Whenever I've thought I had stumbled onto a "breakthrough" in rf design, whether it be an antenna or a circuit, I have later found my measurement techniques to be lacking. Garbage In ... Garbage Out.
When figuring the cost, you might want to consider that the T-6 is closer to the 2 element SteppIR than the three in terms of gain and F/B. One point needs to be made, especially for contesters. The
I just ran a quick sweep of a 3el SteppIR model and the loss in the feedline alone due to mismatch is about 4dB at 1 mHz out and 10dB at 5 mHz out. Add to that the pattern loss and you're well over 1
I used a 3 element model in EZNEC... I'm pretty sure there's a model of stacked 3 el SteppIRs on my website at www.telepostinc.com/n8lp.html in the downloads section. You can delete the wires for the
I have done some measurements of skywave patterns with some success by integrating a number of readings over time for each azimuth setting. I have a little software utility I wrote that facilitates t
I posted a message a couple of days ago in this thread regarding a similar thing I did using a software utility I wrote to automatically rotate and integrate multiple passes of S-Meter readings and p
Jim, I'm not that familiar with the beacons, but since your post I did a little research. There are a couple of major problems. First, the transmissions are very short... there wouldn't be time for m
If you use the TRX-Meter utility to do your automatic plotting, it allows for precise calibration of the S-Meter against a standard. You just need a signal source and step attenuator to do the relati
You can do automated measurements with S-Meter readings if you use the attenuator to calibrate your S-Meter. This will give correct relative spacing between cal points in dB. If a signal source of kn
-snip All of which drifts away from the "using a receiver as a measurement tool" discussion. LPL's technique is still the best....use a real wattmeter, hold S meter reading constant and vary the tx p
You might want to consider folding the top over to get rid of the excess length. I don't think a mild slope will hurt anything, but a fold would be better, especially if you're planning a phased arra
This would be a design nightmare. You might want to consider a simpler approach. With three verticals in an equilateral triangle layout, and proper switching, you could build a parasitic array with a
Too slow, and too much wear and tear on the SteppIR I think. Larry N8LP Why open an element.. Just retract it into the housing... Just a thought Gil, W1RG -- Original Message -- From: "Larry Phipps"
I guess my answer was a bit abbreviated ;-) I just meant that it takes 30 seconds to retract the element, which would be an unnacceptable delay when changing headings, where a relay is instantaneous.
I think the original hypothesis involved a BiggIR, so I assumed 40m was needed. The problem with any array, parasitic or otherwise, is that more than a 2:1 bandwidth with fixed spacing would be very
You might also consider making your own using parts from someone like DX Engineering. There are lots of good monobander designs floating around. Larry N8LP Bill, Just a quick heads-up from my persona
I use a novel approach to tuning my E-Beam minibeam prototype from 14-30 MHz with fixed length elements. The same approach could be used for 3.5-7 MHz. My elements are fan shaped, so they are inheren
Just as was the case in selling valuable spectrum to the cellular crowd, the government (all parties, all agencies) find it hard to pass up the opportunity to raise money by selling something of valu
Look at the Tohtsu relays at www.rfparts.com. Larry N8LP _______________________________________________ See: http://www.mscomputer.com for "Self Supporting Towers", "Wireless Weather Stations", and
Ian, check out http://www.controlanything.com/Merchant2/merchant.mvc?Screen=PROD&Store_Code=NCD&Product_Code=R165W1LR It is a 16-channel wireless relay board with relays. It uses 418 mHz and has more