Just a word of caution regarding lowering crank-up towers (increasing overlap) to reduce bending stress... It is true that lowering the tower decreases the overall moment reactions on the tower from
Hi Rick, Viscosity of ISO 460 converts to SAE 140, 75W140. Matt KM5VI gear oil in my US tower gear lube, a PAG type. Mobil 1 LS comes in 75W90 and 75W140. Which is correct for Hub City? Is 1 quart en
Thank Bob, Concur. But your question was choosing between 75W90 and 75W140, which are grades of differing viscosity indices rated under the SAE system. Hub city lubrication guide recommends PAG 460,
Spot on Hans - flue gasses can be quite acidic! Especially as the moisture content in the flue gas starts to condense at ambient temperature (dew point of most flue gas is well above ambient temperat
Most important - check the lubricant level periodically - especially if there are visible signs of seepage around the seal areas. There are sight plugs at different locations on the housing which are
Sorry that the info was not helpful for you Bob. You might want to take a look at the Mobil SHC 600 series lubricants. BTW, conventional petroleum based oils, synthetic PAO, and synthetic PAG are all
You hit the nail on the head Patrick. Most important is don't run it out of lube because you never checked the level... that would feel real bad for sure. KM5VI Just guessing but suspect lube change
Thanks for the post, but no offence taken Bob. :) Best 73! Matt KM5VI Matt, Thanks for the info. I reread my response to you and it seemed pretty brash and demeaning to me. I wanted to apologize Matt
??? Please explain. KM5VI Any gear with a 50% or better efficiency is NOT self breaking and will require a break. Even a slightly lower than 50% might (most possible) need a break as the efficiency w
This topic has come up before and I'm sure you will get a lot of answers, but here's mine: Most conventional concrete mixes will typically achieve about 50% of ultimate strength within 7 days, and wi
McMaster-Carr is another good source for just about any kind of hardware - especially stainless steels and brass. KM5VI _______________________________________________ _______________________________
I will be feeding several Hygain style, mono-band Yagi antennas through W2FMI HBH50 (1:1 Guanella) baluns. All my Yagis are matched using Hy-Gain style Beta matches clamped to the antenna booms. Sinc
Hi Mike, Just a few thoughts: Was you stub open or shorted? 1/4 wave shorted 40m stub should produce about 25-30 db nulls on 20m & 10m, but not 15m. Also may want to verify the tuning of the stub - i
Hi Rich, I had a similar issue a few years ago with some bolt holes in 3/4" A35 steel. Local shop with a plasma cutter took care of it quickly and very inexpensive. Matt KM5VI I had a ¾ inch steel pl
One afterthought, just want to confirm that you have the stub tee'd into the 40m transmitter line and not the 20m receiver line. Hi Mike, Just a few thoughts: Was you stub open or shorted? 1/4 wave s
Mike, Would it be hard to unplug the HB9V at the antenna and place a dummy load there instead of the antenna? Transmit on 40m and see if you are getting any interference. My thought is that this migh
My LM-470 (Tri-Ex era) does not really have a control box, just a motor rates 3P2T switch mounted in a NEMA enclosure wired to a 110VAC plug. If you would like a copy of the wiring diagram out of the
Sorry Roger, It was not clear from you first post that you have the optional limit switch controller. My documentation only covers the standard manual motor control (no limit switches). Doubt that it
I believe that if you are feeding the delta at the middle of one side, then the antenna's radiation pattern is vertically polarized and the horizontal parasitic won't do anything for you. I made a qu
My error Jim, I meant quad. Thanks. He doesn't have a delta. horizontal sensitive to each switching.... the spacing was fixed _______________________________________________ _________________________