Steve your rotator is the R3501 model, same as mine, I try to take a photo of the drawing but might not work it is not very contrastry. I emailed you direct but it was "550-"JunkMail rejected -" 73 P
I am quite happy with my Discoverer 2-element. Itīs now about 15 years on the tower and never had a problem, except the insulators on the driven element which burned out when I was not aware of icing
The only nuts and bolts I use on my tower are hot-dipped galvanized HV types. They are the only allowed on steel constructions in Germany. http://media.wuerth.com/stmedia/shop/masterpages0000/std.lan
Same here and also on boom guy wires. 73 Peter, DJ7WW Same here. That 1/4 EHS works great. seen a ham safety wire a turnbuckle. My turnbuckles are all wired. I just take a cut off piece of guy wire a
Jim, I donīt buy that. When the CM noise is, as you explained, coming down the inner conductor how could you measure any difference in CM current with a clamp on RF ammeter on a tower leg or feeder w
Use two pairs of Teflon covered wires in parallel. 73 Peter, DJ7WW I'm once again considering winding high power chokes with enameled wire. Zo of a closely #12 pair is about 53 ohms, which makes it d
Hi Herb, Happy Easter! I have two 40m yagis. The 2:1 SWR band width of my home brew 3-element full size is 495kHz. On the 2-Element HyGain it is 285kHz wide. 73 Peter --Original Message-- From: Tower
Hi Terry, The full size elements of my 40m yagi start with 2 3/8" tubing 0,1" wall thickness. Using larger tubing is far more effective then more wall thickness. I would go for a short dipole with lo
http://disti-assets.s3.amazonaws.com/cdmelectronics/files/datasheets/4697.pd f 73 Peter In general, RG-numbers are not a specification for coax. Rather, they define little more than the characteristi
Are you kidding? I would always prefer Spinner, RFS, Huber&Suhner etc. against Amphenol. 73 Peter, DJ7WW JUNK is defined as any coax connector that doesn't have Amphenol or a MIL-spec number stamped
Jeff, forget the original balun. 3-60 means it is a balun for the range from 3 to 60 MHz. I also provided half wave cable baluns on all my KLM yagis. http://a4.pbase.com/g6/91/283791/2/85975832.wTLsu
Me too. I use synchros in three of my rotators, one HyGain and two homebrew. At the moment I coupled a helipot mechanically to the receiving synchro for presets and end of travel switching. Synchros
A 1/4 wave length height IS exactly a cloud warmer. At least 3/8 wave length height is necessary for a lower take off angle. 73 Peter My experience is that 1/4 wavelength is okay to avoid a cloud war
Mine is suppressing noise from a high voltage line very well. I use this one: https://www.robkalmeijer.nl/techniek/electronica/radiotechniek/hambladen/qst /1995/09/page37/index.html 73 Peter even clo
4.3-10 connectors for 1 5/8" cable are available (male as well). https://products.spinner-group.com/4-3-10-female-connector-lf-1-5-8-50-multi fit-bn431022 73 Peter Bit of a circular argument I guess.
That is a bad idea, the torque force on the rotor under high winds will become much larger. 73 Peter --Original-Nachricht-- Betreff: [TowerTalk] High VSWR the required rotor torque will be sky high.
Jim, You did not mention before that the installation of a vane becomes necessary when you mount the boom at itīs center! With that vane I agree that the antenna is torque balanced but you need more
No, the wind aerea at the boom side with the element on is much larger then on the opposite side and turns the boom into the direction of the wind, always! 73 Peter I can't wrap my head around this.
Yes, that is the only reason for me to counter weight the boom, to have it straight when I pull up or lower the antennas. I do all my antenna work alone with the help of an electrical winch and need
Indeed, my VNA showed exactly that change of R when I did my climb to find the connection point for 160m. I omitted the shunt wire and feed the "50 Ohms point" directly against a single elevated slop