In addition to checking the solder joints on the transistors, check the
connection between the PA output and the harmonic filter. This is another
prone intermittent point.
Chuck
WB2EDV
- Original
One fellow down the reply list sent you the Belden marine pamphlet, give
that man a prize.
The short answer is the biggest **flexible** cable you can manage. But
there are other considerations just as important;
1) Supporting the weight of cable. Clamp it at the top and bottom.
Don't expect
I believe that you can also program accessory connector option lines as
channel select inputs. This will let you select channels without a
control head.
Eric Lemmon wrote:
Joe,
The control head is needed only to change modes in local control,
listen to
the incoming audio, and for
Only on UHF. VHF was a lowpass filter.
Kris Kirby wrote:
On Mon, 2 Nov 2009, dep...@starband.net mailto:depley%40starband.net
wrote:
I believe you are right. Simplex is difficult with a circulater.
Can you receive through a circulator without heavy losses? I've never
tried it...
I have several Mitsubishi 220 PA Hybrid Modules. 100 mW in, 20~25 W
out. $30 each. I have a friend that made some interface PCBs, not
essential, but handy. I'll ask him what he wants for them if anyone is
interested.
Eric Lowell wrote:
I did a Micor mobile once (VHF-Hi to 220) It was a lot
They might tune done. If not, try brass screws. I've used this to move
high splits to 2 meters.
tahrens301 wrote:
Hi Folks,
I picked up a bunch of Micor repeaters today,
and as I figured, they have the TLD xxx4
receiver in them. (160-174mhz).
I know that to put on 2 meters, new
The Academy of Model Aeronautics went through a standards change a
while ago. AM radios are no longer certified for exactly this reason.
If he's using radios that don't meet modern performance standards he is
invalidating both the airfield and his insurance.
I'd like to know how he determined
No, that price is for a complete replacement - TX, RX and servos.
Unless his system uses mechanical reeds and germanium transistors all he
will need is an RX per plane (~$65) and a new TX, so buy a $200 Kit and
four RX's $500 tomorrow, $350 if you shop.
m...@nb.net wrote:
So he is looking
Your assertions are true as far as they go, but AMA insurance is then
invalid, and most other insurers follow their lead. The AMA standards
are the litmus test for insurabilty and represent 'good practice'
If the guy is rolling his own, he would understand enough to avoid this
problem entirely.
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