[Repeater-Builder] Decibel dipole array sweeps

2009-03-22 Thread Jeff DePolo
I'm in the process of putting up a remote receiver for a 440 ham repeater using a Decibel DB413 dipole array cut for 450-470 MHz. Since Decibel/Andrew stopped making the 440-450 MHz custom models, I've used the usual 450-470 split antennas for receive sites, and they've performed well. I swept

Re: [Repeater-Builder] Re: 2 GM300 UHF Mobile Radios for Repeater

2009-03-22 Thread Azam
hi, we have been using surplus GM300 Radios as repeater about one year and have no problem with it.. very good radios. Either using back to back interface from ebay or HLNB controller both work great. We are planning to link our repeaters and need help for interfacing it. I appreciate if

Re: [Repeater-Builder] Decibel dipole array sweeps

2009-03-22 Thread no6b
At 3/22/2009 11:32, you wrote: The document can be found here: http://www.broadsci.com/Antenna Sweeps r1.pdf I get a The file is damaged could not be repaired error. Bob NO6B

RE: [Repeater-Builder] SCR-200(A)

2009-03-22 Thread Morris Dillingham
Perhaps the last update on the SCT1000/SCR200 rebuild: We took the duplexer that we had been using for testing back to the guy who tuned it. It turns out that it was tuned for another repeater frequency so we were ok with the setup of the repeater itself. Thanks to Larry and Joe specifically

[Repeater-Builder] Master II station 66 split conversion to 56 split

2009-03-22 Thread Morris Dillingham
Now that you have helped me close out the old Spectrum issues, can anyone point me to the list of caps and their new values to convert the exciter board of a Master II station? On the NHRC site I see mention of the need to change out a dozen or so caps but no other references. 73 de Morris

Re: [Repeater-Builder] Decibel dipole array sweeps

2009-03-22 Thread Paul N1BUG
n...@no6b.com wrote: At 3/22/2009 11:32, you wrote: The document can be found here: http://www.broadsci.com/Antenna Sweeps r1.pdf I get a The file is damaged could not be repaired error. And I get a 404 Page not found error. Paul

Re: [Repeater-Builder] Decibel dipole array sweeps

2009-03-22 Thread Doug Bade
The link is broken if you try to use it as it came through.. the space in the file name is the killer... http://www.broadsci.com/Antenna%20Sweeps%20r1.pdf is the correct link Doug At 03:31 PM 3/22/2009, you wrote: mailto:no6b%40no6b.comn...@no6b.com wrote: At 3/22/2009 11:32, you wrote:

[Repeater-Builder] RE: AF2140 filter

2009-03-22 Thread Doug
I have come across this filter in my junk box and am unable to find much information on it. I think it is a Sinclair unit, but does not appear to be listed in the Sinclair Catalog. I am sure it is a vhf unit but am not sure of the tuning procedures. It follows a Isolator. Is it a LP filter or a

[Repeater-Builder] Re: Decibel dipole array sweeps

2009-03-22 Thread n3dab
No luck accessing the website. Have you tested the DB420. I know they are pretty broad banded. I have a damaged one and only the top half is useable. What type of impedence mismatch am I looking at if I feed the top half at the mid point connector. And it if is way off, how would I correct

RE: [Repeater-Builder] Decibel dipole array sweeps

2009-03-22 Thread Jeff DePolo
Boy, Yahoo really mangled the URL, even though I put it in angle brackets. Let's try re-naming the file without spaces, maybe that will work... http://www.broadsci.com/AntennaSweepsR1.pdf Bob - the file opened fine for me, both locally and from the web site. I'm using Acrobat 9.0. The

Re: [Repeater-Builder] Decibel dipole array sweeps

2009-03-22 Thread Doug Bade
Jeff; This is very interesting findings especially in that using an antenna longer than your freq tends to exhibit down tilt... that 440 use of a 450 antenna seems to be working in the correct direction. I for one found it very interesting to read It may be real interesting to see

[Repeater-Builder] Re: Decibel dipole array sweeps

2009-03-22 Thread n3dab
Jeff , I'm interested, however, I can't pull up the website you posted below for some reason. Also I'm curious about your findings with regard to using the upper half of atennas like the DB420 and impedance you are seeing at the mid point connector. I'm assuming the entire antenna presents

Re: [Repeater-Builder] Re: Decibel dipole array sweeps

2009-03-22 Thread Chuck Kelsey
It should work fine. It is at 50-ohms there. Chuck WB2EDV - Original Message - From: n3dab rb_n3...@tds.net To: Repeater-Builder@yahoogroups.com Sent: Sunday, March 22, 2009 3:46 PM Subject: [Repeater-Builder] Re: Decibel dipole array sweeps No luck accessing the website. Have

