[Repeater-Builder] MOTAROLA - M2170

2010-08-27 Thread ac6vj


Hi Gang,

I am looking for a Motorola M2170 8 pin DIP IC or a cross reference for it. It 
is used in a Mitrek transmit power control circuit.

Gregory AC6VJ



[Repeater-Builder] Re: MOTAROLA - M2170

2010-08-27 Thread ac6vj


Thank you Richard,

The LM 741 brought the MITREK back to life again, the power control circuit 
uses the op amp as a simple voltage comparator. What was confusing me was the 
radio has pin 8 of the op amp grounded
and the datasheet for LM 741 show pin 8 not connected internally.


Gregory AC6VJ


--- In Repeater-Builder@yahoogroups.com, Richard richardarnol...@... wrote:

 The 5184621K70 cross references to 5184320A13. As a generic, its an LM-741 
 op-amp.
 
 --- In Repeater-Builder@yahoogroups.com, ac6vj ac6vj@ wrote:
 
  
  
  Hi Gang,
  
  I am looking for a Motorola M2170 8 pin DIP IC or a cross reference for it. 
  It is used in a Mitrek transmit power control circuit.
  
  Gregory AC6VJ
 





[Repeater-Builder] Re: Out Door Radio Cabinet

2010-06-28 Thread ac6vj

Hi Larry,

I have a stash of traffic signal boxes here in Northern California.
I donate them free of charge to any good Ham cause.

AC6VJ  {ac...@cds1.net}


--- In Repeater-Builder@yahoogroups.com, Larry Watkinson lwatkin...@... 
wrote:

 I am looking for a outdoor radio cabinet, something like a traffic control
 box.
 
 I am in Olympia and would be able to go within 100 miles of Olympia, WA. I
 could pay shipping to Olympia if outside of 100 miles.
 
 Larry KC7CKO





[Repeater-Builder] Re: Out Door Radio Cabinet

2010-06-28 Thread ac6vj

The cabinets come with the card cages, but alas, no cards.
I wish they did come complete so I would have one to play with myself.

Gregory AC6VJ



--- In Repeater-Builder@yahoogroups.com, Maire-Radios maire-rad...@... 
wrote:

 have any traffic controllers?
 
 
   - Original Message - 
   From: ac6vj 
   To: Repeater-Builder@yahoogroups.com 
   Sent: Monday, June 28, 2010 12:41 PM
   Subject: [Repeater-Builder] Re: Out Door Radio Cabinet
 
 
 
 
   Hi Larry,
 
   I have a stash of traffic signal boxes here in Northern California.
   I donate them free of charge to any good Ham cause.
 
   AC6VJ {ac...@...}
 
   --- In Repeater-Builder@yahoogroups.com, Larry Watkinson lwatkinson@ 
 wrote:
   
I am looking for a outdoor radio cabinet, something like a traffic control
box.

I am in Olympia and would be able to go within 100 miles of Olympia, WA. I
could pay shipping to Olympia if outside of 100 miles.

Larry KC7CKO
   





[Repeater-Builder] Re: 3' motorola or GE cabinet wanted.

2010-04-26 Thread ac6vj
Paul,

I have some aluminum traffic signal boxes that are 5 1/2 feet tall  20 inches 
wide and 3 1/2 feet deep.  Here in Northern California that are just perfect 
for outdoor repeater cabinets.

Gregory AC6VJ

--- In Repeater-Builder@yahoogroups.com, Paul Plack pl...@... wrote:

 Larry, are any of your cabinets outdoor types? I'm in Salt Lake City, but 
 have relatives near you who could pick up  store, and might be interested. - 
 Paul, AE4KR
 
 - Original Message - 
   From: larryjspamme...@... 
   To: Repeater-Builder@yahoogroups.com 
   Sent: Monday, April 26, 2010 1:43 PM
   Subject: Re: [Repeater-Builder] 3' motorola or GE cabinet wanted.
 
   Too bad you're so far away (I'm in Portland, OR).  I'm just getting ready 
 to list some on the local craigslist - my garage is overflowing and some cars 
 need the space. I have some of the deep Quantar/MICOR type cabinets - the 
 short ones, medium height, and 5-foot tall ones. And one - 40 tall GE MASTR 
 II Cabinet.  All of the Motorola cabinets are the deep ones that would hold 
 repeaters with duplexers, etc. IF they don't sell locally, they're off to the 
 metal scrapper.
 
