Re: [Repeater-Builder] Astron switching supply for Battery Charger??

Eric, thanks for your email. What are your comments on a cut-off circuit to open the battery charger, when the battery is fully charged? I would not like to 'cook' the battery. What about a a low voltage circuit that opens the load, for long periods of no AC? I acquired the diodes from Astron,

[Repeater-Builder] Re: Heavy Duty Antenna question....

Doug, Not to take anything from the SCALA antennas, because they can make some pretty impressive antennas, but as indicated, the ultra heavy duty antennas are very spendy. They also make normal antennas that are not designed for extreme conditions. Having said that for 440 MHz I really like the

[Repeater-Builder] Re: Heavy Duty Antenna question....

Thanks for all the recommendations. Fired an email off to Scala, curious to see what they come back with. I read thru a few Scala datasheets... curious that they do not give wind loading with radial ice... and... just my .02 here... from the pictures in their catalog... those antennas sure don'

Re: [Repeater-Builder] Heavy Duty Antenna question....

At 10:07 AM 05/31/10, you wrote: >well, i tried to search, but.. alas, sorting thru 1400+ posts just >isn't going to work. > >i need actual use facts on high altitude (>11k feet), severe duty >antenna selection... i've always been a stationmaster (fiberglass) >antenna guy - and never had a prob

[Repeater-Builder] Re: Heavy Duty Antenna question....

I would look at these Telelwave antennas. We have had very good luck with them on some pretty nasty sites here in Oregon. http://www.telewave.com/pdf/TWDS-7045.pdf 175 MPH wind rating and 150 MPH wind rating with a 1/2" of ice loading. As Fred mentioned Kathrein Scala makes a pretty stout anten

Re: [Repeater-Builder] Heavy Duty Antenna question....

What about bogner? I have seen some pretty HD 700 and 800 mhz antennas from them. I don't know about other bands. - Original Message - From: Repeater-Builder@yahoogroups.com To: Repeater-Builder@yahoogroups.com Sent: Mon May 31 20:25:31 2010 Subject: RE: [Repeater-Builder] Heavy Duty An

RE: [Repeater-Builder] Heavy Duty Antenna question....

Talk to Scala in Medford, OR. I'm sure you've heard of them. They'll make a super heavy duty gain omni if you're willing to pay. They're website is >. I got one NOS some time back second hand and I'm pretty sure meteors, ICBM's, and th

Re: [Repeater-Builder] Re: Help Needed (Guidance and advice) tuning a DB Products Duplexer

I didn't want to overwhelm the gentleman. wa9zzu --- On Mon, 5/31/10, Richard W. Solomon wrote: > From: Richard W. Solomon > Subject: Re: [Repeater-Builder] Re: Help Needed (Guidance and advice) tuning > a DB Products Duplexer > To: Repeater-Builder@yahoogroups.com > Date: Monday, May 31, 201

Re: [Repeater-Builder] Re: Help Needed (Guidance and advice) tuning a DB Products Duplexer

You forgot the most important text: Microwave Spectroscopy by Townes & Shalow. 73, Dick, W1KSZ -Original Message- >From: allan crites >Sent: May 31, 2010 8:38 PM >To: Repeater-Builder@yahoogroups.com >Subject: Re: [Repeater-Builder] Re: Help Needed (Guidance and advice) tuning a >DB P

RE: [Repeater-Builder] Heavy Duty Antenna question....

I have tried DB, Comm. Products, and Antenna Specialist for some Mountain top sites in Montana. None of them held up through the Winter. I finally went to Scala, now Kathrein Scala Division, had them build a tank of an antenna in 1989. To the best of my knowledge they are still in service. Kathrein

Re: [Repeater-Builder] Re: Help Needed (Guidance and advice) tuning a DB Products Duplexer

Kuby, You might start with "Electronic and Radio Engineering" by Frederick Emmons Terman, 4th Ed. 1955 in the Circuit Elements and Circuit Theory section. And try "Radio Engineering Handbook" by Keith Henny, 5th Ed. 1959 in Chapter 6, Wave Guides and Resonators by Harald Schutz. Also "Princi

RE: [Repeater-Builder] Re: Help Needed (Guidance and advice) tuning a DB Products Duplexer

Yes, they did sell window filter as a separate catalog item, but if they were sold as such they would have had a factory sticker on it. The ones I have don't have a sticker, which is why I said they were probably part of a package that would likely have had an SP part number rather than a DB.

