Re: Topband: Insulator problems
Herb, Try Fair Radio Sales in Lima, OH The catalog I have shows a 5-1/4in diameter thru panel insulator. Ron N9AU -Original Message- From: Topband [mailto:topband-boun...@contesting.com] On Behalf Of Herb Schoenbohm Sent: Tuesday, December 17, 2013 1:19 PM To: topband@contesting.com Subject: Re: Topband: Insulator problems My 160 meter ATU uses an old military box with the original behive feed thru insulator that is starting to crumble. I haven't been able to find a pocelin feed thu of that size (about 3'') and the ones on e bay are very small. Any suggestions for a source? Herb Schoenbohm, KV4FZ On 12/17/2013 3:09 PM, w9...@aol.com wrote: > When I lost my last set of monster buss bar ceramic insulators to > breakage due to a broken guy line on the tower, I replaced them with > artificial wood. I used 4 X 4's. It machines easily and works > flawlessly wet or dry with full power even in very high voltage > conditions. The material is actually made from recycled milk > containers, so the factory told me. Anyone who wants a picture, I'll send it to you. > 73, Barry W9UCW > _ > Topband Reflector Archives - http://www.contesting.com/_topband _ Topband Reflector Archives - http://www.contesting.com/_topband _ Topband Reflector Archives - http://www.contesting.com/_topband
Re: Topband: Beverage transformer enclosures
A short length of SH 40 PVC pipe with end caps works good. Cement only one end cap. Mount any connectors/screw terminals to the pipe or cemented end cap. Tape seal the other end cap and keep the assembly vertical with the tape sealed end up. You will have easy access to the enclosed hardware. Ron N9AU -Original Message- From: topband-boun...@contesting.com [mailto:topband-boun...@contesting.com] On Behalf Of Paul DeWitte Sent: Thursday, November 10, 2011 5:11 PM To: topband@contesting.com Subject: Topband: Beverage transformer enclosures What do you use for transformer enclosures? The ones that I have been using did not stand up. Just curious what others use. Thanks 73 Paul ___ UR RST IS ... ... ..9 QSB QSB - hw? BK ___ UR RST IS ... ... ..9 QSB QSB - hw? BK
Re: Topband: F fitting adaptors
Bruce, if you insist on using the Ameritron, PL259 to F adapters are available at Tower Electronics in Green Bay, WI They have an online catalog. Ron N9AU -Original Message- From: Topband [mailto:topband-boun...@contesting.com] On Behalf Of Tom W8JI Sent: Tuesday, December 04, 2012 5:25 AM To: Bruce; topband@contesting.com Subject: Re: Topband: F fitting adaptors > When using a Ameritron remote antenna switch with SO-239 fittings, > does anyone know a supplier for female F fitting to PL-259 adaptor ? > > Thanks, > 73 > Bruce-K1FZ Bruce, IMO, you have the wrong switch. A transmitting type high-power switch is a terrible device for receiving. The larger the relays (has a general rule) the greater the problem, and it has nothing to do with sealed (enclosed) or unsealed (open) relays. High current relays are very problematic when only used at low power. The problem surrounds the large contact area and lack of wetting currents, and no significant voltage and current ever being applied to burn through any film on the contact. There are hundreds of papers by relay manufacturers or others detailing this problem, and it even occurs with brand new sealed or enclosed relays. The only high power relays immune to this issue are vacuum type relays. I think you are heading for long term problems with adaptors and a transmitting switch. 73 Tom ___ Topband reflector - topband@contesting.com ___ Topband reflector - topband@contesting.com
Re: Topband: Missing K1N 160m QSO records just uploaded to Clublog
Many 160m Q's from 4 Feb still missing from upload made a few minutes ago. Ron N9AU -Original Message- From: Topband [mailto:topband-boun...@contesting.com] On Behalf Of Lloyd Berg N9LB Sent: Friday, February 06, 2015 11:41 AM To: topband@contesting.com Subject: Topband: Missing K1N 160m QSO records just uploaded to Clublog All, They just uploaded the missing K1N 160m QSO records to Clublog site a few minutes ago. ~ 7000 entries! ... including my missing 160m QSO :-) 73 Lloyd - N9LB _ Topband Reflector Archives - http://www.contesting.com/_topband _ Topband Reflector Archives - http://www.contesting.com/_topband
Re: Topband: Fwd: Re: inv. L
