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 lengths may not be optimal over such a wide span (depending on how the cavities are being used), and likewise, the cable lengths will vary. You have something in particular in mind you want me to test? --- Jeff WN3A -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of Eric Lemmon Sent: Sunday, May 30, 2010 12:29 PM To: Repeater-Builder@yahoogroups.com Subject: RE: [Repeater-Builder] Re: Help Needed (Guidance and advice) tuning a DB Products Duplexer Jeff, Can you positively identify the window filters by part number? Also, what is the useful frequency range of the units you purchased? 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com [mailto:Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com ] On Behalf Of Jeff DePolo Sent: Sunday, May 30, 2010 8:39 AM To: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com Subject: RE: [Repeater-Builder] Re: Help Needed (Guidance and advice) tuning a DB Products Duplexer snip I bought two sets of those window filters from the same guy, but I knew what they were, caveat emptor is the golden rule at Dayton or any other hamfest. Actually I think I gave him $75 for the pair, and I took the two cleanest/newest ones he had (the newer dark-tan ones). --- Jeff WN3A snip
[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] 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 a dead short on the battery. After determining the correct float voltage for your battery plant, say, 14.2 VDC, set the output voltage of the power supply slightly higher to account for the small forward voltage drop of the Schottky diode. The load should be connected directly to the battery, not to the power supply. I have several Astron switching power supplies in service, along with several similar units made by Duracomm and Samlex. They have all been extremely reliable, and the high switching frequency results in no perceptible buzz or ripple in the output. A decade ago, some switchers were poorly designed and radiated spurious signals into the HF bands, but none of the name-brand switchers produced today have that problem. In fact, Motorola uses Duracomm and Astec switching power supplies in most of its commercial repeater equipment. One thing to be aware of is that some Astron power supplies, both linear and switching, have an internal jumper that ties the negative output to chassis ground. This jumper must be removed to avoid some problems with ground loops and erratic controller functions. The presence of this jumper can be tested by measuring the DC resistance between the grounding prong of the AC power plug and the negative output terminal. If the resistance is above 10,000 ohms, you're good to go. Otherwise, you've got to get under the hood... 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of ab6li Sent: Monday, May 31, 2010 7:31 AM To: Repeater-Builder@yahoogroups.com Subject: [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] 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 k...@catonic.us To: terry dalpoas km...@yahoo.com Cc: Repeater-Builder@yahoogroups.com Sent: Sunday, May 30, 2010 12:57 PM Subject: Re: [Repeater-Builder] Legal radios for a repeater On Sat, 29 May 2010, terry dalpoas wrote: I was asked the other day by a friend if you could use an older mobile (Micor, Mitrek, Mastr II and Exec) that has been duplexed for a repeater in GMRS, public safety, etc. I told them that I was pretty sure it was legal since the transmitters are FCC type accepted and as long as they transmit a clean signal. Was I correct on this? For ham use, literally anything as long as it doesn't cause harmful interference to other services. For Part 90 use, something narrowband complaint because the deadline is a loomin'. -- Kris Kirby, KE4AHR Disinformation Analyst
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 wired direct to the batteries (through a fuse of course) but find no reason to place a diode in series as the supply must be already protected from back current flow. I picked 13.2 volts because electrolite loss is minimal at that voltage, it may not be the optimum setup but it works for me. I still need to figure out how to equilizie the batteries easily with this set up. tom On 5/31/2010 10:31 AM, ab6li wrote: 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 Yahoo! Groups Links
[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 fighting spam. SPAMfighter has removed 836 of my spam emails to date. Get the free SPAMfighter here: http://www.spamfighter.com/len The Professional version does not have this message