Re: [Repeater-Builder] Decibel dipole array sweeps

2009-03-22 Thread Chuck Kelsey
Page cannot be found using your fixed link. Chuck WB2EDV - Original Message - From: Doug Bade k...@thebades.net To: Repeater-Builder@yahoogroups.com Sent: Sunday, March 22, 2009 3:54 PM Subject: Re: [Repeater-Builder] Decibel dipole array sweeps The link is broken due to the space

RE: [Repeater-Builder] RE: AF2140 filter

2009-03-22 Thread Jeff DePolo
I'm almost positive that it's a Celwave, not a Sinclair, but I don't recognize that exact part number. Their tunable low-pass filters (actually second harmonic notch filters) had part numbers like AF150-T which was for highband VHF (the 150 being the nominal center of the passbasnd frequency,

Re: [Repeater-Builder] Decibel dipole array sweeps

2009-03-22 Thread Joe
That's strange. I'm using Foxfire 3.0.7 and the original link was OK. Joe Doug Bade wrote: The link is broken if you try to use it as it came through.. the space in the file name is the killer... http://www.broadsci.com/Antenna%20Sweeps%20r1.pdf

RE: [Repeater-Builder] Decibel dipole array sweeps

2009-03-22 Thread Jeff DePolo
For a parallel-fed (aka binary-fed, corporate-fed, etc.) antenna, if all of the elements are fed in-phase (i.e. the branches in the phasing harness are all the same length), as it typical with most dipole arrays, there won't be any uptilt/downtilt as you vary the transmitter frequency outside of

RE: [Repeater-Builder] Decibel dipole array sweeps

2009-03-22 Thread Eric Lemmon
I got the same result. The link was parsed incorrectly. Try this: www.broadsci.com/Antennasweepsr1.pdf 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of n...@no6b.com Sent: Sunday, March 22, 2009

RE: [Repeater-Builder] Re: 2 GM300 UHF Mobile Radios for Repeater

2009-03-22 Thread Peter Dakota Summerhawk
I use a few M-10 with a controller on ebay from MRE and it works just fine. Peter Summerhawk -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of Azam Sent: Sunday, March 22, 2009 9:53 AM To: Repeater-Builder@yahoogroups.com

Re: [Repeater-Builder] Decibel dipole array sweeps

2009-03-22 Thread Doug Bade
Joe; The original posted file name had spaces in between Antenna, Sweeps, and r1 ...and some or all windows client email programs likley displayed as he sent it... Mine did but I spotted it as it showed as fractured hyperlink... Foxfire my have corrected it in your case. When I

RE: [Repeater-Builder] Decibel dipole array sweeps

2009-03-22 Thread Doug Bade
Jeff; What is your thoughts on the radiation launch angle in this case if beam tilt does not suffer/gain ??? I have a case in point of a wideband 406-470 uhf sinclair dipole 310C4.. on VHF as the elements are larger than vhf needs ??? in other words using it on both vhf and uhf

Re: [Repeater-Builder] Decibel dipole array sweeps

2009-03-22 Thread Doug Bade
The link is broken due to the space in the name... The actual url is http://www.broadsci.com/Antenna%20Sweeps%20r1.pdf Doug this may be a dup.. my outbound mail seems to be randomly getting delayed.. At 03:31 PM 3/22/2009, you wrote: mailto:no6b%40no6b.comn...@no6b.com wrote: At

RE: [Repeater-Builder] RE: AF2140 filter

2009-03-22 Thread Eric Lemmon
Doug, The Sinclair AF-2140 is a VHF harmonic filter that is intended to follow a ferrite isolator. According to my Sinclair catalog, it comes in two versions: 132-150 MHz, and 150-174 MHz. It has a 0.1 dB insertion loss and can attenuate the second harmonic a minimum of 40 dB. It can be tuned

RE: [Repeater-Builder] Decibel dipole array sweeps

2009-03-22 Thread Jeff DePolo
As I mentioned a few minutes ago, there won't be any change in the take-off angle (beamtilt) for these parallel-fed dipole arrays. However, as you go lower in frequency, as we typically do when using a 450-470 antenna down in the 440's, the elements are effectively spaced closer together (in

Re: [Repeater-Builder] Decibel dipole array sweeps

2009-03-22 Thread Chuck Kelsey
Jeff is correct. A corporate fed antenna will only start to loose a bit of gain when you go outside of the band. Obviously you go too far and the return loss goes sour. Chuck WB2EDV - Original Message - From: Jeff DePolo j...@broadsci.com To: Repeater-Builder@yahoogroups.com Sent:

Re: [Repeater-Builder] Decibel dipole array sweeps

2009-03-22 Thread Chuck Kelsey
The group hereby accepts Joe's offer to construct an antenna test range to conduct pattern testing. What a nice guy! LOL!! Chuck WB2EDV - Original Message - From: Joe k1ike_m...@snet.net To: Repeater-Builder@yahoogroups.com Sent: Sunday, March 22, 2009 4:22 PM Subject: Re:

Re: [Repeater-Builder] Decibel dipole array sweeps

2009-03-22 Thread Chuck Kelsey
Jeff - When you are testing next time, it might be interesting to see results of a sweep using some feedline attached to the antenna. I have to wonder what impact it may (or may not) have. When you test with your instrument connected to the pigtail, are you standing right there, or is the

RE: [Repeater-Builder] Decibel dipole array sweeps

2009-03-22 Thread Gary
An interesting project, I look forward to reading your report however your link was incorrectly typed. Here is a corrected link; http://www.broadsci.com/AntennaSweepsr1.pdf Gary -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On

RE: [Repeater-Builder] Decibel dipole array sweeps

2009-03-22 Thread Jeff DePolo
The link in Doug's email below still has spaces in it (%20 hex ASCII for space character). Use the revised name I sent out that doesn't have spaces in it: http://www.broadsci.com/AntennaSweepsR1.pdf --- Jeff -Original Message- From:

RE: [Repeater-Builder] Decibel dipole array sweeps

2009-03-22 Thread Jeff DePolo
It wouldn't suprise me if the VSWR wasn't terrible since you'd be operating the antenna at an odd multiple of its original design frequency. However, the elevation pattern will likely be a mess. In other words, it may look just dandy on the Sitemaster, but under-perform by a whole lot out in

[Repeater-Builder] Re: Decibel dipole array sweeps

2009-03-22 Thread Tom, N6MVT
On a somewhat related notes...I had to do some research on the rare (and not currently made) down tilt models from db products. I have some paperwork with measurements and notes on them from their archives. Not complete or easy to read (originally faxed) but it helps to determine if you might

RE: [Repeater-Builder] Decibel dipole array sweeps

2009-03-22 Thread Jeff DePolo
In general, the loss in the feedline will only make the return loss look better. If you have an antenna with a 14 dB return loss at the frequency of interest at the feedpoint, and connect it to a feedline that has 2 dB of loss, the return loss will be 14dB + 2 x 2dB = 18 dB looking into the

Re: [Repeater-Builder] Master II station 66 split conversion to 56 split

2009-03-22 Thread Jim Brown
I have retuned 10+ GE Mastr II exciters - base/moble and have never had to change a component.  Put the ICOM in for the new frequency and tune per the manual. I use a Bird milliWatt meter that has a 250 mW full scale and an internal 50 Ohm load to finish the tuning, after going through the

Re: [Repeater-Builder] Re: Decibel dipole array sweeps

2009-03-22 Thread Jim Brown
I have done the mod mentioned on several DB-224 antennas by taking some six inch lengths of an old TV antenna and flattening about three inches on one end and wrapping the flattened end around the end of the dipole and putting a machine screw through the flats to hold the extension to the

RE: [Repeater-Builder] Decibel dipole array sweeps

2009-03-22 Thread Mark
Using the link Eric posted below, I got the same error message that Bob NO6B got - file damaged and could not be repaired... Mark - N9WYS -Original Message- From: Repeater-Builder@yahoogroups.com On Behalf Of Eric Lemmon I got the same result. The link was parsed incorrectly. Try

RE: [Repeater-Builder] Re: Decibel dipole array sweeps

2009-03-22 Thread Jeff DePolo
I'd be interested in seeing what you have. Back in the old days of Decibel, they would send you good info if you were able to get to the right person. I haven't had that kind of success since Andrew bought them out. Just this week I came across a non-catalog Decibel antenna on a tower (the one

[Repeater-Builder] off topic

2009-03-22 Thread Mike DeWaele
Any one know what or how a kenwood tk-710 is programmed? I have cables for kenwoods but can't find any software. Thisis an older radio maybe it is still got crystals? Google is not my friend this time! Thanks, Mike Ka2NDW

RE: [Repeater-Builder] Decibel dipole array sweeps

2009-03-22 Thread Eric Lemmon
Mark, It may be a browser issue. I clicked on the link below, and the correct page opened. It works fine with XP Pro and IE7. Go figure... 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of Mark

