I'd bet that the issue is the inverter, no matter how "stout" ... The AR-40 uses a very simple voltage comparator to control the motor; the reference voltage to the comparator is not regulated in an
Almost certainly a 2.25:1 un-un or a five winding toroidal transformer. 73, ... Joe, W4TV _______________________________________________ _______________________________________________ TowerTalk mai
Larry, Attachments are not forwarded my the reflector code. I suggest putting the pictures on-line and posting links to them ... 73, ... Joe, W4TV towers that I purchased locally several years ago. O
A proper high-pass filter on the receive would have resolved the issue without any need for heroic measures. Placing a low frequency short (beta match or trifilar voltage balun) across the antenna t
The advantage of an H-Frame ranges from somewhat less than 5 dB for systems with less than optimum spacing to slightly more than 6 dB with maximum gain spacing. Without doing the modeling, one can l
VE7BQH's information also uses free space designs since EME generally involves elevation above the horizon. Some can argue that HF use is better served by a more narrow but taller array which would c
Costs are not "getting spread through the industry nation wide" - just ask any Florida home owner. The "national" property and casualty insurers first established "Florida Only" subsidiaries and jac
On the other hand it looks like several key products - particularly the BPF-419 and the receiver protector - are no longer be available. 73, ... Joe, W4TV ____________________________________________
You have not been reading the right sources. 1.5 wave above ground has a lot more "bang" than .875 wave. In addition, stacking multiple antennas provides significant gain as well as diversity not av
Find a different roofing contractor - one who understands the issues of properly flashing roof penetrations. It is impossible to build a roof without penetrations and with rain rates reaching many i
I asked the same question of a well known Professional Engineer a couple of years ago. His answer was quite simple and made a lot of sense ... the round base can be used instead of a square one if th
Our discussion was about towers in general ... there was no mention of guyed vs. self-supporting or single pier vs. multiple pier (e.g., Rohn SSV with its wide base). In any case, looking at the Roh
The discussion I had with the PE was about tower bases in general. In *that* discussion we did not differentiate. However, since the Rohn documentation states that the CB1G *must* be square, there m
- snip - Quarter wave slopers need a good ground system for optimum performance. The support tower is connected to the ground - even just the lightning protection ground - and significant current wi
No, 1/2 wave is where a horizontally polarized antenna shows its first null directly overhead. 60 ft is 0.86 wave on 20 meters (14 MHz) - one wavelength is 70 feet. If I had to choose a single tower
Check again ... list all the products from that company on the R and L site. You will find both the D and the F2-D ropes which are Dyneema core (similar in performance/strength to Kevlar). The proble
Grant, Thanks for the confirmation. Looks like these Mastrant ropes might be useful for temporary tower installations at 10% preload but would require constant adjustment in permanent service. These
Reexam means the patent is being reviewed again to see if it was valid - specifically if the material covered was truly "novel." Whether the device/process in question was covered by other patents,
This assumes that the two meters are identical, calibrated identically and with identical deviations with frequency. At the very least, I would take measurements "both ways" - once with meter 1 on t