Re: [Repeater-Builder] Re: Ok, here's a weird one....
If you are going to leave the long end open and still have a problem a .001 cap to ground often will solve it From: Nate Duehr [EMAIL PROTECTED] Reply-To: Repeater-Builder@yahoogroups.com To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] Re: Ok, here's a weird one Date: Wed, 14 Feb 2007 21:10:28 -0700 On 2/14/07, Eric Lemmon [EMAIL PROTECTED] wrote: And, in most cases, the cable shield should be grounded only on the receiving end, to minimize noise pickup. 73, Eric Lemmon WB6FLY Now that's a trick I wasn't aware of, but it makes intuitive sense. Thanks Eric. Nate WY0X _ Advertisement: Fresh jobs daily. Stop waiting for the newspaper. Search Now! www.seek.com.au http://a.ninemsn.com.au/b.aspx?URL=http%3A%2F%2Fninemsn%2Eseek%2Ecom%2Eau_t=757263760_r=Hotmail_EndText_Dec06_m=EXT
[Repeater-Builder] Re: Icom portable repeater help
Nothing fancy... single-shielded RG-58U. That's an interesting thought that hadn't occurred to me. And with my vertical-separation setup with the TX antenna up high, that could certainly be a factor. - Brian --- In Repeater-Builder@yahoogroups.com, Ralph Mowery [EMAIL PROTECTED] wrote: --- Brian Rau [EMAIL PROTECTED] wrote: Thanks for your input, I was hoping to hear from someone who had experience with this kind of rig. I've been trying the vertical antenna separation tactic, which *in theory* puts the antennas in each others' nulls, but I think the reality is that there's enough pattern distortion, signal reflection, etc to make it unworkable. I just was looking for a sanity check before spending the bucks on the duplexer. Brian K9JVA Were you using double shielded coax or hardling ? If you run single shielded coax next to each other or past one of the antennas you usualy get desense. Need Mail bonding? Go to the Yahoo! Mail QA for great tips from Yahoo! Answers users. http://answers.yahoo.com/dir/?link=listsid=396546091
Re: [Repeater-Builder] Antenna cleaning solvent ???
Wouldn't the pitting give the antenna more surface area, broader bandwidth, and more gain? DE NU5D On 2/14/07, John [EMAIL PROTECTED] wrote: What is a good cleaning solvent for aluminum repeater antennas? I have an antenna that was exposed to the weather for years and it has become pitted and dirty from the enviroment. Thanks, John -- Ham Radio Spoken Here.NU5D Visit the Temple Ham Club Website http://www.tarc.org
RE: [Repeater-Builder] Antenna cleaning solvent ???
Was with vinegar , then rinse and polish with a good auto cream From: John [EMAIL PROTECTED] Reply-To: Repeater-Builder@yahoogroups.com To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] Antenna cleaning solvent ??? Date: Thu, 15 Feb 2007 03:16:36 - What is a good cleaning solvent for aluminum repeater antennas? I have an antenna that was exposed to the weather for years and it has become pitted and dirty from the enviroment. Thanks, John _ Advertisement: Meet Sexy Singles Today @ Lavalife - Click here http://a.ninemsn.com.au/b.aspx?URL=http%3A%2F%2Flavalife9%2Eninemsn%2Ecom%2Eau%2Fclickthru%2Fclickthru%2Eact%3Fid%3Dninemsn%26context%3Dan99%26locale%3Den%5FAU%26a%3D23769_t=754951090_r=endtext_lavalife_dec_meet_m=EXT
Re: [Repeater-Builder] Antenna cleaning solvent ???
Auto part stores carry Aluminum wheel cleaner, it is a strong chemical that strips off oxidation and leaves a clean , raw, surface. The only problem is that raw aluminum starts to oxidize immediately. You will need to covert the antenna with a coating of clear urethane to stop this from happening . This can be done with spray or brush. Lance N2HBA - Original Message - From: John To: Repeater-Builder@yahoogroups.com Sent: Wednesday, February 14, 2007 10:16 PM Subject: [Repeater-Builder] Antenna cleaning solvent ??? What is a good cleaning solvent for aluminum repeater antennas? I have an antenna that was exposed to the weather for years and it has become pitted and dirty from the enviroment. Thanks, John
Re: [Repeater-Builder] Midland XTR question...