   Larry





[Repeater-Builder] Re: Duplexer parts

2010-04-15 Thread ac6vj


Gary,

Try Viking Technologies LTD. at www.cardwellcondenser.com
they have a very large selection of Johnson, series 167 capacitors and will be 
able to give you the exact specifications on the broken one that you have.

Gregory AC6VJ


--- In Repeater-Builder@yahoogroups.com, Gary Hoff k7ney...@... wrote:

 I already found that one, thanks anyway, the 167-205 is close but not enough
 plates, mine has 6 rotor and 6 stator.  Physical size is right though, 
 maybe this
 cap was made by Johnson also since the numbers are close.
 Gary
 
 On 4/15/2010 1:59 PM, DCFluX wrote:
 
  http://www.surplussales.com/Variables/ButterflyCapacitors/ButCap1.html 
  http://www.surplussales.com/Variables/ButterflyCapacitors/ButCap1.html
 
  (CAV) 167-205-71 sounds close to it.
 
  On Thu, Apr 15, 2010 at 11:59 AM, Gary Hoff k7ney...@... 
  mailto:k7ney123%40q.com wrote:
   I have an old Phelps Dodge VHF Duplexer that has a
   frozen air variable.  The Duplexer is a part# 499-509 and
   covers 144-174.  The air variable in question is stamped
   167-202 and is split stator about 1 3/8 square.  Anybody
   know where I might find a suitable replacement, I haven't
   had any luck where I've been looking.
   Gary K7NEY
  
  
   
  
  
  
   Yahoo! Groups Links
  
  
  
  
 
 





[Repeater-Builder] Re: Radio conversion to 225MHZ

2009-10-15 Thread ac6vj
J and the Group,

I have a converted MICOR mobile one 220 with a Toshiba amplifier module in it 
set to 15 W out driving a TE Systems 2206RN amplifier with 65 W out.  In Skipps 
vault on Mt. Vaca and it has been working flawlessly since its installation, 
four years ago.  The TE Systems, amplifier was not cheap, but when you take 
into account that I have not had to go up to the top of the amount in four 
years to work on it, it's a great deal.

Gregory AC6VJ

--- In Repeater-Builder@yahoogroups.com, K5IN k...@... wrote:

 Kevin,
 
 
 Any suggestions for a decent quality 220mhz amp for repeater duty?
 
 Micor 20-25 watts drive or pull the PA and exciter in and 50-60 watts
 output?
 
 
 Thanks
 
 -Original Message-
 From: Repeater-Builder@yahoogroups.com
 [mailto:repeater-buil...@yahoogroups.com] On Behalf Of Kevin Custer
 Sent: Wednesday, October 14, 2009 5:57 PM
 To: Repeater-Builder@yahoogroups.com
 Subject: Re: [Repeater-Builder] Radio conversion to 225MHZ
 
   
 
 J wrote:
  Has anyone converted any of the commercial (GE/Motorola) radios to the 220
 band? If so what works and what doesnt. I need several 225 radios and
 thought this might be a route to go.
 
 I have converted MASTR II Mobiles, both multiplier and PLL exciter, with 
 standard receivers to 220 MHz. - they work fine, the PLL is easier. 
 There are preferred instructions on the MASTR II conversion site: 
 http://www.repeater-builder.com/rbtip/geindex.html#220
 http://www.repeater-builder.com/rbtip/geindex.html#220 
 
 For the M2 with a PLL exciter, Scott sells a complete conversion kit:
 http://www.repeater-builder.com/products/MIIconversionkit.html
 http://www.repeater-builder.com/products/MIIconversionkit.html 
 
 The PA's won't convert, but there is an easy fix:
 http://www.repeater-builder.com/products/ampbd.html
 http://www.repeater-builder.com/products/ampbd.html 
 
 I have converted MICOR Mobiles and Stations to 220 MHz. - they also work 
 fine. There are preferred instructions on the MICOR conversion site:
 http://www.repeater-builder.com/rbtip/micor-index.html#220
 http://www.repeater-builder.com/rbtip/micor-index.html#220 
 Helical Resonators modified for 220 operation are available here:
 http://www.repeater-builder.com/products/
 http://www.repeater-builder.com/products/ 
 
 The PA's won't convert, but again - never fear, the amp board is the 
 solution:
 http://www.repeater-builder.com/products/ampbd.html
 http://www.repeater-builder.com/products/ampbd.html 
 
 Any of the above radios can be converted to 220 MHz and achieve book 
 specification sensitivity on the new band. My favorite is the MICOR.
 
