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FS: MTR2000 Repeater Interface PC Board
I have 2 unpopulated PC boards from Sierra Radio used to interface with a MTR2000.? The connectors are not soldered to the board yet.
I don't have a schematic or parts list available for the PC board.? Sierra Radio should be able to supply this? $29.00 including Priority Mail shipping. |
Re: Bulkheads
Jim W7RY
开云体育These are 100% totally overboard for a home.Use a 2" pvc conduit sleeve (or large enough to pass your current and future needs) through the wall of you home. 73, Jim W7RY On 11/24/2022 11:31 AM, Dan Woodie
wrote:
Don't ever use that garbage.? Buy proper entry port, cushions, and boots.? They are readily available from Tessco.? Below is a 2-port 4" entry port I used at my repeater site.? Use a masonry hole saw to cut the holes then mount and seal this plate.? Get cushions appropriate for the cable size and number of cables used.? Below are some examples.? Remember you should have a ground kit on each cable outside of this port bonded to your EGB and a PolyPhaser on the inside bonded to your MBB/MGB - so installing this should be as easy as pushing 1 ft of cable through the port, installing the cushion and boot, tightening it up, and connecting the coax to the PolyPhaser.? Make sure you leave the provided rubber port covers on any unused entry ports.? Whatever you do, DO NOT do the hack thing and try to turn a port cover into a boot/cushion.? I have seen this too many times when idiots take a utility knife and just cut a hole - then they may try to seal it with Butyl which dries out and falls off over time.? None of this stuff is that expensive - just buy the right parts. --
Thanks and 73, Jim W7RY |
Re: Bulkheads
Jim W7RY
开云体育In my opinion...NO! That's what calking is for. These things have horrible return loss figures. 73, Jim W7RY On 11/24/2022 10:38 AM, Lewis Horn
wrote:
Is it better to use a bulkhead like this to run cable through concrete block or run a tube with heliax? ?We are in an area where we have small critter problems like lizards and mice. --
Thanks and 73, Jim W7RY |
Re: any motorola cabinet keys for sale?
sp? Southern Pacific?
That's what comes to mind to this old RR tech. Did you mean 'special'? 73, Nate, N0NB -- "The optimist proclaims that we live in the best of all possible worlds. The pessimist fears this is true." Web: Projects: GPG fingerprint: 82D6 4F6B 0E67 CD41 F689 BBA6 FB2C 5130 D55A 8819 |
Re: any motorola cabinet keys for sale?
A lot of tower companies are banning cabinets altogether to keep people from "sneaking" in more radios.? Some radios |
Re: Bulkheads
Hello Lewis, Do not use those "connectors" on anything above HF if at all.? They are a waste of good money!? We purchased an assortment of the various lengths.? Ran them through the RF lab and found them to be so bad we tossed them in the junk.? We cut one of the short ones up and found a spring connecting the two center pins!? If it's not Amphenol, Kings, etc. I don't use it!? Save your radio finals, use good connectors.? I also do not use UHF connectors on anything if I can help it.? Too lossy, poor connection, etc.? I use N or better at home. A PVC rain tight box outside with a PVC pipe through the wall to another PVC pull box inside with Poly-phasers as others have suggested is highly recommended.? Ground rods outside with each cable grounded to as others have recommended is the way to go especially since you live in Florida where lightning is the heaviest in the world!?? You can also put the Poly-phasers in the outside pull box on a copper busbar and eliminate the inside box.? Just bring in a heavy ground line too and ground all your equipment to it.? A short busbar with a dozen or so holes works great.? All depends on the size of your station and the number of antennas. DX engineering has everything you need.? Their PCV boxes, ground bars, lightning arrestors, etc are of high quality and have reasonable prices.? If you know someone with a commercial account with Tessco or Hutton better yet. Do it right, do it once.? Not to mention protect your equipment and house from lightning as much as possible!? And if it looks good, the XYL may not mind it too! 73, Shanon KA8SPW On Thu, Nov 24, 2022 at 11:38 AM Lewis Horn <hornl@...> wrote:
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Re: Bulkheads
When in the cell industry, the cell sites used the large hole bulkhead entry points for the coax and GPS cables.? One of the ports at one cell site did not have the boot on it and I had the <redacted> scared out of me when I opened the building's door and a bird flew into my face.? After that, to keep the critters out, a 'critter proof' expanding foam (bought at Granger, but i've seen it at the big box home improvement stores as well) was squirted into the bulkhead "pipe" after the cables were installed, and then the boot placed over that. The foam wasn't too bad to remove if the cable needed to be changed. Eric WB6TIX |
Re: Bulkheads
Well, I feel silly. I only looked at the pic of the eBay listing and ASSumed those were UHF bulkheads. After I sent the email I went to close the eBay browser window and saw they say they are type N, not UHF. I've never seen, let alone measured, an extended-length type N bulkhead like that; lacking any data I'd stay away from them. I'm quite certain that none of the well-known and reputable manufacturers make extended-length type N bulkheads.