RE: [Repeater-Builder] Re: Decibel dipole array sweeps

2009-03-22 Thread Jeff DePolo
Re-reading your message about downtilt antennas brought back a distant memory. I was putting up a new 440 ham repeater, and grabbed a used DB408 out of the stash, checked the tag, and it said 450-470 MHz. A quick sweep on the Sitemaster looked fine, so off I went. A few hours later I get to

RE: [Repeater-Builder] Decibel dipole array sweeps

2009-03-22 Thread no6b
At 3/22/2009 13:01, you wrote: Boy, Yahoo really mangled the URL, even though I put it in angle brackets. Let's try re-naming the file without spaces, maybe that will work... http://www.broadsci.com/AntennaSweepsR1.pdf Bob - the file opened fine for me, both locally and from the web site. I'm

Re: [Repeater-Builder] Re: Decibel dipole array sweeps

2009-03-22 Thread Chuck Kelsey
A better method might be to actually cut each half of the element at about the mid-point (not at the bend - at the straight section), then slide some smaller tubing inside. Slide the element ends in and out while testing and then use some stainless screws to attach things back together at your

RE: [Repeater-Builder] Decibel dipole array sweeps

2009-03-22 Thread Kris Kirby
On Sun, 22 Mar 2009 n...@no6b.com wrote: Well, without a long explanation, I can't view files made for Acrobat 6 later. No way around it unless I want to lose PDF authoring capability. Buy a Mac and image the Windows box and use it in a virtual machine. Then you can author in PDFs and the

Re: [Repeater-Builder] Decibel dipole array sweeps

2009-03-22 Thread Chuck Kelsey
OK, that makes sense. It would still be interesting to see if the loss theory holds true using a known quantity of feedline. Chuck WB2EDV - Original Message - From: Jeff DePolo j...@broadsci.com To: Repeater-Builder@yahoogroups.com Sent: Sunday, March 22, 2009 5:29 PM Subject: RE:

Re: [Repeater-Builder] Master II station 66 split conversion to 56 split

2009-03-22 Thread no6b
At 3/22/2009 15:03, you wrote: I have retuned 10+ GE Mastr II exciters - base/moble and have never had to change a component. Put the ICOM in for the new frequency and tune per the manual. Same experience here, except that if you want to put one on the 144.390 APRS frequency you may find that

Re: [Repeater-Builder] Re: Decibel dipole array sweeps

2009-03-22 Thread Kris Kirby
On Sun, 22 Mar 2009, Chuck Kelsey wrote: A better method might be to actually cut each half of the element at about the mid-point (not at the bend - at the straight section), then slide some smaller tubing inside. Slide the element ends in and out while testing and then use some stainless

RE: [Repeater-Builder] Decibel dipole array sweeps

2009-03-22 Thread Kris Kirby
On Sun, 22 Mar 2009, Jeff DePolo wrote: the elements are fed in-phase (i.e. the branches in the phasing harness are all the same length), as it typical with most dipole arrays, there won't be any uptilt/downtilt as you vary the transmitter frequency outside of the design range a bit. No

Re: [Repeater-Builder] Decibel dipole array sweeps

2009-03-22 Thread Nate Duehr
On Mar 22, 2009, at 3:29 PM, Jeff DePolo wrote: In general, the loss in the feedline will only make the return loss look better. This leads to situations on poorly built systems where an antenna has gone bad but the feedline is such poor quality, that the transmitter is still quite

Re: [Repeater-Builder] Re: Decibel dipole array sweeps

2009-03-22 Thread Nate Duehr
On Mar 22, 2009, at 4:13 PM, Jim Brown wrote: I have done the mod mentioned on several DB-224 antennas by taking some six inch lengths of an old TV antenna and flattening about three inches on one end and wrapping the flattened end around the end of the dipole and putting a machine

Re: [Repeater-Builder] Master II station 66 split conversion to 56 split

2009-03-22 Thread Kris Kirby
On Sun, 22 Mar 2009 n...@no6b.com wrote: I have retuned 10+ GE Mastr II exciters - base/moble and have never had to change a component. Put the ICOM in for the new frequency and tune per the manual. Same experience here, except that if you want to put one on the 144.390 APRS frequency

[Repeater-Builder] Re: Decibel dipole array sweeps

2009-03-22 Thread rahwayflynn
--- In Repeater-Builder@yahoogroups.com, Kris Kirby k...@... wrote: The results, I would say in practical terms, is that a DB-224 cut for 165MHz isn't a bad thing. You'll experience some uptilt. But matching the antenna to a 50-ohm transmitter is another issue altogether. So the question is,