 Hope this helps...
 Kevin Custer





[Repeater-Builder] Re: More on the Q2330 Duplexer

2009-03-27 Thread ac6vj
Hi Gang,

I have two 2M repeaters made out of Micor Mobil's running 30W each.  They both 
use Sinclair Q202G0-N Hybrid Ring [the model number you're looking for] with 
absolutely no desense.  They are the bomb, but thay are a little bit of work to 
tune, the only problem with using the Q202G is that the plunger hits the bottom 
of the can at about 144.700 megahertz.





- In Repeater-Builder@yahoogroups.com, n3dab rb_n3...@... wrote:

 The Q202 with the 7 dia cans would give you better results, i believe, 
 higher Q and all that.  The hybrib ring type might be a PIA to retune but if 
 you have the 4 cans with the Tuning Capacitor in the Loop Assembly tuning 
 will be much easier and you should get 85 to 90 dB isolation per side.  Not  
 sure what the complete model no. is but there are some on eBay in one of the 
 store listings (though the price is quite high for the Ham market).
 
 Doug  N3DAB
 --- In Repeater-Builder@yahoogroups.com, David Struebel wb2ftx@ wrote:
 
  With all of this discussion, is either the Q202 or its cousins or the new 
  Q2330 all with now 80 dB of isolation good enough for a 2 meter repeater 
  with a 0.6 MHz split?   Putting a new machine on the air and need to know 
  if I should go with a 6 cavity duplexer to give me the 100 or so dB 
  isolation, and albeit the higher insertion loss or can I stay with a 4 can 
  duplexer with typically 85 dB isolation and 1.5 dB insertion loss?
  
  In a quandry... most of my experience is with a Sinclair hybrid ring 
  duplexer which seems to work fine at a 25 watt level.
  
  
  73 Dave WB2FTX
- Original Message - 
From: John J. Riddell 
To: Repeater-Builder@yahoogroups.com 
Sent: Wednesday, March 25, 2009 7:41 PM
Subject: [Repeater-Builder] More on the Q2330 Duplexer
  
  
  
After checking the Sinclair Web site, I see that they have lowered the Tx 
  - Rx isolation
on the Q 2330 duplexer to 85 Db.
The original literature that I had claimed 100 Db.
  
73 John VE3AMZ
  

  
  
  --
  
  
  
No virus found in this incoming message.
Checked by AVG - www.avg.com 
Version: 8.0.238 / Virus Database: 270.11.29/2023 - Release Date: 
  03/25/09 18:54:00
  
  
  
  No virus found in this outgoing message.
  Checked by AVG - www.avg.com
  Version: 8.0.238 / Virus Database: 270.11.30/2026 - Release Date: 03/27/09 
  07:13:00
 





[Repeater-Builder] Re: Micor newbie needs advice

2009-02-21 Thread ac6vj
Hi Mike,

By the number of Micor's that you are talking about, I take them to 
be converted mobil's not Compa Stations.  I have run into this 
trouble before on Micor mobil's, what I found to be the trouble is 
the interconnect board uses rivets instead of plated through holes 
and the solder joint at these rivets go bad.  I inject a signal into 
the receiver's front-end, and then use an oscilloscope and probe 
along the traces on the interconnect board until I find the offending 
solder joint.

Gregory AC6VJ




--- In Repeater-Builder@yahoogroups.com, Mike Besemer \(WM4B\) 
mwbese...@... wrote:

 Greetings all,
 
 I normally maintain a couple of 'out-of-the-box' (Kendecom) 
repeaters, but
 recently I've been asked to help out with another system that is 
homebrewed
 from Micors.  It consists of 4 Micors (TX on 2 meters, RX on 2 
meters, TX on
 440 and RX on 440) linked with a CAT-500 and a set of homebrew 
controls.  
 
 Lately, the 2 meter RX has become intermittent.  For a while, I'd 
been able
 to either wiggle the plug on the front of the receiver or give the 
receiver
 a good whack and it'd come back to life, but lately it's become 
more and
 more obstinate.  A couple of weeks ago, I brought the RX back to my 
shop and
 pulled all the boards, cleaned the pins and did my best to look for 
obvious
 problems.  I really didn't see anything wrong, but when I 
reinstalled the
 RX, it work fine and I thought (after it ran for a couple of weeks) 
I must
 have fixed it.  (I have no way of running it on the bench... so it 
was just
 a plug-and-pray fix.)  
 
