Yep, automatic TTY networks go back a lot more than 50 years. Certainly with the Model 19 in the 1940s and probably before that. The ASR-33 and its "stunt box" are a true marvel of low cost mechanica
Dave, Remember that the reported S/N is relative to the receive station noise + QRM level. Since many TB stations don't have your antennas and have high noise, they can't decode you or report a poor
For simulating a solid conducting plate in NEC with wires, Roy Lewallen (EZNEC author) advises 0.1 wavelength on a side squares of wires. That would be 16m for topband. Since adding the mesh is a sea
It is well known by DXpeditioners and an EZNEC analysis demonstrates that verticals within 1 wavelength of the sea have greatly enhanced gain at low elevation angles in the seaward direction. There i
JC, Have you read the papers I cited? Looked at numerous reports from DXpeditions and several antenna experts re the performance of verticals NEAR salt water? google "vertical antenna near salt water
I pulled >1500' of 1" pvc water line in glued together 200' lengths 8" beneath an adobe cattle pasture using a Kellems swivel grip attached to a single point ripper on a 70hp tractor. My ripper was 1
On a couple of DXpeditions we damaged the front end of a couple of analyzers by transmitting on a nearby antenna on a different band so this is another hazard to be aware of. Grant KZ1W There is room
Small ditch diggers are usually available at Home Depot here and certainly at rental yards. For aggregated materials try and find one with carbide teeth, which last 10x longer than hardened steel. Al
Have you tried an SFX-500 connector? These are made for 1/2" bare Al hardline, 50 ohm but the 75 ohm center conductor should be smaller diameter. With a steppIR beam a broadband match is needed which
I agree that resonating 8 elevated radials would be a aggravating task. I have 8 10' elevated 125' +/- radials for my T loaded vertical. I made no effort to resonate them. OTOH, for one or two radial
Agree. At my QTH 47.6 N (Seattle) the oval is almost always in the way to EU so long path on 80 is more reliable winter months if the EU's hang around for the west coast sunrise. So far EU on 160 has
Interesting. Must be a fun place in the middle of Antarctic winter and keeping a 160m antenna up. OTOH, they can lay wire on the ice for a 660 ft elevated dipole. I had 3 SSB QSO's with them on 20m w
Agree, my DX Eng 4 sq vertical array (high impedance) is almost always the winner on 160 vs an 85' T, a toss up with a 2L beam @157' on 80m, and rarely better than the 3L 40m @ 140'. So I believe t
Me too. Or the inverse as I did, cut my T for the low end of the band. Then three series capacitors with PCB relays to short each individually (none, 1, 2, or 3) yielded nearly full band coverage <1.
Interesting source. The 5356 alloy would be the best choice for radial wires since the 5xxx series are of a corrosion resistant aluminum alloy. 5052 is the usual alloy for boat hulls in salt water.
Several suggestions, some already mentioned - Although your swr plot shows you are in the ballpark for resonance, the feedpoint resistance is very low, as mentioned likely 12 to 20 ohms. A transmiss
I have a 160m T with 8 elevated 125' radials and the currents are worst case 3:1 unequal for various reasons (nearby steel building & towers). I've modeled this with EZNEC Pro4 by placing the actual
I know at least CW operator N7QT will operate diversity reception, not sure it was yet in operation. Grant KZ1W Congrats on the QSO!! Tree N6TR I am not an expert on DX peditions, coming late to HF a
Agree, an array is an entirely different ball game. Thanks. Grant KZ1w 73, John W1FV I have a 160m T with 8 elevated 125' radials and the currents are worst case 3:1 unequal for various reasons (nea
A DHDL will fit in a lot less length and work better IMO than either Beverage choice. You can put relays in small boxes at the feed transformer and termination to flip the directivity with two feedl