Vincent McKever wrote: There is a COS point on the main board. A pair of midland radios will make a great repeater and one will make an easy remote. Much better that a GE or Motorola. Try it, you'll love it. Vincent N6OA Well, I think that is exaggerating a bit, but yeah, they would do a lot better then any made-for-ham stuff... It's still a mobile, and will not handle full tx power in repeater use. -- Jim Barbour WD8CHL
[Repeater-Builder] Re: Ok, here's a weird one....
--- In Repeater-Builder@yahoogroups.com, Ken Arck [EMAIL PROTECTED] wrote: Have a customer with the following issue: Scenario: Amateur repeater (Mastr II) installed at a 100,000 FM radio xmtr site. Issue: Very low level audio of radio station appears on Mastr II's xmtr (yes, external controller). Repeater owner hasn't fully explained what very low level means. But regardless. Question: The only way I see this happening is due to some AM component on radio station's transmitter. Thoughts? Thoughts? I haven't seen it mentioned yet, but yes, this sounds like a classic case of Intermood. The repeater antenna and feed line are passive items, meaning that they don't do anything but sit there with the ability to transmit and receive on different frequencies at the same time! The FM station's 100KW signal comes into the repeater's coax from the antenna, mixes in the repeater's finale which is a nonlinear class C circuit, and gets transmitted on the repeater's output. IF this is the case, a cavity filter tuned to the FM station's signal, at the botom of the coax at the repeater's output, should take out the offending signal. This can be built out of a large tin can, per data on the Internet. Suggest starting with 2 number 10 tin cans stacked and soldered together for that frequency, which would be bigger than one number 10 cavity, made for 2 meters or above. Also to consider, having a 100KW FM broadcast signal right next to a antenna, coax, and repeater receiver rated in the microvolt region, is a lot to expect, overloading the receiver and probably also causing desence in the repeater receiver. A cavity at the repeater receiver, also tuned to the 100KW FM station's carrier, should solve that. Been there, done that! Best wishes, Dick, W7TIO (retired Mobile Radio Communications tech.) Ken --- --- President and CTO - Arcom Communications Makers of the world famous RC210 Repeater Controller and accessories. http://www.arcomcontrollers.com/ Authorized Dealers for Kenwood and Telewave and we offer complete repeater packages! AH6LE/R - IRLP Node 3000 http://www.irlp.net
[Repeater-Builder] Motorola R-1200 Service Monitor
Anybody got a dead/parts 1200 Motorola service monitor??? Looking for a good 1 mhs oscillator module to buy. Mine went dead. Appreciate any help. Contact me at [EMAIL PROTECTED] Thanks, Dale K0JXI
[Repeater-Builder] Re: Ok, here's a weird one....
I haven't seen it mentioned yet, but yes, this sounds like a classic case of Intermood. I don't think it is classic intermod. Think about it. The deviation of the broadcast station is 75 kc. A signal that wide cannot be heard in a receiver designed for 5 kc., except, maybe, VERY distorted, and even then, the squelch circuit usually will not open with such a signal present. I've dealt with FM broadcast intermod on a repeater that I maintain. This one is the classic A+B-C formula. 89.9 + 147.06 - 89.3 = 147.66. Yes, this produces a signal on our 7.66 input, but is VERY wide. It does not manifest itself until, and only until, both broadcast stations have no modulation on them at the same time. Only then does the intermod product become narrow enough to stay within the passband of our receiver and be heard. The instant either broadcast station begins modulating, our squelch closes, and the intermod is not heard. I've traced the mixing to the tower guy wire anchor area. Tower riggers weave cable through the turnbuckles. This creates numerous places where metal is barely touching and rubbing, a great place for mini-diodes and just plain scratching noise too. Placing sections of vinyl insulation in problem areas cures the problem here. Best wishes, Dick, W7TIO (retired Mobile Radio Communications tech.) Ken Laryn K8TVZ
Re: [Repeater-Builder] Re: Ok, here's a weird one....
