Re: [Repeater-Builder] WA6SVT coaxial collinear results
I know that if a part fails on ANY antenna everything changes, I used to recall the old Squallo antennas, I discovered a broken lead wire to the capacitor was giving a high SWR reading. I also recently bought a used 2M. Ringo antenna, cleaned it up, and retighten everything, works fine now. also I read enough material that a metal object so much distance away or even close will throw throw SWR readings off. Mark Holman, CRO AB8RU - Original Message - From: Paul Kelley [EMAIL PROTECTED] To: Repeater-Builder@yahoogroups.com Sent: Monday, November 01, 2004 4:32 PM Subject: Re: [Repeater-Builder] WA6SVT coaxial collinear results On Monday 01 November 2004 01:07 pm, Bob Dengler wrote: Cushcraft 4-pole is far from a dummy load. It may be mechanically fragile, but it has about the same gain as any other comparable dipole array. I probably shouldn't have made the dummy load comment. Mine acted like one, but I don't dispute that most of them work well. I just didn't have any luck with it for unknown reasons. Thinking it might have a problem in the phasing harness, I built a new one. That made no significant difference. Maybe the 4-pole didn't like its surroundings. Perhaps you had it adjusted for an omni pattern (each dipole rotated 90° from the one beneath it). This will NOT work on the UHF 4-pole will result in a very degraded pattern. It ONLY works when the dipoles are all lined up. No, they were all in line. I was (am) more interested in coverage to the west than anywhere else so I do what I can to favor that direction. Paul N1BUG Yahoo! Groups Links Yahoo! Groups Links * To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ * To unsubscribe from this group, send an email to: [EMAIL PROTECTED] * Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
RE: [Repeater-Builder] WA6SVT coaxial collinear results
Thanks Paul. Tony. * http://www.repeater-builder.com/antenna/wa6svt.html Paul N1BUG Yahoo! Groups Links --- Incoming mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.742 / Virus Database: 495 - Release Date: 19/08/2004 --- Outgoing mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.742 / Virus Database: 495 - Release Date: 19/08/2004 Yahoo! Groups Links * To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ * To unsubscribe from this group, send an email to: [EMAIL PROTECTED] * Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
Re: [Repeater-Builder] WA6SVT coaxial collinear results
At 10/30/2004 12:18 PM, you wrote: Unfortunately I don't have much to compare its performance to. The previous antenna was a Cushcraft 4-pole dummy load at the same height. The coaxial collinear provides MUCH better coverage (no surprise there BIG grin). Then your collinear must be very good, since the Cushcraft 4-pole is far from a dummy load. It may be mechanically fragile, but it has about the same gain as any other comparable dipole array. Perhaps you had it adjusted for an omni pattern (each dipole rotated 90° from the one beneath it). This will NOT work on the UHF 4-pole will result in a very degraded pattern. It ONLY works when the dipoles are all lined up. Bob NO6B Yahoo! Groups Links * To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ * To unsubscribe from this group, send an email to: [EMAIL PROTECTED] * Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
Re: [Repeater-Builder] WA6SVT coaxial collinear results
Here we go with gain again! A reminder that Crunchcraft rates every thing in DBc a made up gain. Not Dbd this is over a EIA 1/2 wave dipole. Keep this in mind when looking at antennas. Very best of 73, Russ, W3CH - Original Message - From: Bob Dengler [EMAIL PROTECTED] To: Repeater-Builder@yahoogroups.com Sent: Monday, November 01, 2004 1:07 PM Subject: Re: [Repeater-Builder] WA6SVT coaxial collinear results At 10/30/2004 12:18 PM, you wrote: Unfortunately I don't have much to compare its performance to. The previous antenna was a Cushcraft 4-pole dummy load at the same height. The coaxial collinear provides MUCH better coverage (no surprise there BIG grin). Then your collinear must be very good, since the Cushcraft 4-pole is far from a dummy load. It may be mechanically fragile, but it has about the same gain as any other comparable dipole array. Perhaps you had it adjusted for an omni pattern (each dipole rotated 90° from the one beneath it). This will NOT work on the UHF 4-pole will result in a very degraded pattern. It ONLY works when the dipoles are all lined up. Bob NO6B Yahoo! Groups Links Yahoo! Groups Links * To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ * To unsubscribe from this group, send an email to: [EMAIL PROTECTED] * Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
Re: [Repeater-Builder] WA6SVT coaxial collinear results
At 11/1/2004 11:46 AM, you wrote: Here we go with gain again! A reminder that Crunchcraft rates every thing in DBc a made up gain. Not Dbd this is over a EIA 1/2 wave dipole. That statement may be true in regards to some of their other antennas, but is incorrect w.r.t. their omni dipole arrays. Bob NO6B Yahoo! Groups Links * To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ * To unsubscribe from this group, send an email to: [EMAIL PROTECTED] * Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
Re: [Repeater-Builder] WA6SVT coaxial collinear results
If Paul is amenable to it, I'll post his email as a web page indexed right under the original article. It will be a One person's results type of article (look at the 6m heliax duplexer article and it's One implementation of the above design) for an example of what I have in mind. And I agree - a few photos would be nice to have. Mike WA6ILQ At 02:53 PM 10/30/04, you wrote: Hey Paul, How about posting some pictures somewhere so we can see your creation? Thanks, Jeff N1KDO At 04:18 PM 10/30/2004, you wrote: Recently when I said I was building one of these, some folks wanted my evaluation of it when it was completed. I've misplaced your emails (I hate when that happens!) so will post it here and hope Kevin doesn't mind. I built a 10 element UHF version. One minor concern: I couldn't change the SWR at all by moving the decoupling sleeve up or down. However, it's OK since the SWR minimum is exactly on my design frequency. Impressive. I was actually shocked to find the SWR did not change appreciably between top mounting, side mounting at 1/2 or 1/4 wavelength. I expected it to complain about the nearby tower when side mounted. It doesn't even seem to notice. Unfortunately I don't have much to compare its performance to. The previous antenna was a Cushcraft 4-pole dummy load at the same height. The coaxial collinear provides MUCH better coverage (no surprise there BIG grin). I have a VHF repeater at the same site (1 dB less power into a 5 dB gain commercial StationMaster). Over flat terrain VHF and UHF coverage is very nearly identical. In rolling hills VHF is generally better, as you might expect. In mountainous terrain VHF sometimes has the edge, other spots the UHF wins hands down. I wish I could offer more meaningful comparisons. I'm quite happy with it and plan to build more of them for other sites and applications. Paul N1BUG Yahoo! Groups Links * To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ * To unsubscribe from this group, send an email to: [EMAIL PROTECTED] * Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