[Repeater-Builder] OT: Making PDFs

2009-03-22 Thread Dave Gomberg
At 15:37 3/22/2009, Kris Kirby wrote: No way around it unless I want to lose PDF authoring capability. Buy a Mac Actually WordPerfect makes beautiful PDF files and has for years... -- Dave Gomberg, San Francisco NE5EE gomberg1 at wcf dot com All addresses, phones, etc. at

Re: [Repeater-Builder] Decibel dipole array sweeps

2009-03-22 Thread Nate Duehr
On Mar 22, 2009, at 12:32 PM, Jeff DePolo wrote: The antennas I tested in this first batch are: DB413, 450-470 MHz DB408D, 450-470 MHz DB411, 450-470 MHz DB411, 406-420 MHz By the way, I like it, Jeff! Got any Sinclairs handy for a comparison between common brands? -- Nate Duehr, WY0X

RE: [Repeater-Builder] Decibel dipole array sweeps

2009-03-22 Thread no6b
At 3/22/2009 15:37, you wrote: On Sun, 22 Mar 2009 n...@no6b.com wrote: Well, without a long explanation, I can't view files made for Acrobat 6 later. No way around it unless I want to lose PDF authoring capability. Buy a Mac Of all the possible solutions, that is probably the most

Re: [Repeater-Builder] Master II station 66 split conversion to 56 split

2009-03-22 Thread Nate Duehr
On Mar 22, 2009, at 4:40 PM, Kris Kirby wrote: On Sun, 22 Mar 2009 n...@no6b.com wrote: I have retuned 10+ GE Mastr II exciters - base/moble and have never had to change a component. Put the ICOM in for the new frequency and tune per the manual. Same experience here, except that if you

RE: [Repeater-Builder] Decibel dipole array sweeps

2009-03-22 Thread Jeff DePolo
I'm modeling a half-wave dipole with the bottom .25 wavelength (at 145MHz) above zero, with five meters added from the bottom. This antenna, five plus meters above ground, shows that when transmitting at 165MHz, the highest point of gain is a lower degree of elevation than when

Re: [Repeater-Builder] Re: Decibel dipole array sweeps

2009-03-22 Thread Kris Kirby
On Sun, 22 Mar 2009, rahwayflynn wrote: I have access to 316 stainless tube am willing to take a shot at fabricating replacement elements. Sounds like fun. I think the DB antennas are made from aluminum, however. If you're going to be making a DB antenna clone, it makes more sense to

RE: [Repeater-Builder] Decibel dipole array sweeps

2009-03-22 Thread Jeff DePolo
I have a Sinclair 8-bay with half-wave element to mast spacing stored in the Sitemaster, but it was swept from the far end of 600' of 1-5/8 with a topside TX-RX crossband coupler. It's spec'ed for 406-512 MHz. I can't keep track of Sinclair's model numbers, it's probably a SD318-HF2P2SNM,

Re: [Repeater-Builder] Re: Decibel dipole array sweeps

2009-03-22 Thread Chuck Kelsey
I don't have any parameters. I was just suggesting this method (lengthening the entire element) as opposed to adding stubs to the ends of the elements. Yes, the elements will be closer to each other either way, but that may be a constraint of the phasing harness. If there was some slack, the

Re: [Repeater-Builder] Decibel dipole array sweeps

2009-03-22 Thread Joe
Actually, years ago I did some really crude antenna test range tests on an antenna. I brought it up on the roof on a 10 foot mast and monitored a repeater. Then I tilted the pole back and forth towards the repeater to see if I could find the major lobe while watching the S meter on my HT.

Re: [Repeater-Builder] Decibel dipole array sweeps

2009-03-22 Thread Chuck Kelsey
Why not just include it with your article already posted? Just add the notes along with it. Chuck WB2EDV - Original Message - From: Jeff DePolo j...@broadsci.com To: Repeater-Builder@yahoogroups.com Sent: Sunday, March 22, 2009 7:11 PM Subject: RE: [Repeater-Builder] Decibel dipole

Re: [Repeater-Builder] Decibel dipole array sweeps

2009-03-22 Thread Joe
I've had arguments with tower crews about antennas that are too good when doing a system sweep. They would proudly state that the install was really good because the Return Loss was 28 dB on a wide band 800Mhz antenna that was only suppose to be about 14-18dB RL at the antenna. Turned out to

RE: [Repeater-Builder] Decibel dipole array sweeps

2009-03-22 Thread Mark
I got to the page, but the file wouldn't open... Mark - N9WYS -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of Eric Lemmon Sent: Sunday, March 22, 2009 5:25 PM To: Repeater-Builder@yahoogroups.com Subject: RE:

[Repeater-Builder] Re: Decibel dipole array sweeps

2009-03-22 Thread rahwayflynn
--- In Repeater-Builder@yahoogroups.com, Kris Kirby k...@... wrote: On Sun, 22 Mar 2009, rahwayflynn wrote: I have access to 316 stainless tube am willing to take a shot at fabricating replacement elements. Sounds like fun. I think the DB antennas are made from aluminum, however.

