The old argument or idea you never need an amplifier is just as silly as saying you always do need an amplifier. I would guess the "rule" we never need -140dBm sensitivity is based on a suburban loc
First I have a question. How does a voice keyer send CW?? Or does it have a CW key output? To correct some misinformation about the MFJ432, it has been ground isolated since I was given the job of re
I wouldn't. But all that aside, I just wanted to clarify the redesigned unit has isolated audio grounds, and an isolation transformer. I think I caught all of the problems in the rework, including "
With no RF amp, it is possible to get into the -130dB or better range on sensitivity. But the biggest problems are actually poor filtering, poor gain distribution, and simple design errors. Narrow f
Using a noise blanker is a bad idea, but you know with a simple design change we COULD use our blankers with overload problems....but that is for another day. After some more thought, I revisited th
Hi Pat, Officials at the FCC have clearly stated they will ignore any request they deem to be a special interest request. This was repeated to me directly by the head of the rules branch within the l
Would this be a feeling like the one that overwhelmed me the other day when I moved off a DX station's the other day, and called another DX station for 20 minutes before realizing I was on split and
The pin spacing and size is very close, but a tiny bit different than all the other DIN plugs in the world. I spent about 30 hours looking for a replacement, and the only source I found is Yaesu. Yo
I don't really understand people who feel obligated to insult OO's, or make light of their efforts. This seems to be a trend that has spilled over from the rest of society that anything we do is OK.
I enjoy reading the "tips of the weak". I think most extra effort and skill comes from the people trying to hear QRP signals. The receiving party is the one doing the actual work, and suffering the
it doesn't matter at all, not one tiny bit, if we like to use different receive tones. As long as the transmitter is properly netted to the receiver in EACH station, they will be on the same frequen
used "spider the structure? about 2 ft. long All the data I've seen in actual statistical tests show they don't do anything. See: http://www.polyphaser.com/ppc_PEN1021.asp 73 Tom ___________________
K1TTT posted several references of scholarly and peer-reviewed papers by IEEE showing these spine balls do not work. The polyphaser site at: http://www.polyphaser.com/ppc_PEN1021.asp pretty much says
Bill and all, (You might repost this to cq-contest if it bounces Bill.) Every receiver problem I have ever experienced (other then when I am transmitting while listening on 160 meters) has only been
I disagree with Tadek on several points, but most important are: 1.) I work much more than 160. I find I need 80dB or more of close-spaced IM3 and blocking on 80 meters and higher. 2.) In a noisy loc
I certainly agree with this Mark! The ARRL 160 is more of a domestic sweepstakes contest. 73, Tom W8JI been a non-event problem is there DX is a not listening to _____________________________________
You might have to forward this Bill. I'm not on CQ contest. Bill and all, With virtually no increase in product cost or basic design structure, it is possible to correct almost all of the major probl
Hi Bob, I wish that were true, it would make life easier for all of us. Unfortunately it isn't. "Rounding" square waves requires the harmonics be removed, and that requires the "transformer" have res