RE: [Repeater-Builder] WA6SVT coaxial collinear results
This sounds like a very interesting project. As I somehow missed the start of this thread please let me/us know what the original project plan is and where it came from. Tnx Tony VE3DWI -Original Message- From: Paul Kelley [mailto:[EMAIL PROTECTED] Sent: October 31, 2004 07:26 To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] WA6SVT coaxial collinear results Hi Mike, Jeff, et al. You can use the email any way you like. I didn't take pictures during construction, but wish I had. I didn't anticipate the interest! I will be starting construction on another one very soon and I promise I will get some pictures this time. What I didn't mention in my original email (because I wasn't sure I could describe it adequately) is that I used a slightly different approach to supporting the weight of the antenna inside the radome. Perhaps this will be of interest to someone, perhaps not. I will try to describe it, but this is where a picture would help. Refer to step 8 in the construction article. For 445 MHz the half wave brass tube would be 13.25. I made mine about 17 so the soldered connection to the RG-213 shield would be below the decoupling sleeve. After soldering the feedline braid to the brass tube, I put a 2 long piece of 1 diameter heavy wall heat shrink (the type lined with hot melt adhesive) over the joint and shrunk it in place. After letting that cool, I placed a 1 length of the same shrink tubing over the upper portion of the first piece. After shrinking and cooling, the bottom edge of this piece provides a shoulder which can be used to support the weight of the antenna. I made a round disc from a piece of 1/4 thick delrin plate (other materials could be used) with a hole in the center just large enough to slip over the inner piece of heat shrink. I also drilled a couple of 1/4 holes in the disc for ventilation. Once the antenna is in the radome, 3 or 4 small holes can be drilled through the radome into the edge of this disc, so that it can be secured into the radome with screws. Alternatively, the screws can protrude through the radome just below the disc to that it rests on top of the screws to carry the weight of the antenna. Be sure the screws are not long enough to damage the feedline. This method supports the weight from the bottom while keeping the antenna base centered in the radome. Paul On Sunday 31 October 2004 02:06 am, Mike WA6ILQ wrote: If Paul is amenable to it, I'll post his email as a web page indexed right under the original article. It will be a One person's results type of article (look at the 6m heliax duplexer article and it's One implementation of the above design) for an example of what I have in mind. And I agree - a few photos would be nice to have. Mike WA6ILQ At 02:53 PM 10/30/04, you wrote: Hey Paul, How about posting some pictures somewhere so we can see your creation? Thanks, Jeff N1KDO Yahoo! Groups Links --- Incoming mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.742 / Virus Database: 495 - Release Date: 19/08/2004 --- Outgoing mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.742 / Virus Database: 495 - Release Date: 19/08/2004 Yahoo! Groups Links * To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ * To unsubscribe from this group, send an email to: [EMAIL PROTECTED] * Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
Re: [Repeater-Builder] WA6SVT coaxial collinear results
On Sunday 31 October 2004 10:59 am, Tony lelieveld wrote: This sounds like a very interesting project. As I somehow missed the start of this thread please let me/us know what the original project plan is and where it came from. http://www.repeater-builder.com/antenna/wa6svt.html Paul N1BUG Yahoo! Groups Links * To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ * To unsubscribe from this group, send an email to: [EMAIL PROTECTED] * Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
Re: [Repeater-Builder] WA6SVT coaxial collinear results
Hey Paul, How about posting some pictures somewhere so we can see your creation? Thanks, Jeff N1KDO At 04:18 PM 10/30/2004, you wrote: Recently when I said I was building one of these, some folks wanted my evaluation of it when it was completed. I've misplaced your emails (I hate when that happens!) so will post it here and hope Kevin doesn't mind. I built a 10 element UHF version. One minor concern: I couldn't change the SWR at all by moving the decoupling sleeve up or down. However, it's OK since the SWR minimum is exactly on my design frequency. Impressive. I was actually shocked to find the SWR did not change appreciably between top mounting, side mounting at 1/2 or 1/4 wavelength. I expected it to complain about the nearby tower when side mounted. It doesn't even seem to notice. Unfortunately I don't have much to compare its performance to. The previous antenna was a Cushcraft 4-pole dummy load at the same height. The coaxial collinear provides MUCH better coverage (no surprise there BIG grin). I have a VHF repeater at the same site (1 dB less power into a 5 dB gain commercial StationMaster). Over flat terrain VHF and UHF coverage is very nearly identical. In rolling hills VHF is generally better, as you might expect. In mountainous terrain VHF sometimes has the edge, other spots the UHF wins hands down. I wish I could offer more meaningful comparisons. I'm quite happy with it and plan to build more of them for other sites and applications. Paul N1BUG Yahoo! Groups Links Yahoo! Groups Links * To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ * To unsubscribe from this group, send an email to: [EMAIL PROTECTED] * Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