 Unfortunately, it crapped out again a couple of days ago, and this 
time
 reseating the plug and banging had no effect.  One thing I did 
notice that
 I'd not seen before (it's hard to access the rear of the repeater) 
is that
 the plug (on the harness) is missing a piece of plastic surrounding 
the
 three pins nearest the hinged side of the handle.  I haven't had 
time to
 pull up the drawings yet to see what those pins are, but I suspect 
that may
 be at the heart of my problem.  
 
 At any rate, I'd like to be able to run this beast on my bench.  
Where can I
 come up with a harness and control, and what (if any) additional 
hardware
 would I need to be able to get this thing hooked up?  
 
 Second, IF the harness plug IS the problem, what's the best course 
of
 action?  Changing the plug looks like a real bugger.  I haven't 
traced it up
 to the homebrew controls yet, so I'm not sure how difficult it'd be 
to swap
 out the entire harness (if I had one), but either way doesn't look 
like much
 fun.
 
 73,
 
 Mike
 WM4B





[Repeater-Builder] Re: OT maybe info wanted on 220 crystal rigs

2008-07-29 Thread ac6vj

Hi Ray:

I have a pair of Midland, 13-509 radios which are the same as Clegg 
FM-76, I use for link radios.  They are great radios, even though 
they're getting a little old, they are easy to work on, and many 220 
repeaters have been made out of these radios.  The two main drawbacks 
for using a Clegg FM-76 radio, is a pair of TX/RX crystals cost $30-
$40 for each frequency pair, and the radio did not originally come 
with a TX PL board.  So it does not take very long to have more 
invested in crystals and a PL board than a new synthesized radio 
costs.

Gregory AC6VJ

--- In Repeater-Builder@yahoogroups.com, Ray [EMAIL PROTECTED] wrote:

 Anyone on the list know if its a good idea to purchase a good used 
 crystal controlled rig for use on 220 ?
 
 I'm wanting to get on that band,without a huge radio investment.
 I saw Clegg FM-76 listed for sale,as an example.
 
 respond thru the list or direct.
 
 n3pyj at windstream.net
 
 
 Ray





[Repeater-Builder] Re: UHF MICOR Unified Chassis

2008-07-27 Thread ac6vj
Hi Mark:

Pull the exciter board out and measure the resistance between pins 
one and five on the transmitter interconnect board.  There should be 
infinite resistance between the two pins.  If there is continuity 
between pins one and five on the transmitter interconnect board, cut 
the trace on the exciter board leading to pin five P902, see note 409 
on the Exciter/1ST Bandpass Filter schematic pullout in the Micor 
Base and Repeater Station Manual 68P81025E60.

Gregory AC6VJ



--- In Repeater-Builder@yahoogroups.com, n9wys [EMAIL PROTECTED] wrote:

 OK gang, I'm working on another project and have run into a wall.
 
 I have a UHF MICOR Unified chassis station that I am reassembling 
with the
 thought of putting it on GMRS once finished.  Yes, this station was 
TOTALLY
 disassembled and scattered to the four winds - chassis, PA and some 
cards
 came from one place, more cards from another, yet more cards from 
yet
 another place, power supply and cabinet from yet another...  I have 
the
 station reassembled to the point where it is operating in that it 
repeats
 (keys up on receipt of signal and PL) but it does not pass audio.  
And yes,
 I am resurrecting it on the freqs it was originally tuned before I 
make any
 changes.  Right now it's on 462./467. and has one 4-User 
Control
 Module (PL decode) card in the chassis.  No PL on TX yet...  The 
station has
 the following cards in the chassis (listed from right to left):
 
 Line Driver
 Station Control Module
 Squelch Gate
 Time Out Timer
 Master Decoder
 4-User Control Module Card
 
 Am I missing any other cards?
 
 I know these stations have jumpers all over the place - backplane, 
cards,
 etc. - that all needed to be configured properly for the thing to 
work the
 way it should.  I have the manuals, but I am stumped.  I know I'm 
missing
 something, SOMEWHERE - my problem is: WHAT and WHERE?  
 