[Repeater-Builder] moducom manual.

2009-03-22 Thread kc7stw
Looking for a manual for a Moducom ultra-page 96 pager encoder. Does any one have one? I contacted Moducom, no luck. They seem to be like Zetron. Thanks -Jason

RE: [Repeater-Builder] Decibel dipole array sweeps

2009-03-22 Thread Kris Kirby
On Sun, 22 Mar 2009, Jeff DePolo wrote: Wait. You're saying that a center-fed dipole has a major lobe that's not exactly perpendicular to the element? Something's amiss. It's a theoretical antenna over a real ground. In free space, the lobes are closer to zero, but even over a perfect

RE: [Repeater-Builder] Decibel dipole array sweeps

2009-03-22 Thread Gary
Bob, Paste the link into your location bar then remove the '%20' groups of characters from the link. The result should look like this- http://www.broadsci.com/AntennSweepsR1.pdf Gary N6LRV -Original Message- From: Repeater-Builder@yahoogroups.com

RE: [Repeater-Builder] Decibel dipole array sweeps

2009-03-22 Thread Jeff DePolo
I guess I could, but you'd also see the effect of the crossband coupler, jumpers, and everything else in-line. I figured I'd start afresh with all new antennas tested at ground level. -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com]

RE: [Repeater-Builder] Decibel dipole array sweeps

2009-03-22 Thread Kris Kirby
On Sun, 22 Mar 2009, Gary wrote: Bob, Paste the link into your location bar then remove the '%20' groups of characters from the link. The result should look like this- http://www.broadsci.com/AntennSweepsR1.pdf This works: http://www.broadsci.com/AntennaSweepsR1.pdf -- Kris Kirby, KE4AHR

RE: [Repeater-Builder] Decibel dipole array sweeps

2009-03-22 Thread Jeff DePolo
On Sun, 22 Mar 2009, Jeff DePolo wrote: Wait. You're saying that a center-fed dipole has a major lobe that's not exactly perpendicular to the element? Something's amiss. It's a theoretical antenna over a real ground. In free space, the lobes are closer to zero, but even over a

Re: [Repeater-Builder] Re: Decibel dipole array sweeps

2009-03-22 Thread NORM KNAPP
I tried adding length to the tubes on a DB-224A. I sacrificed some DB-420 elements to do it. They fit perfectly. Inside the DB-224A. This was quite a bit of work. The end results was not favorable. The SWR did not improve by adding lenght. In fact it got worse. I don't know why. I have not

RE: [Repeater-Builder] Decibel dipole array sweeps

2009-03-22 Thread Kris Kirby
On Sun, 22 Mar 2009, Jeff DePolo wrote: Free space doesn't have a ground. Can you disable ground altogether and see what the gain and pattern is? Yes. It looks like what you'd expect a perfect antenna to look like. What does it give you for the gain of a single half-wave dipole with no

Re: [Repeater-Builder] OT: Making PDFs

2009-03-22 Thread John J. Riddell
Dave, try down loading a small program called Cute PDF writer...it's free and will make PDF's for you. It is set up as a printer but saves them to a file on your computer. 73 John VE3AMZ - Original Message - From: Dave Gomberg da...@wcf.com To: Repeater-Builder@yahoogroups.com Sent:

RE: [Repeater-Builder] Decibel dipole array sweeps

2009-03-22 Thread no6b
At 3/22/2009 16:23, you wrote: Bob, Paste the link into your location bar then remove the '%20' groups of characters from the link. The result should look like this- Not the problem. Acrobat 5 is as far as my home system goes. Unfortunately the full version of Acrobat overrides any Reader

[Repeater-Builder] Re: Decibel dipole array sweeps

2009-03-22 Thread nj902
--- In Repeater-Builder@yahoogroups.com, Chuck Kelsey wb2...@... wrote: ... it might be interesting to see results of a sweep using some feedline attached to the antenna. I have to wonder what impact it may (or may not) have. ... ---

RE: [Repeater-Builder] Decibel dipole array sweeps

2009-03-22 Thread Jeff DePolo
Free space doesn't have a ground. Can you disable ground altogether and see what the gain and pattern is? Yes. It looks like what you'd expect a perfect antenna to look like. What does it give you for the gain of a single half-wave dipole with no ground or support structure?