Umm.. what he said. With another twist or two... Heretofore, it's been assumed the culprit to be main channel RF, because they're hearing main-channel audio... You'll want to consider what *other* things may be going on ~~ * STL (studio-transmitter-link) channels ~ typically in the 950 range, but not always * RPU/IFB channels ~ which generally aren't wide-band, and have been known to run continuously. Laryn Lohman wrote: I haven't seen it mentioned yet, but yes, this sounds like a classic case of Intermood. I don't think it is classic intermod. Think about it. The deviation of the broadcast station is 75 kc. snip.
Re: [Repeater-Builder] Re: 2M Power Amp
Google Primus Distribution Illinois Results: www.primuselectronics.com 73 Charles, KS3Z --- [EMAIL PROTECTED] wrote: In a message dated 2/14/2007 4:58:40 A.M. Pacific Standard Time, [EMAIL PROTECTED] writes: Primus Distribution in Illinois offers a 30-40% discount off Vocom's list price. Do you have some contact information? Nothing shows up on Google. We won't tell. Get more on shows you hate to love (and love to hate): Yahoo! TV's Guilty Pleasures list. http://tv.yahoo.com/collections/265
Re: [Repeater-Builder] Re: Icom portable repeater help
On 2/14/07, Brian Rau [EMAIL PROTECTED] wrote: Nothing fancy... single-shielded RG-58U. That's an interesting thought that hadn't occurred to me. And with my vertical-separation setup with the TX antenna up high, that could certainly be a factor. Usually putting the TX up high is backwards? Any particular reason you went that way? Unless you have other receiver sites, putting the TX higher just makes the machine a bit of an alligator... and now you have to run your power past the receive antenna in the cable, as mentioned by Brian. Nate WY0X
[Repeater-Builder] Re: Midland Low Band Mobile Radios as a Repeater...
Depends on which made for hams stuff you're talking about. Would you consider a comercial low band radio that normally includes the 6 meter band as being made for ham? Aside from the above it's pretty easy to move a lot of commercial radios up to the six meter band. Actually... as hard as a customer of mine has tried... his two low band Midland Syntech mobiles made into a repeater just keep on ticking even though he and his crew seem to enjoy lock to talk rather windy operation. I expected the tx radio pa to burn up years ago but so far the equipment just plays and plays. Not even a fan on the heat sink. So... If you move some serious air past the tx radio pa and/or bolt some additional heatsink mass to the tx pa section. you might just pull off the perfect murder on six meters. ... and at a mucho lower price. cheers, skipp Well, I think that is exaggerating a bit, but yeah, they would do a lot better then any made-for-ham stuff... It's still a mobile, and will not handle full tx power in repeater use. There is a COS point on the main board. A pair of midland radios will make a great repeater and one will make an easy remote. Much better than a GE or Motorola. Try it, you'll love it.
[Repeater-Builder] Antennas that work both in commercial and amateur
Hey guys, I need some suggestions. I need a vhf and a uhf antena. Here's the requirement. I'm planning to operate both amateur and commercial stuff from the house. I'd rather not use a ham antenna in the commercial bands. Are there some that'll do the 136 to 174 split, and some UHF that'll do like 439 to 490? Any ideas? Thanks, Jed
[Repeater-Builder] Re: Antennas that work both in commercial and amateur
Sinclair makes what you're looking for... but you won't like the price... and if their customer service is still as bad as my last experience you won't enjoy trying to resolve any problems that might pop up. cheers, skipp Jed Barton [EMAIL PROTECTED] wrote: Hey guys, I need some suggestions. I need a vhf and a uhf antena. Here's the requirement. I'm planning to operate both amateur and commercial stuff from the house. I'd rather not use a ham antenna in the commercial bands. Are there some that'll do the 136 to 174 split, and some UHF that'll do like 439 to 490? Any ideas? Thanks, Jed
[Repeater-Builder] Re: Antennas that work both in commercial and amateur