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 spending $500 now and $2000 later. Even if it takes three years to implement; swapping out a fleet of 100 - 2500 radios takes time. -- Kris Kirby, KE4AHR Disinformation Analyst
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 as the field-tunable range of a specific product. I was curious if the window filter (AKA preselector) could be useful in the 70 cm Amateur band without modifying the coupling loops or jumper cables. 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of Jeff DePolo Sent: Monday, May 31, 2010 6:09 AM To: Repeater-Builder@yahoogroups.com Subject: 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 lengths may not be optimal over such a wide span (depending on how the cavities are being used), and likewise, the cable lengths will vary. You have something in particular in mind you want me to test? --- Jeff WN3A -Original Message- From: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com [mailto:Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com ] On Behalf Of Eric Lemmon Sent: Sunday, May 30, 2010 12:29 PM To: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com Subject: RE: [Repeater-Builder] Re: Help Needed (Guidance and advice) tuning a DB Products Duplexer Jeff, Can you positively identify the window filters by part number? Also, what is the useful frequency range of the units you purchased? 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com [mailto:Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com ] On Behalf Of Jeff DePolo Sent: Sunday, May 30, 2010 8:39 AM To: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com Subject: RE: [Repeater-Builder] Re: Help Needed (Guidance and advice) tuning a DB Products Duplexer snip I bought two sets of those window filters from the same guy, but I knew what they were, caveat emptor is the golden rule at Dayton or any other hamfest. Actually I think I gave him $75 for the pair, and I took the two cleanest/newest ones he had (the newer dark-tan ones). --- Jeff WN3A snip
[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 me to the correct people if they still have the parts. All the numbers I have found online don't seem to contact the correct person. Or, if someone has a PA that they would like to sell or trade. The PA I have now is the intermittent duty PA. I have VHF msr2000 stations, full duty PA's etc. Will trade a full VHF MSR2000 with 100 watt full duty PA, for a UHF PA. Thanks
[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, Eric Lemmon wb6...@... wrote: 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 as the field-tunable range of a specific product. I was curious if the window filter (AKA preselector) could be useful in the 70 cm Amateur band without modifying the coupling loops or jumper cables. 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of Jeff DePolo Sent: Monday, May 31, 2010 6:09 AM To: Repeater-Builder@yahoogroups.com Subject: 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 lengths may not be optimal over such a wide span (depending on how the cavities are being used), and likewise, the cable lengths will vary. You have something in particular in mind you want me to test? --- Jeff WN3A -Original Message- From: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com [mailto:Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com ] On Behalf Of Eric Lemmon Sent: Sunday, May 30, 2010 12:29 PM To: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com Subject: RE: [Repeater-Builder] Re: Help Needed (Guidance and advice) tuning a DB Products Duplexer Jeff, Can you positively identify the window filters by part number? Also, what is the useful frequency range of the units you purchased? 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com [mailto:Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com ] On Behalf Of Jeff DePolo Sent: Sunday, May 30, 2010 8:39 AM To: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com Subject: RE: [Repeater-Builder] Re: Help Needed (Guidance and advice) tuning a DB Products Duplexer snip I bought two sets of those window filters from the same guy, but I knew what they were, caveat emptor is the golden rule at Dayton or any other hamfest. Actually I think I gave him $75 for the pair, and I took the two cleanest/newest ones he had (the newer dark-tan ones). --- Jeff WN3A snip
[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 up at this height. i am going to need something good for 150+ MPH winds, ICE, etc. Open to ideas.