RE: [Repeater-Builder] OT: Making PDFs

2009-03-22 Thread Chris Curtis
Or Microsoft office has a free plug-in that gives pdf export capability to office apps. Chris Kb0wlf 3185 Btw, my wife is a graphics designer for the local newspaper and has MAC stuff all over the place but I'm still die hard wintel -Original Message- From:

Re: [Repeater-Builder] Re: Decibel dipole array sweeps

2009-03-22 Thread Chuck Kelsey
First, I have never played with a DB224. However, I have changed the length of a DB-212 to get it on 6-meters and it worked fine. I have heard that people have improved VSWR on the DB-224 by adding bolts through the ends of the loops to lengthen them. If that did indeed work, I would assume

Re: [Repeater-Builder] OT: Making PDFs

2009-03-22 Thread Roger White
I also have used the freeware Cute PDF Writer for a number of years. We used it in the 1000's at work. Have it on my home computer now that I am retired. http://www.cutepdf.com/Products/CutePDF/writer.asp Roger W5RDW - Original Message - From: John J. Riddell To:

Re: [Repeater-Builder] Decibel dipole array sweeps

2009-03-22 Thread Kevin Custer
n...@no6b.com wrote: Not the problem. Acrobat 5 is as far as my home system goes. Unfortunately the full version of Acrobat overrides any Reader installation. Not Windows' fault, but Adobe's. I do have a 1 GHz PIII backup system I could put the new reader on if I was desperate, but not

RE: [Repeater-Builder] Decibel dipole array sweeps

2009-03-22 Thread Jeff DePolo
Bob. Always the trouble maker. Try this HTML version. It was produced by Microsoft Word which has the most god-awful HTML generator on the planet IMHO. I make no guarantees as to its readability. http://www.broadsci.com/AntennaSweepsR1.htm --- Jeff WN3A

RE: [Repeater-Builder] RE: AF2140 filter

2009-03-22 Thread Doug
Well since I don't have access to sweep gear, I will leave it and just use a BP filter on the transmit side after the isolator. Thanks for the help. Doug

RE: [Repeater-Builder] Decibel dipole array sweeps

2009-03-22 Thread no6b
At 3/22/2009 17:44, you wrote: Bob. Always the trouble maker. Try this HTML version. It was produced by Microsoft Word which has the most god-awful HTML generator on the planet IMHO. I make no guarantees as to its readability. http://www.broadsci.com/AntennaSweepsR1.htm

Re: [Repeater-Builder] Re: Decibel dipole array sweeps

2009-03-22 Thread NORM KNAPP
Cutting and extending the loops did not work in my case. The SWR went up. I am useing a DB-224A on 147.225/147.825. The swr on TX is around 2.0:1. Despite this little problem, the repeater has great coverage. - Original Message - From: Repeater-Builder@yahoogroups.com

Re: [Repeater-Builder] Re: Decibel dipole array sweeps

2009-03-22 Thread Jim Brown
I had a buddy who did physically lengthen the two ends of each dipole by cutting them and inserting aluminum tubing and welding the assembly back together.  His brother in law was good at aluminum welding.  Again, he did not change anything in the harness and the antennas work fine now in the

Re: [Repeater-Builder] Maratrac CTCSS injection point

2009-03-22 Thread Milt
Since the Maratrac radio is basically a Maxtrac with a larger PA, I would take a look at the 16 pin accessory connector on the exciter/receiver portion of the Maratrac radio and compare it to a Maxtrac. Without specific documentation I'm going from memory but there is a Maxtrac configuration

Re: [Repeater-Builder] Master II station 66 split conversion to 56 split

2009-03-22 Thread Jim Brown
Hey - I thought we were talking about the standard osc/multiplier exciters for VHF.  The only thing I have ever had to do to move a PLL exciter down into the ham band is replace the aluminum slug in the PLL coil with a ferrite slug.  My installs are non temperature controlled and the temps

Re: [Repeater-Builder] Re: Decibel dipole array sweeps

2009-03-22 Thread Jim Brown
I manage to clamp the addition to the element pretty tight with the machine screw and nut through a hole drilled through both sides of the flattened part of the addition wrapped around the element.   And since only aluminum touches the aluminum element, I don't see any dissimilar metal problems

Re: [Repeater-Builder] Re: Decibel dipole array sweeps

2009-03-22 Thread Jim Brown
We made one back in the '70s from 3/4 inch aluminum angle.  We sawed a vee at each bend point and welded the bent angle back together and made a very stable element.  The dimensions we used were from an old VHF handbook and the elements were spaced quite a bit farther from the mast than a