Yep... About $10K to $15K worth of crap VHF Antennas bad... Doesn't keep me from buying more... just not the model/type we bought with the problems that have yet to be resolved. I only get a chance to grind on them about it at IWCE each year... every year. Overall Sinclair makes and made great stuff. But I have a large collection of VHF Aluminum Sinclair Edsels in my collection. cheers, skipp Jed Barton [EMAIL PROTECTED] wrote: wow, really, that bad? _ From: skipp025 [mailto:[EMAIL PROTECTED] Sent: Thursday, February 15, 2007 3:36 PM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] Re: Antennas that work both in commercial and amateur Sinclair makes what you're looking for... but you won't like the price... and if their customer service is still as bad as my last experience you won't enjoy trying to resolve any problems that might pop up. cheers, skipp Jed Barton jed@ wrote: Hey guys, I need some suggestions. I need a vhf and a uhf antena. Here's the requirement. I'm planning to operate both amateur and commercial stuff from the house. I'd rather not use a ham antenna in the commercial bands. Are there some that'll do the 136 to 174 split, and some UHF that'll do like 439 to 490? Any ideas? Thanks, Jed
Re: [Repeater-Builder] Antennas that work both in commercial and amateur
If you find one, it would have to be pretty low gain (like Unity). Joe M. Jed Barton wrote: Hey guys, I need some suggestions. I need a vhf and a uhf antena. Here's the requirement. I'm planning to operate both amateur and commercial stuff from the house. I'd rather not use a ham antenna in the commercial bands. Are there some that'll do the 136 to 174 split, and some UHF that'll do like 439 to 490? Any ideas? Thanks, Jed Yahoo! Groups Links
[Repeater-Builder] Re: Antennas that work both in commercial and amateur
Re: Antennas that work both in commercial and amateur
If you find one, it would have to be pretty low gain (like Unity).
Not really... but as the nature of the bandwidth beast is dealt
with... the 4 dipole antenna gain is not super high (about ~3db).
The dipole antenna I have the problem with is the first version of
SRL235NM Antennal model.
The SRL235NM makes an over priced coat hanger but a lousy repeater/
radio antenna.
Check out the SD2352 if you have time. They spec 5db gain from
138-174 MHz. But it's also a real monster to mount on a tower...
cheers,
skipp
[Repeater-Builder] Re: Antennas that work both in commercial and amateur
--- In Repeater-Builder@yahoogroups.com, mch [EMAIL PROTECTED] wrote: If you find one, it would have to be pretty low gain (like Unity). Joe M. Not necessarily Joe. I have a ASPB-602 which is an Antenna Specialists number. It is listed in a DB Products catalog from 1996, and is rated for 144-162 mc. I've run numerous unscientific tests comparing it to unmodified DB224s at the same mounting position and same feedline. Generally better gain than the DB224s. SWR sweep tests show very flat from 144-162 mc. It has large 3/4in OD elements; the DB224 have 3/8 OD elements. Better bandwidth. Unfortunately, I don't think it is made anymore. Laryn K8TVZ
Re: [Repeater-Builder] Re: Antennas that work both in commercial and amateur
I've had issues with the customer service folks at Sinclair also. Will avoid them in the future when I can. Had a circulator that showed up and can't be tuned with the normal adjustments to get it back on track. After several excuses of needing a tax number and then some other documentation, they just stopped answering my emails asking for an RMA. Two years later, I've given up. YMMV Chuck n0nhj skipp025 wrote: Yep... About $10K to $15K worth of crap VHF Antennas bad... Doesn't keep me from buying more... just not the model/type we bought with the problems that have yet to be resolved. I only get a chance to grind on them about it at IWCE each year... every year. Overall Sinclair makes and made great stuff. But I have a large collection of VHF Aluminum Sinclair Edsels in my collection. cheers, skipp Jed Barton [EMAIL PROTECTED] wrote: wow, really, that bad? _ From: skipp025 [mailto:[EMAIL PROTECTED] Sent: Thursday, February 15, 2007 3:36 PM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] Re: Antennas that work both in commercial and amateur Sinclair makes what you're looking for... but you won't like the price... and if their customer service is still as bad as my last experience you won't enjoy trying to resolve any problems that might pop up. cheers, skipp Jed Barton jed@ wrote: Hey guys, I need some suggestions. I need a vhf and a uhf antena. Here's the requirement. I'm planning to operate both amateur and commercial stuff from the house. I'd rather not use a ham antenna in the commercial bands. Are there some that'll do the 136 to 174 split, and some UHF that'll do like 439 to 490? Any ideas? Thanks, Jed Yahoo! Groups Links