 Besides, the manual's diagram for the backplane shows jumpers 
numbered in a
 certain sequence and the backplane I have has them numbered 
differently -
 they're in the same locations, but numbered differently. (For 
example JU1
 and JU3 are opposite when the manual is compared to the one I have 
in the
 shack.)  I've also gone to the Repeater-Builder web site, but those 
pages
 seem to refer more to the conversion of the station or cards rather 
than
 making it work as designed. Maybe once I get it going, then I can 
think
 about conversion of the cards that Kevin referenced...
 
 Anyway - as far as the backplane goes, I think all jumpers except 
for JU5
 should be OUT.  Am I correct?  (I currently do not plan on any 
remote
 control of the station, but later down the road maybe tone remote
 operation...)  And what about the Line Driver, Squelch Gate and/or 
Station
 Control Module cards jumpers?
 
 Any ideas? (Kevin, you're the MICOR guru...)
 
 Thanks,
 Mark - N9WYS





[Repeater-Builder] Re: antenna mounting hardware

2008-07-13 Thread ac6vj
Ron:

I have had great luck using U-Bolt-It,Inc. 
Http://www.uboltit.com/index.html out of Houston, Texas.  They have a 
extensive inventory of large size hot dipped galvanized U-Bolts, I 
have also had them make me Slant U-Bolts and Hook Bolts to mount 
antennas, on angle iron cross braces.  You did not mention how high 
up the tower you were going to mount your station master antenna, but 
no matter its height.  You do not want to go up there very often, and 
using bent all-thread is a train wreck waiting to happen, due to the 
stress set up in the root of the thread on the stretch side when you 
bend the all-thread.  All-thread has many good uses, but none of them 
are on a tower.

Gregory AC6VJ

--- In Repeater-Builder@yahoogroups.com, Ron Wright [EMAIL PROTECTED] 
wrote:

 Hi all,
 
 I am about to put up a Telewave Super Station Master up over 1000 
ft above ground on a large tower.
 
 The legs at that level are 5.25 and am in need of hardware for 
securing the top and bottom mounts to the legs.  I have all except 
the leg mounting hardware.
 
 I've looked at Tessco and know they can be expensive, but will pay 
for it for this install if I have to.  Does anyone know of a source 
or V-clamps or the like for 5.25 legs???
 
 This has to be hardware that will last 20 years and not hose clamps 
which I have.
 
 73, ron, n9ee/r
 
 
 
 Ron Wright, N9EE
 727-376-6575
 MICRO COMPUTER CONCEPTS
 Owner 146.64 repeater Tampa Bay, FL
 No tone, all are welcome.





[Repeater-Builder] Re: 220 MHz. Amplifier?

2008-02-01 Thread ac6vj
Robin,

I bought a TE Systems 220 repeater duty amplifier 18 months ago, and 
it has been working flawlessly since I received it.  It is made out 
of the highest quality parts, to commercial standards, with a large 
heatsink.  I looked at its output with a spectrum analyzer, and it is 
extremely clean.  The only negative comment I can make about the 
amplifier is they lost it in their own warehouse for over three 
months after I had ordered.

Gregory AC6VJ

--- In Repeater-Builder@yahoogroups.com, Robin Midgett [EMAIL PROTECTED] 
wrote:

 I have a friend who's looking for a 80 or so watt amplifier for his 
 224.84 MHz. repeater. Is there a recommended product for this 
 application these days? Mods or kit building are welcomed, as are 
 leads on plug-n-play solutions.
 
 Thank you,
 Robin Midgett K4IDC
 VHF+ Glutton EM66se
 6, 2, 222, 432, working on the rest!





[Repeater-Builder] Re: HELP - 3x Mitreks will Not Tune up for Repeater RX on 10mtrs.

2008-01-23 Thread ac6vj
Hello Kevin,

It sounds to me like the Extender noise blanker is cutting back on 
your I.F. gain; it is probably set to your new L.O. frequency.  In 
repeater service, you do not want to use the Extender.  So make sure 
that jumper 301 is across the primary of T300 and jumpers 3A, 3B, and 
3C are not installed on the interconnect board.  The way to test to 
make sure that the extender is not cutting back your I.F. gain is to 
measure the voltage on the plus terminal of the C324.  If it is 
around 6V the Extender is not cutting back the I.F. gain, but if it 
is around 4V the extender is cutting back the I.F. gain.