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 batwing...@yahoo.com To: Repeater-Builder@yahoogroups.com Sent: Monday, May 31, 2010 1:07 PM Subject: [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 up at this height. i am going to need something good for 150+ MPH winds, ICE, etc. Open to ideas. Yahoo! Groups Links No virus found in this incoming message. Checked by AVG - www.avg.com Version: 9.0.819 / Virus Database: 271.1.1/2908 - Release Date: 05/31/10 02:25:00
[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 ! g. beat
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. These cavities are very tightly coupled, typically about 0.3 dB or so insertion loss per cavity. Strung together, the total insertion loss is about 1.5 dB. Because of the coupling, each cavity individually doesn't have a very high Q, so if you were to take one of these units and split it to try to make a duplexer out of it, you'd probably only get about 40 dB or so of isolation at 5 MHz offset. Even if you did want to try it, you'd have to change cable lengths to get the pass response of each cavity to add on-frequency rather than creating a wide window filter passband as they were originally cabled. They do tune fine down to 440 as-is (i.e. as a window filter). --- Jeff -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of Eric Lemmon Sent: Monday, May 31, 2010 12:52 PM To: Repeater-Builder@yahoogroups.com Subject: 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 as the field-tunable range of a specific product. I was curious if the window filter (AKA preselector) could be useful in the 70 cm Amateur band without modifying the coupling loops or jumper cables. 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com [mailto:Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com ] On Behalf Of Jeff DePolo Sent: Monday, May 31, 2010 6:09 AM To: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com Subject: 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 lengths may not be optimal over such a wide span (depending on how the cavities are being used), and likewise, the cable lengths will vary. You have something in particular in mind you want me to test? --- Jeff WN3A -Original Message- From: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com [mailto:Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com ] On Behalf Of Eric Lemmon Sent: Sunday, May 30, 2010 12:29 PM To: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com Subject: RE: [Repeater-Builder] Re: Help Needed (Guidance and advice) tuning a DB Products Duplexer Jeff, Can you positively identify the window filters by part number? Also, what is the useful frequency range of the units you purchased? 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com [mailto:Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com ] On Behalf Of Jeff DePolo Sent: Sunday, May 30, 2010 8:39 AM To: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com Subject: RE: [Repeater-Builder] Re: Help Needed (Guidance and advice) tuning a DB Products Duplexer snip I bought two sets of those window filters from the same guy, but I knew what they were, caveat emptor is the golden rule at Dayton or any other hamfest. Actually I think I gave him $75 for the pair, and I took the two cleanest/newest ones he had (the newer dark-tan ones). --- Jeff WN3A snip
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 Principals of Radar 3rd Ed. 1952 by J. Francis Reintjes and Godfrey T. Coate in ch.9, Resonant Lines and Cavities. And Microwave Transmission Design Data by Theodore Moreno, 1948, ch. 13 Cavity Resonators. Then when you finish with these publications you will have all the answers to all your questions and then some. WA9ZZU --- On Mon, 5/31/10, Kuby n6...@yahoo.com wrote: From: Kuby n6...@yahoo.com Subject: [Repeater-Builder] Re: Help Needed (Guidance and advice) tuning a DB Products Duplexer To: Repeater-Builder@yahoogroups.com Date: Monday, May 31, 2010, 1:22 PM 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, Eric Lemmon wb6...@... wrote: 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 as the field-tunable range of a specific product. I was curious if the window filter (AKA preselector) could be useful in the 70 cm Amateur band without modifying the coupling loops or jumper cables. 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of Jeff DePolo Sent: Monday, May 31, 2010 6:09 AM To: Repeater-Builder@yahoogroups.com Subject: 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 lengths may not be optimal over such a wide span (depending on how the cavities are being used), and likewise, the cable lengths will vary. You have something in particular in mind you want me to test? --- Jeff WN3A -Original Message- From: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com [mailto:Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com ] On Behalf Of Eric Lemmon Sent: Sunday, May 30, 2010 12:29 PM To: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com Subject: RE: [Repeater-Builder] Re: Help Needed (Guidance and advice) tuning a DB Products Duplexer Jeff, Can you positively identify the window filters by part number? Also, what is the useful frequency range of the units you purchased? 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com [mailto:Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com ] On Behalf Of Jeff DePolo Sent: Sunday, May 30, 2010 8:39 AM To: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com Subject: RE: [Repeater-Builder] Re: Help Needed (Guidance and advice) tuning a DB Products Duplexer snip I bought two sets of those window filters from the same guy, but I knew what they were, caveat emptor is the golden rule at Dayton or any other hamfest. Actually I think I gave him $75 for the pair, and I took the two cleanest/newest ones he had (the newer dark-tan ones). --- Jeff WN3A snip
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 Scala has a web site and a catalog to view. Good Luck Fred W5VAY _ From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of batwing411 Sent: Monday, May 31, 2010 12:07 PM To: Repeater-Builder@yahoogroups.com Subject: [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 up at this height. i am going to need something good for 150+ MPH winds, ICE, etc. Open to ideas.