RE: [Repeater-Builder] Antennas that work both in commercial and amateur
There are a number of old post on this subject. Take a look at the 4 bay dipole antennas from Antenex (made by Bluewave). VERY broadband. As for whether or not they are expensive is a matter of personal opinion. Jeff -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:[EMAIL PROTECTED] On Behalf Of Jed Barton Sent: Thursday, February 15, 2007 12:14 PM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] Antennas that work both in commercial and amateur Hey guys, I need some suggestions. I need a vhf and a uhf antena. Here's the requirement. I'm planning to operate both amateur and commercial stuff from the house. I'd rather not use a ham antenna in the commercial bands. Are there some that'll do the 136 to 174 split, and some UHF that'll do like 439 to 490? Any ideas? Thanks, Jed
Re: [Repeater-Builder] Solar Power Charge Controller Report
I have always steered away from Xantrex controllers, primarily because of the pathetic temperature specification: 32F to 104F. I have a remote cabin in Ontario, Canada that has to survive on its own during the winter with temperatures well outside that range. I suspect many remote mountaintops would be outside this range as well. I have never understood why a Canadian company would design such a beastgo figure... 73, John WØDP Ames, Iowa - Original Message - From: skipp025 To: Repeater-Builder@yahoogroups.com Sent: Thursday, February 15, 2007 2:33 PM Subject: [Repeater-Builder] Solar Power Charge Controller Report Re: Solar Power Charge Controller Report I just put in another solar power system using a Trace Xantrex C-60 aka C60 Controller. My first time using this (specific) newer generation Trace controller model, which appears to have an onboard pic processor. When compared to earlier C35 and C40 controllers the mechanical relay also goes away for 100% electronic switching/control. Lots to say about the C60... most of the current model features being well received. Of interest is the ability to configure the controller as a charge controller or a load diverter (but not at the same time). The only major downside is no true load LVD in the charge controller mode. ... but few small or moderate capacity quality solar charge controllers seem to include load LVD. But it's not a problem if you simply include a Load LVD such as the Newmar LVD units previously mentioned here in the group. Construction quality is pretty good and the manual is pretty darn good. Sad to see the unit now being made in China but that's the way of the world global economy. I needed the 60 amp capacity... otherwise I would probably spec the C40 controller for the higher input voltage range. The C60 input range is very good but the C40 input range is very impressive. System install and startup went without a hitch so onward we go... cheers, skipp
[Repeater-Builder] Re: Solar Power Charge Controller Report
Hi John, You might check on the newer generation of C series charge controllers. The spec on the new C60 is pretty good and I'll have a new C40 next week to beat up on. Construction is pretty good for what it is. I can't see any reason why it won't perform well past the mfgrs rated spec. The obvious answer to your question would be the controller rated to your required temp range would probably cost a lot more money. For the generic consumer market... this C60 is pretty good. I've used other charge controller brands... all with great luck. Even some of the homebrew and kit controllers are pretty good for what they are. cheers, skipp John WØDP [EMAIL PROTECTED] wrote: I have always steered away from Xantrex controllers, primarily because of the pathetic temperature specification: 32F to 104F. I have a remote cabin in Ontario, Canada that has to survive on its own during the winter with temperatures well outside that range. I suspect many remote mountaintops would be outside this range as well. I have never understood why a Canadian company would design such a beastgo figure... 