A word of warning: the heatsink on the Mitrek is woefully undersized 
for 100% duty cycle and needs lots of forced air flowing over it.  
There is a lot of good information on Repeater Builders about cooling 
a Mitrek.

Gregory AC6VJ



--- In Repeater-Builder@yahoogroups.com, Gmail - Home [EMAIL PROTECTED] 
wrote:

 Hi All,
 
 I am now in need a some big HELP.
 
 I have been trying to get our groups 10mtr  repeater up and 
running, and it 
 seems to want to block me at each point.
 I am very grateful for the help that has been given so far, and 
this has got 
 us to the point where we have 50% of the repeater running.
 But as I said above, it appears that I have hit a block again.
 I can not get the RX to tune anywhere down to the specs the radio 
says of 
 .3uV. The best I can do is 1.9uV. And this is the same for all 3 
radios I 
 have.
 
 The radio were originally fitted with 33Mhz ICOMS, and I have now 
fitted 
 them with 29.540 ICOMS. They are tuning up, but not as good as I 
would 
 expect.
 Our work radio techinian is even baffled as to the problem, and he 
has 3 
 decades+ experiance.
 
 Checking the schmatic I notice there is no pre-amp on the RF input. 
I could 
 add a pre-amp here, and this would help. But before I go this route 
I am 
 asking if there is anything else I can do to get it (them) working 
better.
 
 FYI, I am using our companies radio workshop which has all the 
required 
 tuning and testing equipment for the aligniment. Be it not the 
Motorola 
 gear, but it does the job.
 
 I can't remember the model numbers, radios are still at work, but 
they 
 correspond to 60w, single channel, with extender fitted.
 
 My understanding from others within this group, these radios will 
tune down 
 to 29.540 without any trouble.
 So, am I doing something wrong? (Not famillar with Mitreks here in 
NZ, never 
 made it this far downunder).
 Are all 3 radios faulty? I can't see why, but maybe.
 
 Are there mods that are required that I have overlooked in all the 
 information I have onhand, from the many web-pages?
 
 Do I need to go to another type of radio? And if so, which one/s? 
Then does 
 anyone have one available? Or come to that, does someone have a 
tuned Mitrek 
 they can spare to sell (or donate).
 
 I will also post this on the repeater-builders user group just in 
case they 
 can help also.
 
 Thanks for any input, and if you wish to contact me directly, 
please e-mail 
 me at [EMAIL PROTECTED] Please remove the - in the gmail account, I try 
 and limit the spam I get.
 
 With the increase of 10mtr activity down here, have a listen 
for ZL1HK on 
 29.64Mhz
 
 Regards
 
 Kevin, ZL1KFM.





[Repeater-Builder] Re: Mot? Lo-Band duplexers

2008-01-09 Thread ac6vj
Hi Scott,

This is a DB4032 duplexer, and there is plenty of information on the 
Repeater Builders web page about moving these up to 6M.  I have one 
on my 6M repeater, and it works great.  Though 2dB of insertion loss 
is a bit high.  But what you lose in insertion loss you gain in size 
compared to a full-size 6M duplexer that looks like it's made out of 
chunks of a telephone pole.  It uses many UHF connectors in its 
construction, and I have found that if they are not extremely tight  
it will make the duplexer microphonic.

Gregory AC6VJ




--- In Repeater-Builder@yahoogroups.com, Scott Zimmerman 
[EMAIL PROTECTED] wrote:

 Anyone seen a set of these before? Any documentation available? Can 
they be used on 6M?
 
 I have never seen this type of duplexer They are marked with 37.98 
as a frequency. The open port on the tees kinda makes me wonder. 
 
 These are not mine. I can't lay hands on them personally. I am 
posting this for a friend, and out of general curiosity.
 
 Scott
 .
 Scott Zimmerman
 Amateur Radio Call N3XCC
 612 Barnett Rd
 Boswell, PA 15531





[Repeater-Builder] Re: 10 meter split site

2008-01-05 Thread ac6vj
Hi Steve,

I have 2 1/2 mile distance between my receiver and transmitter on my 
10 meter repeater, and have no desense on the receiver.  One of the 
important things is that the receiver has a high dynamic range. I am 
using a Micor receiver because of its ability to reject nearby 
signals.  100W is kind of high power for a local 10 meter repeater. 
From your location 40 to 50W is plenty of power, at that elevation 
and should give you coverage from Redding to Fresno, and the lower 
power level will help on your receiver defense. Don't forget that 
your users will probably be using Radio Shack mobile radios that on a 
good day can barely make 25W, and there antenna is not as good as 
your repeater antenna.  After all, you do not want to end up with an 
alligator, but with a balance system that matches your users ability.