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 wa9...@arrl.net 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 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 Principals of Radar 3rd Ed. 1952 by J. Francis Reintjes and Godfrey T. Coate in ch.9, Resonant Lines and Cavities. And Microwave Transmission Design Data by Theodore Moreno, 1948, ch. 13 Cavity Resonators. Then when you finish with these publications you will have all the answers to all your questions and then some. WA9ZZU --- On Mon, 5/31/10, Kuby n6...@yahoo.com wrote: From: Kuby n6...@yahoo.com Subject: [Repeater-Builder] Re: Help Needed (Guidance and advice) tuning a DB Products Duplexer To: Repeater-Builder@yahoogroups.com Date: Monday, May 31, 2010, 1:22 PM 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, Eric Lemmon wb6...@... wrote: 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 as the field-tunable range of a specific product. I was curious if the window filter (AKA preselector) could be useful in the 70 cm Amateur band without modifying the coupling loops or jumper cables. 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of Jeff DePolo Sent: Monday, May 31, 2010 6:09 AM To: Repeater-Builder@yahoogroups.com Subject: 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 lengths may not be optimal over such a wide span (depending on how the cavities are being used), and likewise, the cable lengths will vary. You have something in particular in mind you want me to test? --- Jeff WN3A -Original Message- From: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com [mailto:Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com ] On Behalf Of Eric Lemmon Sent: Sunday, May 30, 2010 12:29 PM To: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com Subject: RE: [Repeater-Builder] Re: Help Needed (Guidance and advice) tuning a DB Products Duplexer Jeff, Can you positively identify the window filters by part number? Also, what is the useful frequency range of the units you purchased? 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com [mailto:Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com ] On Behalf Of Jeff DePolo Sent: Sunday, May 30, 2010 8:39 AM To: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com Subject: RE: [Repeater-Builder] Re: Help Needed (Guidance and advice) tuning a DB Products Duplexer snip I bought two sets of those window filters from the same guy, but I knew what they were, caveat emptor is the golden rule at Dayton or any other hamfest. Actually I think I gave him $75 for the pair, and I took the two cleanest/newest ones he had (the newer dark-tan ones). --- Jeff WN3A snip
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 w1...@earthlink.net wrote: From: Richard W. Solomon w1...@earthlink.net Subject: Re: [Repeater-Builder] Re: Help Needed (Guidance and advice) tuning a DB Products Duplexer To: Repeater-Builder@yahoogroups.com Date: Monday, May 31, 2010, 8:09 PM You forgot the most important text: Microwave Spectroscopy by Townes Shalow. 73, Dick, W1KSZ -Original Message- From: allan crites wa9...@arrl.net 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 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 Principals of Radar 3rd Ed. 1952 by J. Francis Reintjes and Godfrey T. Coate in ch.9, Resonant Lines and Cavities. And Microwave Transmission Design Data by Theodore Moreno, 1948, ch. 13 Cavity Resonators. Then when you finish with these publications you will have all the answers to all your questions and then some. WA9ZZU --- On Mon, 5/31/10, Kuby n6...@yahoo.com wrote: From: Kuby n6...@yahoo.com Subject: [Repeater-Builder] Re: Help Needed (Guidance and advice) tuning a DB Products Duplexer To: Repeater-Builder@yahoogroups.com Date: Monday, May 31, 2010, 1:22 PM 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, Eric Lemmon wb6...@... wrote: 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 as the field-tunable range of a specific product. I was curious if the window filter (AKA preselector) could be useful in the 70 cm Amateur band without modifying the coupling loops or jumper cables. 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of Jeff DePolo Sent: Monday, May 31, 2010 6:09 AM To: Repeater-Builder@yahoogroups.com Subject: 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 lengths may not be optimal over such a wide span (depending on how the cavities are being used), and likewise, the cable lengths will vary. You have something in particular in mind you want me to test? --- Jeff WN3A -Original Message- From: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com [mailto:Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com ] On Behalf Of Eric Lemmon Sent: Sunday, May 30, 2010 12:29 PM To: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com Subject: RE: [Repeater-Builder] Re: Help Needed (Guidance and advice) tuning a DB Products Duplexer Jeff, Can you positively identify the window filters by part number? Also, what is the useful frequency range of the units you purchased? 73, Eric Lemmon WB6FLY -Original Message- From:
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 http://www.kathrein-scala.com http://www.kathrein-scala.com/ . I got one NOS some time back second hand and I'm pretty sure meteors, ICBM's, and the like will bounce right off of it. Gary -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of batwing411 Sent: Monday, May 31, 2010 10:07 AM To: Repeater-Builder@yahoogroups.com Subject: [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 up at this height. i am going to need something good for 150+ MPH winds, ICE, etc. Open to ideas. Yahoo! Groups Links http://groups.yahoo.com/group/Repeater-Builder/ Individual Email | Traditional http://groups.yahoo.com/group/Repeater-Builder/join (Yahoo! ID required) repeater-builder-dig...@yahoogroups.com repeater-builder-fullfeatu...@yahoogroups.com repeater-builder-unsubscr...@yahoogroups.com http://docs.yahoo.com/info/terms/
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 Repeater-Builder@yahoogroups.com To: Repeater-Builder@yahoogroups.com Repeater-Builder@yahoogroups.com Sent: Mon May 31 20:25:31 2010 Subject: 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 http://www.kathrein-scala.com http://www.kathrein-scala.com/ . I got one NOS some time back second hand and I’m pretty sure meteors, ICBM’s, and the like will bounce right off of it. Gary -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of batwing411 Sent: Monday, May 31, 2010 10:07 AM To: Repeater-Builder@yahoogroups.com Subject: [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 up at this height. i am going to need something good for 150+ MPH winds, ICE, etc. Open to ideas. Yahoo! Groups Links http://groups.yahoo.com/group/Repeater-Builder/ Individual Email | Traditional http://groups.yahoo.com/group/Repeater-Builder/join (Yahoo! ID required) repeater-builder-dig...@yahoogroups.com repeater-builder-fullfeatu...@yahoogroups.com repeater-builder-unsubscr...@yahoogroups.com http://docs.yahoo.com/info/terms/
[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 antenna also. I would think either one of these companies could come up with a solution for you that would outlast a fiberglass antenna in your extreme conditions. Good Luck, Joe - WA7JAW _ From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of batwing411 Sent: Monday, May 31, 2010 12:07 PM To: Repeater-Builder@yahoogroups.com Subject: [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 up at this height. i am going to need something good for 150+ MPH winds, ICE, etc. Open to ideas.
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 problem... but...i've never put an antenna up at this height. i am going to need something good for 150+ MPH winds, ICE, etc. Open to ideas. One word: Scala.They are in Medford, Oregon. Phone 541-779-6500 Email is communications at kathrein dot com Kathrein-Werke KG of Germany bought them but everyone I know of still calls them Scala. The Cal Tech Seismo Lab has a bunch of radio linked seismographs and one is on Mt Whitney at 14,500 feet. Another is on Mount San Antonio (also known as Mt Baldy) at over 10,000 feet. Those plus a lot more seismographs at lower altitudes all use Scala beams. Now those are beams but I've seen Scala Omni antennas as well. They are TOUGH. In short, Scala make antennas that survive, but they are not cheap. http://www.kathrein-scala.com/ main web site http://www.kathrein-scala.com/vhf-high.htm VHF High Band http://www.kathrein-scala.com/uhf-mobile.htm UHF Despite the words uhf mobile they make UHF station antennas as well. I'd get their catalog, as well as the ones from Sinclair and Telewave and maybe even Bogner. Just be sitting down when you get to pricing out your new toy. Years ago a friend could not afford the Scala he wanted, so he took lots of photos of one that was already in place at a different site. Those photos were blown up to 8x10s (I had access to an enlarger and a darkroom then) and he took them over to his brother-in-law the welder. A couple of weeks later he had a homebrew copy of a Scala VHF Omni with a reflector (think 8 foot tall corner reflector) A trip to the galvanizers and then to the mountaintop resulted in a very LOUD system Mike WA6ILQ
[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't look very durable to me... keep the recommendations coming - specific models would be quite helpful (especially at 440MHz) doug