73, John WØDP Ames, Iowa - Original Message - From: skipp025 To: Repeater-Builder@yahoogroups.com Sent: Thursday, February 15, 2007 2:33 PM Subject: [Repeater-Builder] Solar Power Charge Controller Report Re: Solar Power Charge Controller Report I just put in another solar power system using a Trace Xantrex C-60 aka C60 Controller. My first time using this (specific) newer generation Trace controller model, which appears to have an onboard pic processor. When compared to earlier C35 and C40 controllers the mechanical relay also goes away for 100% electronic switching/control. Lots to say about the C60... most of the current model features being well received. Of interest is the ability to configure the controller as a charge controller or a load diverter (but not at the same time). The only major downside is no true load LVD in the charge controller mode. ... but few small or moderate capacity quality solar charge controllers seem to include load LVD. But it's not a problem if you simply include a Load LVD such as the Newmar LVD units previously mentioned here in the group. Construction quality is pretty good and the manual is pretty darn good. Sad to see the unit now being made in China but that's the way of the world global economy. I needed the 60 amp capacity... otherwise I would probably spec the C40 controller for the higher input voltage range. The C60 input range is very good but the C40 input range is very impressive. System install and startup went without a hitch so onward we go... cheers, skipp
[Repeater-Builder] NEEDED: Kenwood KCT-23A-K2 Power cable
Anyone have one they are willing to part with? Thanks, Mike
[Repeater-Builder] Statistics
Recently I did some research on the membership statistics for this group. Here's some interesting info: We have 3,393 members. 556 are in Daily Digest mode. 883 are in Individual Emails mode 275 are in Special Notices mode - i.e. they read the mail via the YahooGroups web site, and if the owner or moderators send out a special notice they will get it in their normal email (note that this feature is almost never used here, in fact I can't remember the last time it was used). 1,679 are on No Email - i.e. they read the mail via the YahooGroups web site and they have locked themselves out of special notices. That last tidbit is very surprising to me. I would have thought that maybe 1/10 that many would go to the hassle of reading the mail through a web browser. 1694 are in Fully Featured mode, the rest are either in Default or Traditional mode. The Default mode ones haven't made a choice yet. Yahoo may make one for them at some point. The above is from a quick look at the Excel spreadsheet. I'm not a guru in Excel number crunching, and I didn't have a reason to go poking around any further. Mike WA6ILQ
Re: [Repeater-Builder] Antennas that work both in commercial and amateur
I would have to suggest any copper that has a huge bandwidth will have gain on only one tuned area , if you do want to span such areas a broadband dummy load like a Discone might be of use or tuned sticks for each frequency would be achievable and certainly would be of value in both tx and rrx From: Joe Montierth [EMAIL PROTECTED] Reply-To: Repeater-Builder@yahoogroups.com To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] Antennas that work both in commercial and amateur Date: Thu, 15 Feb 2007 13:36:10 -0800 (PST) --- mch [EMAIL PROTECTED] wrote: If you find one, it would have to be pretty low gain (like Unity). Joe M. Jed Barton wrote: Hey guys, I need some suggestions. I need a vhf and a uhf antena. Here's the requirement. I'm planning to operate both amateur and commercial stuff from the house. I'd rather not use a ham antenna in the commercial bands. Are there some that'll do the 136 to 174 split, and some UHF that'll do like 439 to 490? Any ideas? Thanks, Jed Yahoo! Groups Links Telewave ANT150D6-9 covers 138 to 174 MHz with 6 to 9 dB of gain. Telewave ANT450D7-12 covers 406-512 with 7 to 12 dB of gain. Joe Now that's room service! Choose from over 150,000 hotels in 45,000 destinations on Yahoo! Travel to find your fit. http://farechase.yahoo.com/promo-generic-14795097 _ Advertisement: Fresh jobs daily. Stop waiting for the newspaper. Search Now! www.seek.com.au http://a.ninemsn.com.au/b.aspx?URL=http%3A%2F%2Fninemsn%2Eseek%2Ecom%2Eau_t=757263760_r=Hotmail_EndText_Dec06_m=EXT
[Repeater-Builder] Re: Antennas that work both in commercial and amateur