Gregory AC6VJ


--- In Repeater-Builder@yahoogroups.com, Steve Allred [EMAIL PROTECTED] 
wrote:

 I am in the process of building a 10 meter repeater and was 
wondering if I could get some help form you guys. 
   What is the best distance separating Tx from Rx on a split site 
repeater without creating a big disparity between talk in vs talk 
out, yet still provide the needed isolation? I have tried to 
interpolate the DB horizontal isolation charts but with only minor 
success. I also have modified DB pass cans to cover 29 MHz, so I have 
some pass protection on the receiver and transmitter. Output will be 
in the 100 watt range to an lowband DB201.

   Any thoughts?

   Thanks!
   Steve / K6SCA
 

 -
 Never miss a thing.   Make Yahoo your homepage.





[Repeater-Builder] Re: Motorola Micor Unified Chassis

2007-11-01 Thread ac6vj
  Hi Don,
 

The quick answer is no yes no.  The long answer is,  
On the low band Compa-Station the output power control Board samples 
the VSWR on the output and folds back, the gain of the pre-driver in 
the power amplifier when the VSWR gets too high compared to the current 
draw of the final transistors.
On a low bay and mobile.  The antenna matching board is used to adjust 
the VSWR on the output and there is a directional coupler that you can 
attach a test set meter to.  But there is no feedback to the power 
amplifier.  The power amplifier has a thermocouple which is located on 
the heatsink, that is connected to a relay that shorts out a winding in 
the coupling transformer between the driver and a final transistors.  
Thus reducing the drive to the final transistors when the heatsink gets 
too hot.

The VHF Compa-Station and mobile radios use the same circuitry.  Which 
is a directional coupler on a power control Board that samples VSWR on 
the output port and folds back the gain of the pre-driver in the power 
amplifier when the VSWR compared to the current draw of the final 
transistors gets to high.

UHF Compa station and mobile radios use the same system, but wired a 
little differently.  They sample the return of loss on the isolation 
port of the circulator and compare it to the current draw of the final 
transistors of power amplifier.  If the return loss on the isolation 
port of the circulator gets too high compared to the current draw of 
the finals.  The power control Board, folds back the gain on the 
predriver of the power amplifier chain.

Gregory AC6VJ



--- In Repeater-Builder@yahoogroups.com, Don [EMAIL PROTECTED] wrote:

 On the Motorola Micor Unified Chassis type repeater can anyone please 
 tell me if the Power Control Module is the same thing I would also 
find 
 in a Micor Mobile Radio? 
 
 Thanks Don 
 
 KA9QJG





[Repeater-Builder] Re: 220 link radios

2007-09-13 Thread ac6vj


To amplify on Skipp's statement about ADI radios, I have a 220 
repeater in Skipp's vault on Mount Vaca, and I was using an ADI 220 
radio to monitor it.  It was on constantly for about six months; the 
display would become unintelligible, and the radio would stop 
transmitting.  I would do a hard reset, and it would start working 
again; but it would lose all its programming.  I finally gave up and 
purchased a new ALINCO a year ago and have been pleased with the 
radio, it just keeps percolating along.

Gregory AC6VJ


--- In Repeater-Builder@yahoogroups.com, skipp025 [EMAIL PROTECTED] 
wrote:

 QST wrote a 224 MHz radio review a few years back and I had been 
 meaning to save it. Three or four of the available 224 MHz radios 
 were covered.  Alinco, ADI, Kenwood, Icom and someone else... at
 least. 
 
 Alinco Radios have a pretty good reputation and my ham friend likes 
 to beat the snot out of his gear... yet it keeps on playing like 
 the day it was built. Of the two Alinco Radios that I know were 
 returned for service... both were fixed right the first time and 
 returned in a semi normal amount of time. 
 
 ADI radios have had reports inbound about the display failing... 
and 
 no replacement. I have yet to confirm that report but I have heard 
 it from a number of people/places. But ADI radios are also sold for 
 really cheap prices. 
 