[Repeater-Builder] Re: Hamtronics versus Commercial (Kenwood) Repeater Selection

Easy answer. We have a Motorola of that vintage in as a temporary repeater -- our earlier Yaesu/Vertex and TPL amp failed last month after over 12 years of full-time service. We are assembling a new repeater system -- and plan to have the Kenwood TKR-850 as the main component of the new system

Re: [Repeater-Builder] Heavy Duty Antenna question....

I know that Comprod makes a special order, extra heavy-duty line. Might want to contact them. Chuck WB2EDV - Original Message - From: "batwing411" To: Sent: Monday, May 31, 2010 1:07 PM Subject: [Repeater-Builder] Heavy Duty Antenna question > > well, i tried to search, but..

[Repeater-Builder] Heavy Duty Antenna question....

well, i tried to search, but.. alas, sorting thru 1400+ posts just isn't going to work. i need actual use facts on high altitude (>11k feet), severe duty antenna selection... i've always been a stationmaster (fiberglass) antenna guy - and never had a problem... but...i've never put an antenna

[Repeater-Builder] Re: Help Needed (Guidance and advice) tuning a DB Products Duplexer

Anyone have white papers or info on how to modify/design cavities? What would it take to move a window 465 can to 445/435 tunable? What is the design parameters for the N connector straps? What is the design of existing tunable cans (L/C components)? --- In Repeater-Builder@yahoogroups.com, "

[Repeater-Builder] MSR2000 UHF PA parts or whole PA needed.

Hello to all in the group. I have a early A version PA that is going to die soon. It was repaired by a local shop a long time ago. (looks like a CBer did the work) I would like to know. If any one knows if A. Motorola still makes the transistor cards/kit/parts. I phone number that will get

RE: [Repeater-Builder] Re: Help Needed (Guidance and advice) tuning a DB Products Duplexer

Not really. I had not seen this in any of my older catalogs, and I wondered if in fact the unit was made by Decibel Products. Like many RF products, ferrite isolators in particular, the frequency range stated in a manufacturer's catalog refers to the capability to construct- which is not the same

Re: [Repeater-Builder] Legal radios for a repeater

On Mon, 31 May 2010, WD7F - John in Tucson wrote: > Ah ha! Now I have it...your job title explains the comment about Part > 90. de WD7F John in Tucson > > For Part 90 use, something narrowband complaint because the deadline is > > a loomin'. Well, spending $2000 now is usually cheaper than spen

[Repeater-Builder] R2001D Parts/boards

Hi to all here on the group, Is anyone in the group know where I can get parts and boards for the Motorola R2001D service monitor? I'm particularly interested in the A2 and A7 boards. v44kai.Joel. -- I am using the free version of SPAMfighter. We are a community of 7 million users fighti

Re: [Repeater-Builder] Astron switching supply for Battery Charger??

I have been using a Samlex 20 amp switcher to float charge 4 six volt golf car batteries wired in series parallel for the last 5 years, The repeater and packet device are both Syntor X radios and have not been off the air in over 4 years. I keep the voltage set at 13.2 with the power supply wir

Re: [Repeater-Builder] Legal radios for a repeater

Ah ha! Now I have it...your job title explains the comment about Part 90. de WD7F John in Tucson - Original Message - From: "Kris Kirby" To: "terry dalpoas" Cc: Sent: Sunday, May 30, 2010 12:57 PM Subject: Re: [Repeater-Builder] Legal radios for a repeater > On Sat, 29 May 2010, ter

RE: [Repeater-Builder] Astron switching supply for Battery Charger??

John, There's nothing about a switching power supply that might disqualify it for battery float service. However, you should isolate the output of any power supply from the battery with a Schottky diode, so that a failure within the power supply- or the firing of the crowbar SCR- will not impose

[Repeater-Builder] Astron switching supply for Battery Charger??

Hello to the group. Has anyone used an Astron SS series switching supply for a battery float charger? I have seen the info on using the standard Astrons but I like the efficiency of the switcher. Any comments? Thanks in advance. John ab6li

RE: [Repeater-Builder] Re: Help Needed (Guidance and advice) tuning a DB Products Duplexer

Mine don't have labels on them. Usually they were sold as part of an SP package that included the window filters, multicoupler, etc. I haven't tuned or swept this particular set, but from experience, the cavity resonance will tune over a wide swath, probably the full 406-512 MHz, but the loop le