--- In Repeater-Builder@yahoogroups.com, Barry C' [EMAIL PROTECTED] wrote: I would have to suggest any copper that has a huge bandwidth will have gain on only one tuned area , Well, actually no. Resonance is not a requirement for an effective antenna with broadband gain. The only requirement is that the RF be brought to and from the antenna by an effective matching system. Laryn K8TVZ
RE: [Repeater-Builder] Re: Antennas that work both in commercial and amateur
Well lets look at the riddle , swinging a radiator acree 20 or 30 megs of bandwidth it will tune and still radiate but will it have appreciable gain away from certain design points? I think not . From: Laryn Lohman [EMAIL PROTECTED] Reply-To: Repeater-Builder@yahoogroups.com To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] Re: Antennas that work both in commercial and amateur Date: Fri, 16 Feb 2007 03:10:59 - --- In Repeater-Builder@yahoogroups.com, Barry C' [EMAIL PROTECTED] wrote: I would have to suggest any copper that has a huge bandwidth will have gain on only one tuned area , Well, actually no. Resonance is not a requirement for an effective antenna with broadband gain. The only requirement is that the RF be brought to and from the antenna by an effective matching system. Laryn K8TVZ where did I mention resonance ? resonance of course being point normally considered highest gain so matching 30 ft of wire and 1.85 megs wont work terribly well will it ? _ Advertisement: Amazing holiday rentals? http://a.ninemsn.com.au/b.aspx?URL=http%3A%2F%2Fwww%2Eninemsn%2Erealestate%2Ecom%2Eau%2Fcgi%2Dbin%2Frsearch%3Fa%3Dbhp%26t%3Dhol%26cu%3DMSN_t=758874163_r=HM_Txt_Link_Holiday_Oct06_m=EXT
[Repeater-Builder] Re: Antennas that work both in commercial and amateur
--- In Repeater-Builder@yahoogroups.com, Barry C' [EMAIL PROTECTED] wrote: Well lets look at the riddle , swinging a radiator acree 20 or 30 megs of bandwidth it will tune and still radiate but will it have appreciable gain away from certain design points? I think not . OK, within certain unspecified parameters, I would agree. Let's be more specific. I referred to the ASPB602 in an earlier post, which has 6 or 9 dbd gain, depending on dipole configuration around the mast (normal for four stacked dipoles), and bandwidth of 144-162 mc (wider than most antennas in this range). Just trying to understand Barry, do you agree that these specs are valid? Depending on your answer, we can discuss further... Laryn K8TVZ
RE: [Repeater-Builder] Statistics
I prefer the traditional mode of receiving e-mails from my various Yahoo Groups. All that extra garbage they add on does nothing for me, other than grate on my nerves... ;-) I just wish there was a way to KEEP my settings after an e-mail address bounce occurs. Seems that I get them every so often, and with having subscriptions to over 40 groups, it's a real PITA to go in and reset each one after un-bouncing my address. Mark - N9WYS -Original Message- From: Repeater-Builder@yahoogroups.com On Behalf Of Mike Morris WA6ILQ Recently I did some research on the membership statistics for this group. Here's some interesting info: We have 3,393 members. 556 are in Daily Digest mode. 883 are in Individual Emails mode 275 are in Special Notices mode - i.e. they read the mail via the YahooGroups web site, and if the owner or moderators send out a special notice they will get it in their normal email (note that this feature is almost never used here, in fact I can't remember the last time it was used). 1,679 are on No Email - i.e. they read the mail via the YahooGroups web site and they have locked themselves out of special notices. That last tidbit is very surprising to me. I would have thought that maybe 1/10 that many would go to the hassle of reading the mail through a web browser. 1694 are in Fully Featured mode, the rest are either in Default or Traditional mode. The Default mode ones haven't made a choice yet. Yahoo may make one for them at some point. The above is from a quick look at the Excel spreadsheet. I'm not a guru in Excel number crunching, and I didn't have a reason to go poking around any further. Mike WA6ILQ
RE: [Repeater-Builder] Re: Antennas that work both in commercial and amateur