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--- Jeff WN3A -----Original Message----- |
Re: Bulkheads
Is it better to use a bulkhead like this to run cable through concrete block or run a tube with heliax?You didn't say what the intended use was (HF rig, VHF/UHF rig, repeater, ???), but generally speaking, you do NOT want to use any kind of extended-length UHF bulkhead feedthrough like that. The impedance of any "UHF" device is quite a ways off 50 ohms, typically in the 30-40 ohm range depending on dielectric. A 4-inch bulkhead would effectively be a 35 ohm Q-section on 440 - your 50 ohm antenna would become a 25 ohm load (2:1 VSWR) as seen by your radio. Again, I don't know all of the details of your installation, but my first instinct whenever running cables through a wall is to use a Microflect port... --- Jeff WN3A -- This email has been checked for viruses by Avast antivirus software. www.avast.com |
Re: Bulkheads
Don't ever use that garbage.? Buy proper entry port, cushions, and boots.? They are readily available from Tessco.? Below is a 2-port 4" entry port I used at my repeater site.? Use a masonry hole saw to cut the holes then mount and seal this plate.? Get cushions appropriate for the cable size and number of cables used.? Below are some examples.? Remember you should have a ground kit on each cable outside of this port bonded to your EGB and a PolyPhaser on the inside bonded to your MBB/MGB - so installing this should be as easy as pushing 1 ft of cable through the port, installing the cushion and boot, tightening it up, and connecting the coax to the PolyPhaser.? Make sure you leave the provided rubber port covers on any unused entry ports.? Whatever you do, DO NOT do the hack thing and try to turn a port cover into a boot/cushion.? I have seen this too many times when idiots take a utility knife and just cut a hole - then they may try to seal it with Butyl which dries out and falls off over time.? None of this stuff is that expensive - just buy the right parts.
Dan Woodie, CETsr KC8ZUM |
Re: Bulkheads
Lewis,
You can cut a hole in the concrete (I assume you are talking about the foundation)? then install ABS pipe, which is rugged. If the wife objects on the color, and you want to use the white PVC use the heavy thickness of schedule 40 or 80.? A third choice is the "gray stuff" electrical pipe, again use the heavy thickness type. I've done all three type and settled on the later, because of it's neutral color.? My wife does not care on the color. Next, seal the (little) space between the pipe's outer surface and the concrete walls (hole).? When you have installed all the lines you can seal it with foam (cheap) way or the correct way are "donuts" around the lines. There's a lot of slang around the amateur community.? "Heliax" is just a brand of hard-line so be aware there are other ones out there.?? Full copper jacket is all well and fine, but sounds like a little overkill for your station at home??? Unless you are concerned about coupling from one line to another.?? With that thought in mind how many line runs are you planning? As with any install, plan ahead for expansion. It's like a hard drive, if you think you need a 100GB, get a 200. ? If you are following R-56 standards and want surge protection you can install protectors, called SPDs (surge protection device) and there are different brands out there.? ? The line would come into the house/shop and within a few inches install the SPDs. Also, they need to be grounded to something well.? Don't rely on water pipes and such.?? Lighting protection is the process of "managing" a million volts down to a few kilovolts; something you can work with.? You want all the equipment to rise and fall at the same potential.? This is speaking in a few microseconds. There are other points to ground from the tower, but it's in the manual. That's the short story; the R-56 manual is huge and could take you a year to understand however it's the world standard on this subject. I hope that helps. -- - Regards, Karl Shoemaker To contact me, please visit SRG's web site at? for the current email address. |
Re: any motorola cabinet keys for sale?
I've never heard of a 2131 but I do have a 2253 if I recall correctly. It was a rare bird and only opened up certain Motorola cabinets.. The 2553 was the more common one for the older upright jobs. I wouldn't be surprised if there was some other offbeat versions out there On Thu, Nov 24, 2022, 10:24 AM TIM HARDY <w7trh@...> wrote: Hello Group, |
Re: Correct email address for N6CES
Thanks Kevin, and for all the work you do for us. Happy Thanksgiving Frank? N6CES? On Thu, Nov 24, 2022, 4:53 AM Kevin Custer <kuggie@...> wrote:
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Bulkheads
开云体育Is it better to use a bulkhead like this to run cable through concrete block or run a tube with heliax? ?We are in an area where we have small critter problems like lizards and mice.Thanks and Happy turkey day!!!! KD6YTS? |
Re: any motorola cabinet keys for sale?
Hello Group,
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I have a "2131" key. Could not find it on the list. As I recall, it was with some hamfest treasures forty years ago. Motorola?? 73 de Tim AE7TH On 11/24/2022 8:06 AM K8TB <k8tb@...> wrote: |
Re: any motorola cabinet keys for sale?
Folks,
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You know when a website has dotted all the dots, when they have an article, (needed), that explains just keys. ??? ??? This is simply put, awesome! To all of you, even though I've been in this hobby for 55 years, and put my first repeater on the air at the age of 18 (over five decades ago), I have learned so much from the folks on this site, and from the repeater builder web site. Yes, we should be thankful for our families, jobs and homes, but having a group like this gives me just that much more knowledge to help out my local amateur radio community. This is a wonderful group of people, and I thank you you all. Tom Bosscher K8TB On 11/23/2022 10:56 PM, Kevin Custer wrote:
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Re: Correct email address for N6CES
开云体育Frank,
It looks like you figured it out on your own.... Let us know if you need further assistance. Happy Thanksgiving, Kevin W3KKC On 11/23/2022 11:51 PM, Frank Perkins wrote:
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Re: any motorola cabinet keys for sale?
Thank you. I stand corrected. It's been too many years. I believe we had both keys 2553 and CH751 on one key tag, hence my erroneous assumption it was one key, The key tag and keys were missing. Only the list/legend remained. It does ring a bell that I've?seen the 2553 that, I believe, looked like the same style key as the 2135. I have MOT 1 keys and others as well. I haven't found my other collection of keys on a 6 inch diameter ring but likely have the 2553 as well. I do have many of the ubiquitous 2135. 73, Kimo KH7U On Wed, Nov 23, 2022 at 5:57 PM Kevin Custer <kuggie@...> wrote: On 11/23/2022 9:34 PM, Eric wrote: |
Re: Correct email address for N6CES
开云体育At the bottom of each email are a number of links including an
unsubscribe link, along with the address that message was sent to. On 11/23/2022 8:51 PM, Frank Perkins
wrote:
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