I would like some help to identify the make and model of a tower. It has three bent metal main legs and X-shaped cross braces. Each successive section of the tower gets a little narrower. There are s
Thank you everyone who wrote me about this tower. I have identified it as a Rohn HBX-48. In case others have a similar problem I thought I would pass along how I did it. The Rohn BX series towers are
I am making delay lines using coaxial cables. How does the velocity factor of a cable change with temperature and over time? Does anybody have information about this? Thanks. Rob AE7EG ______________
I am making an HF antenna and coaxial stub switching box. I would like to draw on the experience of this group to help me select SUITABLE RELAYS first time round, and to avoid poor choices. The first
Thank you to everyone who took the time to respond to my enquiry. You've saved me a lot of trouble. 73, Rob AE7EG Hello Rob, Been using 12 V SPDT Tyco/Potter & Brumfield relays in a couple of stub sw
Does anyone have a pdf of the manual for a BigIR Mark II vertical? If so, please send me a copy. The only manual on the Steppir site is for the latest model, the MarkIV version. Thank you. Rob AE7EG
Don't forget that the PSI rating of concrete is its final strength after the full curing period. You might want to use stronger concrete that sets up to your requirements sooner. Its ultimate extra s
I need to make "baluns" for 70cm and 23cm, something to thread over the coax to stop RF currents on the outside of the shield. I need something to go over a Type N male (ferrite ID >= 23.8mm) and dir
I would like to model the effect of mounting height and radial placement before installing this antenna. Does anyone have an EzNEC model he or she is prepared to share? Thanks. Rob K7QJ / G3WKH _____
Jim, Thank you for the reply. I have done modelling of verticals over various radial systems on a single band with results very similar to those you presented in your paper. What I would like to do i