RE: [Repeater-Builder] Re: Decibel dipole array sweeps

2009-03-22 Thread Butch Kanvick
Great information. I was at Ace Hardware today and picked up some aluminum tape to seal an HVAC duct. I surprised how sticky the stuff was and you can cut it to fit the joint. I wonder if this would be any good for modifying a dipole? I am not sure how it would stand up in the elements

Re: [Repeater-Builder] Re: Decibel dipole array sweeps

2009-03-22 Thread Cort Buffington
Since there's been quite a bit of talk about extending the elements on DB224s, I'll throw my experience in. I tried to extend the elements on a DB420, using the method of adding screws at the bends to lengthen the elements -- this was a TEST, so I didn't get too worried about them being

Re: [Repeater-Builder] Re: Decibel dipole array sweeps

2009-03-22 Thread Cort Buffington
Oh yeah, I forgot. In the end my solution was to just use the DB420 as it is. It's worked ok. This spring we're replacing it with a Telewave ANT450D6-9. Yeah, a lot less antenna than the DB420, but it is designed to cover the amateur band, so we'll give it a go. On Mar 22, 2009, at 10:26

Re: [Repeater-Builder] Re: Decibel dipole array sweeps

2009-03-22 Thread Jim Brown
The dimensions are in the FILES here on the Repeater-Builder list. http://f1.grp.yahoofs.com/v1/MPvGSaXwn7VidapqNO9aJxssOWkx7N4yimg7VCgz9rDCxTSilYgmOPHi-yTakY_HTGB5tEDhwoOUFpePfhgiw9oi/db-224e-diagram-dz.pdf With the luck everyone had with Jeff's link, this one will probably not work.  But look

Re: [Repeater-Builder] Re: Decibel dipole array sweeps

2009-03-22 Thread Jim Brown
I had to copy the link and paste it into the browser and then go back through and take out all the spaces that Yahoo added, but with that done I got back to the doc OK. 73 - Jim  W5ZIT --- On Sun, 3/22/09, Jim Brown w5...@yahoo.com wrote: From: Jim Brown w5...@yahoo.com Subject: Re:

RE: [Repeater-Builder] Re: Decibel dipole array sweeps

2009-03-22 Thread no6b
At 3/22/2009 20:27, you wrote: Great information. I was at Ace Hardware today and picked up some aluminum tape to seal an HVAC duct. I surprised how sticky the stuff was and you can cut it to fit the joint. I wonder if this would be any good for modifying a dipole? The problem is that the

[Repeater-Builder] Misc. For Sale

2009-03-22 Thread hotfire00
Cleaning out the fire station storage room, and we have a bunch of stuff for sale: (1) Regency H256B field-programmable VHF mobile. Includes short power cord, mounting bracket, and hand mic. (1) Midland 70-340B VHF 32 ch 40W mobile. Includes mounting bracket and hand mic but no power cord. (1)

Re: [Repeater-Builder] Decibel dipole array sweeps

2009-03-22 Thread k5in
Kris Kirby, This is directed to you: If I have a DB413 and I am going to use it on 441.950 you are saying there will be some down tilt in the pattern? This doesn't bother me. I am more curious than anything about this antenna that is due to go up 140ft on a tower in a couple of months.

[Repeater-Builder] Re: OT: Making PDFs

2009-03-22 Thread rtsiexpert
--- In Repeater-Builder@yahoogroups.com, John J. Riddell ve3...@... wrote: Dave, try down loading a small program called Cute PDF writer...it's free and will make PDF's for you. It is set up as a printer but saves them to a file on your computer. 73 John VE3AMZ - Original Message

Re: [Repeater-Builder] OT: Making PDFs

2009-03-22 Thread Dave Gomberg
Gee, look at all the solutions to a problem I said I don't have. At 21:59 3/22/2009, Larry wrote: Dave, The OpenOffice Suite also exports to PDF. Free .. just download and install. Comes in Windows and Linux versions.

Re: [Repeater-Builder] OT: Making PDFs

2009-03-22 Thread Dave Gomberg
Gee, look at all the solutions to a problem I said I don't have. At 21:59 3/22/2009, Larry wrote: Dave, The OpenOffice Suite also exports to PDF. Free .. just download and install. Comes in Windows and Linux versions.

Re: [Repeater-Builder] PL Reeds

2009-03-22 Thread Ted Bleiman K9MDM - MDM Radio
try er...@aol.com  for the reeds.   Ted Bleiman K9MDM MDM  Radio    If its in stock...we've got it! P O Box 31353 Chicago, IL 60631-0353 773.631.5130  fax 773.775.8096    web http://www.mdmradio.com  email -  mdmra...@yahoo.com  DIRECT ALL EMAIL --- On Sat, 3/21/09,

  1   2   >