Did you reuse the black insert from the old insulators? They are designed to elevate the elements slightly in a gull wing in order to minimize element droop. When I had a 4/4 of 4el KLM's I lost some
Most likley it is Andrew especially since the connectors came with it. I have several 300-650' rolls myself and plan at least one 450' run. That stuff is HEAVY so make sure your tower can handle it.
Most of the used 1 5/8" Ive seen including the many rolls I have here had the jacket removed at regular intervals for bonding to the tower. I am "assuming" that doing similar to Dicks and attaching t
You can use that same method with 75 Ohm cable. You are looking for the null, not an absolute power value. The same holds with the NA, the null frequency will remain the same but the return loss will
In a similar vein many of the old boatanchor ham and SW receivers were designed for high impedence inputs to be used with long wires or open wire line. A low impedence antenna/feed will load down the
I've been contemplating supporting the elements also but not with Phillystran. Instead I would use some #14 hardrawn copper and wind up with a 2 el on 30M. I havent modeled it yet to see what spacing
The 1945 launched USN tanker I served on 1961-2 (USS Wacamaw AO-109) had a distribution/patch panel on the wall of the radio room. It used a 6AB7 as a cathode follower. Built by GR and used the famou
Add another $13 for the new clamps and 1/4" hardware. After awhile it starts to add up but if the MTBF increases from 1-2 years to 8-10 years its a bargain. Carl KM1H ________________________________
Im going thru a similar exercise right now. I'm installing 50' of 45G on an unequal pitch roof and bracketing in 2 places to the 3rd story of another section of the house. Ive built 2 brackets copied
NEC itself is not for the average user. Various versions are the basis for more user friendly programs such as YO and EZNEC. I find YO to be a superb program, easy to get used to and accurate. The re
Would it help to run 1/4" copper tubing (as used for refrigerator ice makers) in the trench? Then bond that to several ground rods and also tape the coax to that tubing. Carl KM1H ___________________
Hold huge beer parties every weekend. Carl KM1H _______________________________________________ _______________________________________________ TowerTalk mailing list TowerTalk@contesting.com http://
In my case the eaves are 12" plus I wanted a bit of extra clearance to be able to climb in/out the attic window. The only reason for this project is so that I can locate the 432 MHz thru 10 GHz gear
I dont know of any local source to me that has strap at a reasonable cost, they all have minimum orders. There used to be several scrap dealers that let me poke around but they have all been turned i
How come the extra weight of 55G when 45G or even 25G would suffice for that small load. Ive been involved in several roof top installs at commercial/industrial sites and roof loading weight was alwa
Where do you get your copperweld? I used to buy #12 rural phone wire in 1000' spools but its been discontinued wherever I check. Im going to need at least 10K feet. Ive found #14 at a few places. I a
Thanks for the details Chris. That roof must be a bit better constructed than some of the industrial buildings Ive installed on. I left the calculations to the building owners consultants but structu
Clifford was also my supplier; as of a month ago they said no more #12. I'll check again Monday to be sure; I was using a 20 year old part #. Do you have the part # of what you bought? Carl KM1H ____
Well, I did some digging, Clifford doesnt seem to provide much info online. However General Cable is one of their suppliers and they list #12 and # 14 in 4000' reels. I'll call Monday and see about c
If using a steel mast then first calculate the RF resistance at the frequency of operation. The RF integrity at the various junctions is also far from ideal. Aluminum is still the best for a radiator