There is a product called "Liquid Tape" that is available from hardware stores and home improvement centers. It has to be applied in layers but aggressively adheres to the coax end. You need to pay special attention covering the braid since water will wick. Ron N9AU -Original Message- From: Topband [mailto:topband-boun...@contesting.com] On Behalf Of K1FZ-Bruce Sent: Thursday, October 20, 2016 8:53 AM To: Topband Subject: Topband: Fwd: Re: inv. L I waterproof with silicon as best possible, and the most important part is make an upside down U turn in the coax at the end. Water does not "like" to flow up hill in most cases. 73 Bruce-k1fz On Thu, 20 Oct 2016 09:16:08 -0400, Art Snapper wrote: I had a few hours free yesterday afternoon, so I began the dual 80/160 radiator inv. L project. In the process, I found that water had entered the coaxial center insulator that was used at the feedpoint of the antenna. Does anyone have a favorite solution for a weatherproof, coaxial feedpoint for this type of antenna??? The radials are attached to several load center ground bars, that are screwed into a copper pipe that is driven into the ground. The pipe gives me a rigid mounting point for some kind of insulator or standoff. BTW, after a temporary fix, I ran some quick SWR tests. There appears to be very little interaction between the elements. At least from an SWR perspective. de Art NK8X ᐧ On Mon, Oct 17, 2016 at 11:16 AM, Art Snapper wrote: > I was considering adding a second vertical element to my 160 inverted L. > This one would be roughly a quarter wave tall for use on 80. > > I tried modelling in Eznec, but wasn't comfortable with the results. I > may have screwed it up. > > Has anyone tried it for real? Is it a big compromise on either band? > Would a switch at the feedpoint have any benefit? > > My inverted L has about 50 radials. > > 73 > Art NK8X > _ > Topband Reflector Archives - http://www.contesting.com/_topband > _ _ Topband Reflector Archives - http://www.contesting.com/_topband _ Topband Reflector Archives - http://www.contesting.com/_topband
Re: Topband: 160m Vertical matching Help
Trevol, the portion of the coil between the tap and the base of the vertical determines resonance and needs to be variable unless you were lucky and found the correct value. The shunt portion of the coil affects the feed impedance. This shunt portion is like the hairpin match for a yagi. You select the series inductance to make the antenna slightly capacitive and adjust the shunt inductance to raise the feed impedance. Both these moves interact. Use a clip lead to vary the inductance of the series coil. Cheers, Ron N9AU -Original Message- From: Topband [mailto:topband-boun...@contesting.com] On Behalf Of MR TREVOR DUNNE Sent: Wednesday, November 01, 2017 12:12 PM To: Wes Attaway (N5WA) Cc: topband List Subject: Re: Topband: 160m Vertical matching Help Hi Wes Thanks for the reply I can move the point of lowest SWR by moving the tap on the coil, I need to lower the SWR I thought using the coil across the feed point would do this but its not working for me?? Thanks Trevor EI2GLB - Original Message - From: "Wes Attaway (N5WA)" To: "MR TREVOR DUNNE" , "topband List" Sent: Wednesday, 1 November, 2017 17:02:55 Subject: RE: Topband: 160m Vertical matching Help Without doing any modeling, an off the top of the head idea, one option would be to drop a wire down from the end of each of the T wires you have at the top. You might be able to move the point of lowest SWR down to 1.8 with 2x 15' +/- drop wires. --- Wes Attaway (N5WA) (318) 393-3289 - Shreveport, LA Computer/Cellphone Forensics AttawayForensics.com --- -Original Message- From: Topband [mailto:topband-boun...@contesting.com] On Behalf Of MR TREVOR DUNNE Sent: Wednesday, November 01, 2017 11:54 AM To: topband List Subject: Topband: 160m Vertical matching Help Hi All I finally got the vertical up and running, problem I have now is I can't find a low SWR on the coil, the best I can get is about 2.8:1 no matter where I tap the coil that's the best SWR, I can move that point up and down the band by moving the tap but the SWR stays the same, My current set up is about 55ft vertical I have 2 loading wires in a T shape, wires are 50ft either side of the vertical and the are pretty level and in line, I have 38 radials averaging about 45-60ft long, I will add more when time allows but don't the make the SWR worse ?? With no coil I get resonance at 2.12mhz with R=16 X=2 on my MFJ269, The coil is 25ft of 5mm copper brake pipe in a 4" diameter, the coil is attached to base of the vertical and the other end is grounded, Any pointers on what I can do to get a better match, Thanks Trevor EI2GLB _ Topband Reflector Archives - http://www.contesting.com/_topband _ Topband Reflector Archives - http://www.contesting.com/_topband _ Topband Reflector Archives - http://www.contesting.com/_topband