 I've got a few Kenwood TM-331 radios and they work pretty good for 
 what they are. I also have and love my original 3530 Kenwood but 
it's 
 long out of production. 
 
 The Icom IC-37a? is/was a very popular radio in its day... but had 
 reports of the PA Module failing in more than a few cases. If 
 you can find a used radio, simply throttle the power back and/or 
 run it on the low power setting. Nice compact size radio... 
 
 The QST Magazine review was pretty good... in addition to the 
normal 
 ham band operation... one or two of the radios also provided a 
measure 
 of receive (only) frequency coverage well past the ham bands. One 
 radio model even included an AM detector, which I thought was 
pretty 
 neat.  Just add a bfo and notch filter and you could listen into 
 SSB  ACSB trunking traffic (if there's any left out there...).  
There 
 might even be some special AM Aircraft traffic available well above 
 224 MHz if the receiver will program more like a wide band scanner. 
 
 cheers, 
 skipp 
 
 
  Jed Barton wrote:
   Hey guys,
   Any good radios to use for 220 linking?  I know Alinco makes 
   the DR235, but the PL decoder stinks on it.
  
  http://www.irlpcables.com/AlincoTS64.html
  
   Anything from tait or anything else to suggest?
   I need a few of these.
 





[Repeater-Builder] MICOR parts wanted

2007-09-10 Thread ac6vj
Hi, I'm looking for two KXN1082 channel elements and two low band hi hi 
split receiver boards TLB6854 or TLB6864.  Please let me know if you 
have any you would like to sell and how much you want for them.

Gregory AC6VJ
[EMAIL PROTECTED]



[Repeater-Builder] Re: MICOR parts wanted

2007-09-10 Thread ac6vj

Whoops sorry fat fingers at work, I meant KXN1028 channel elements.


--- In Repeater-Builder@yahoogroups.com, ac6vj [EMAIL PROTECTED] wrote:

 Hi, I'm looking for two KXN1082 channel elements and two low band hi
hi
 split receiver boards TLB6854 or TLB6864. Please let me know if you
 have any you would like to sell and how much you want for them.

 Gregory AC6VJ
 [EMAIL PROTECTED]






[Repeater-Builder] Re: Department of Forestry Tower, Any Experiance???

2005-07-29 Thread ac6vj
Alexander, I just put up a 2 meter repeater with a link radio on a 
California Department of Forestry lookout tower. It took me more 
than two years to find the right person to get permission from, but 
once I was introduced to the division commander it was smooth 
sailing from then on.  Besides free rent, the site includes free 
electricity.  I did have to supply my own cabinet, which is an old 
traffic signal box.  The tower is no longer used for a lookout, so I 
was able to mount directly to the handrail around the top of the 
tower with a 20 foot piece of galvanized pipe to get above the 
lookout shack, and mounted the link Yagi directly to the handrail.

Gregory AC6VJ  


--- In Repeater-Builder@yahoogroups.com, Alexander N Tubonjic 
[EMAIL PROTECTED] wrote:
   Hello All,
  The local department of Forestry has an observation tower that is
 over 200' off the ground. I would like to put my UHF Amateur 
repeater
 on that tower. I stopped by yesterday and talked to the Fire 
Fighter
 that was stationed there. He had told me that cellphone companies 
had
 asked if they could put some equipment on the tower and the DOF 
flat
 out said no; however, the guy I talked to said a friend of his was 
a
 Ham and had expressed an interest in putting a Ham repeater on the
 tower and it was okayed but the Ham moved before anything was put 
into
 effect. The guy I talked with said to leave my contact information 
and
 he would pass it on to his boss and have him contact me with more
 information.
I was wondering if anyone has done anything tower related with 
the
 Department of Forestry? If so what was your experiance like? I
 remember reading somewhere that hams and the DOF have an MOU 
together
 for tower space, anyone know anything about that? Any past 
experiances
 and tips would be greatly appreciated. Thanks and 73.
  Alexander KG4OGN






 
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[Repeater-Builder] MOTORLA ID

2004-04-06 Thread ac6vj
Could someone please tell me what this MOTORLA consolette is
E51JJB1490CM

Thank you Gregory AC6VJ





 
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[Repeater-Builder] Low Band MICOR

2003-11-29 Thread ac6vj
Does anyone have a MICOR Low Band Low Split or Medium Split thay 
would like to sell.
Gregory Gordon AC6VJ  ([EMAIL PROTECTED])




 

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