Bob I am worried ! You have erected a tower without guys. You are now asking a friend to climb this tower, without guys, so that he can fix guy ropes to it ?? John G4ZTR --Original Message-- From: to
Hello all Somewhat off-topic, but I know there's a wealth of information here ...... I need to use a couple of Andrew connectors L4PDM-C, which are 7/16 DIN connectors for LDF4-50 cable. I have the c
Gentlemen Thank you all for the information provided. I am now suitably informed. What a great resource ! Regards John John, You can get a copy of the installation instructions here (assuming you hav
Hi Rudy Looks like you've had plenty of "advice" from this group. You are spot-on in your opening sentence, when you say that it's a "rather complex situation". You have already cast the base, so you
The slump test is a simple field indicator of the "workability" of the wet concrete. The test is done before the main part of the load is poured. However, the very first part of the discharge should
Oliver I have a smaller Versatower here, and knowing roughly what a HD tower looks like, I've done some basic calculations. Here's what I think:- Base Plate, approx 250kg Lattice sections, from 75 to
Hello John It's an interesting question that you pose. Have you investigated "Alumast"? It's available from SMC Communications, and is a triangular aluminium lattice tower which comes in 10ft long se
Hello again John, you haven't mentioned (unless I missed it) what you want to put on top of these masts. However, since you have considered not only lattice masts but also poles and timber constructi
About 15 years ago, I purchased a larger crank-up mast with a new base plate. Of course, the original holding down bolts were not in the right place for the new base. The old ones were cut off flush.
Mike Lots of aerials show a dead short to DC, don't worry. It's the impedance at the operating frequency that matters. Try it, transmitting low power, with an SWR bridge in line. John G4ZTR I bought
Kelly The handbook for the G-1000 mentions a mechanical stopper, but doesn't explain how this is achieved. The G-1000 DXC has variable speed, so if you are minded, you can start and finish rotation s
Hi Dick It depends somewhat on whether you have a tapering boom or not, and the distribution of load (elements) along the boom, but a rule of thumb I use is to go out 2/3rds of the length to the tip.
Morning all Yesterday I downloaded the demo version of Yagi Mechanical from the DX Engineering web site. It looks like it should be able to do everything I want. However, I have not been able to carr
All Regards John G4ZTR Morning all Yesterday I downloaded the demo version of Yagi Mechanical from the DX Engineering web site. It looks like it should be able to do everything I want. However, I hav
I completely agree with Joe. You need professional advice from a goetechnical / civil engineer. This is not a question that can be answered by suggestions or opinions offered remotely, ie without see
Hello all A friend has asked if I can mend his 23cms aerial from M Squared. It was dropped and the boom has fractured just beyond the joiner, which is a 7/8" diameter sleeve 6 inches long. What I hop
This might be a silly question, because I'm not familiar with the Ham IV - but how do you avoid having a senior moment and trying to rotate it too far ? John G4ZTR Anyone have any recommendations for
Steve You've had some useful replies, and an explanation of the purpose of connections to pins 1 to 5. You say you only have 4 pins connected in your box; there's your problem ! John G4ZTR Hey Guys,
This thread about towers which are bracketed to the house, and also guyed is very worrying to me. I'm a charted engineer, and I can see considerable difficulty in deciding how the various forces are
Hello all A friend of mine had an accident with his tilt-over tower and damaged his Cushcraft MA5B. He's asked me to look at making some repairs. I can straighten or replace the aluminium parts where