--- Barry C' [EMAIL PROTECTED] wrote: From: Laryn Lohman [EMAIL PROTECTED] Reply-To: Repeater-Builder@yahoogroups.com To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] Re: Antennas that work both in commercial and amateur Date: Fri, 16 Feb 2007 05:04:02 - --- In Repeater-Builder@yahoogroups.com, Barry C' [EMAIL PROTECTED] wrote: Well lets look at the riddle , swinging a radiator acree 20 or 30 megs of bandwidth it will tune and still radiate but will it have appreciable gain away from certain design points? I think not . OK, within certain unspecified parameters, I would agree. Let's be more specific. I referred to the ASPB602 in an earlier post, which has 6 or 9 dbd gain, depending on dipole configuration around the mast (normal for four stacked dipoles), and bandwidth of 144-162 mc (wider than most antennas in this range). Just trying to understand Barry, do you agree that these specs are valid? Depending on your answer, we can discuss further... I presume its some sort of stacked arrangment , in chich case it will make that gain at resonance , claims are like water (sic) Laryn K8TVZ We have a couple of the Telewave broadband antennas, and they do seem to exhibit the gain over the advertised bandwidth. They are rated at 138-174, and do have good SWR over that range, and good gain. They replaced DB224 antennas at the same locations on the tower, and give exactly the same coverage. We have radios at 145, 153, and 168MHz on one antenna, and all radios perform the same, no difference in gain was noted. There may be some skewing of the vertical radiation angle at the different frequencies, but we haven't noticed that either. Telewave only makes one model of antenna to cover the whole VHF range. The same antenna is sold to those who use it at 170 as those who use it at 140, and no gain changes are noted in the literature. I'm sure there are differences in the gain, but they are miniscule, certainly nothing major. There are lots of antennas that have gain and wide bandwidth, the two are not mutually exclusive. A Stationmaster and SuperStationmaster look similar, and have similar gain, but the SSM will have 8MHz of bandwidth on VHF compared to less than 2 for the SM. Joe Need a quick answer? Get one in minutes from people who know. Ask your question on www.Answers.yahoo.com
RE: [Repeater-Builder] Antenna cleaning solvent ???
You might try ZoopSeal. this product is used on aluminum wheels, valve covers, manifolds, etc., to keep them from pitting, tarnishing, etc. It does make the item fairly water-resistant after application. (I've only seen it demonstrated on TV and the demo was NOT an infomercial.) It is available from Jegs (auto supply) at: http://www.jegs.com/webapp/wcs/stores/servlet/product2_10001_10002_752641_-1 Here's the company's web site: http://www.zoopseal.com/zoopseal.asp Just make sure you have the parts that NEED to have electrical contact firmly installed in place before you use this product. It is a liquid, and MAY seep between items. I do not know whether this product could cause the parts to become insulated from each other. might want to contact the manufacturer before with questions. 73! Mark - N9WYS _ From: Repeater-Builder@yahoogroups.com On Behalf Of Captainlance Auto part stores carry Aluminum wheel cleaner, it is a strong chemical that strips off oxidation and leaves a clean , raw, surface. The only problem is that raw aluminum starts to oxidize immediately. You will need to covert the antenna with a coating of clear urethane to stop this from happening . This can be done with spray or brush. Lance N2HBA - Original Message - From: John mailto:[EMAIL PROTECTED] What is a good cleaning solvent for aluminum repeater antennas? I have an antenna that was exposed to the weather for years and it has become pitted and dirty from the enviroment. Thanks, John
RE: [Repeater-Builder] Re: 2M Power Amp
FWIW - I have a Crescend UHF PA in operation on my 444.550 machine with absolutely NO complaints. Mark - N9WYS -Original Message- From: Repeater-Builder@yahoogroups.com On Behalf Of Jim B. Maire-Radios wrote: Well I think there are 8 or 9 Vocom/Cresend amps I have in service all UHF. 1 Henry UHF, 1 TE systems UHF, 6 or so TPL 5 UHF and one VHF 2 meter high end grade amp. I have had one Vocom go back for repair and testing but no trouble found so no cost. had 2 or so TPL go in for repair and cost about $250 each time. That is the best I can come up with very little service on them. Thanks John PLEASE make sure you differentiate between Vocom and Crescend. M/A-Com is using *Crescend* PA's on Mastr III's. They are *NOT* repeat *NOT* Vocom amps! They may have bought Vocom, but not all Crescend amps are Vocom! -- Jim Barbour WD8CHL
