Yes, that was a good idea, Larry. I was appalled by how undisciplined the pileup was on 30M CW. It was if everyone was calling blindly not listening to the DX station at all. They would come back to
I measured some swept type SMA right angles that I was using for a project last year using an HP network analyzer. They were only 0.15dB loss at 15 GHz. (yes count em - Gigahertz). 73 de Mike, W4EF..
The Diawa CS-201 is very good, but it is only 2 positions. In some instances the contact wipers on this switch loosen up where they attach to the output connector center contacts and rotate out-of-pl
MFJ sells industrial grade transformer oil by the gallon. Its a bit pricey ($24.95/gallon), but has better heat transfer than mineral oil. I bought a gallon to fill an old heath cantenna that I picke
Then I guess they are lying then. I own two dummy loads here. The second one came from MFJ in a box with a gallon of that same industrial transformer oil. 73 de Mike, W4EF............................
I don't know how to tell either as I have never had the two side by side to compare. Someone mentioned in an earlier post that mineral oil was selling for around $20/gallon in pharmaceutical quantiti
They had a Sommers tribander at the local club before I became a member. From what I understand, all the element halves on one side of the boom were cleaned off in a big El Nino wind storm back in th
I need to make a vertical shear plate (1/4" x 12" x 12") to hold up a tubular shaped current balun/dipole center insulator and was wondering whether UV stable black Delrin would be a good choice. Oth
I need to make a vertical shear plate (1/4" x 12" x 12") to hold up a tubular shaped current balun/dipole center insulator and was wondering whether UV stable black Delrin would be a good choice. Oth
Tom, et al: With regard to T-networks, this is why its important to record your tuner settings instead of searching for minimum VSWR each time. At the local club, one of my friends was using an MFJ-9
Yep, same here Tom. I can't match my dipole any better than 3:1 on 10 meters with my tuner, so I use the Drake L-7 as a buffer. The tuned input on my amp lets the solid state finals in my exciter see
Alex brings up a good question. When using an antenna tuner driving a long feedline, what does my final amplifier see during the transient response while the energy is sloshing back and forth between
Hi Kim, While 50 dB F/B is certainly possible with a 3 element yagi, it would generally only hold up over a very narrow frequency range and a very narrow range of elevation angles (imagine a deep, bu
Yes, I should have mentioned that I can place my RF attenuator in an external RX antenna loop through that is on the RX side of my rigs T/R relay. I wouldn't dare trust my ability to to keep the rig
Yes, the drivetrain disks work because they use staggered bolt patterns each with 4 metal sleeves buried in the rubber disk. This allows the bolts to be tightened down hard metal to metal with no slo
That was our thinking here, Pete. Big rotator, big antenna, HD mast. The rubber flex disc was just something that my friend and I thought would be fun to try. We figured that as long as that it didn'
Hi All, I need to restring a bundle of coax/rotator cables (4 x LMR-400, 3 x rotator) across a steel messenger cable suspended between two buildings (~100' span). What is the preferred method for att
Jose', You may have already done this, but a good test to isolate problems in the amplifier from the exciter is to key the amplifier manually using a shorting plug installed in the amplifier's T/R co
I suggest we create another reflector for these sorts of off-topic exchanges. We can call it TESTOSTERONE-TALK.COM Anyway, glad to see everyone in the spirit of the holidays :):) Merry Christmas and
Hi Jim, Yes, your numbers are correct - here are the formulae: k = 1.38 x 10^-23 Joules/(deg K) T = 290 K B = 10^6 Hz Pdbm = 10 * log (kTB) + 30 = -113.9 dBm 73 de Mike, W4EF.........................