Hi Charlie, You/re right of course, it's 1 ft/nanosecond. Don't know what I was thinking. I was also focusing on CW DQRM, since that is 99% of what I operate, and since carriers and CW jamming havw b
For my StationPro controller I tested a variety of relays and eventually settled on the Tyco/Shrack (Mouser 655-RTB14012F). There are about 3000 of these relays in use now by StationPro builders, wit
I agree generally with these comments, except that my experience with CdAg contacts on receiving hasn't been that bad, provided that the application exercises the relays occasionally. Thus, using the
I'm not sure goosing the pull-in voltage is always a good idea. It may shorten the initial closing time a bit, but (depending on the relay) it can aggravate contact bounce, doing more harm than good.
Seems to me the devil is in the details. Obviously, if you pump enough RF power into the input of any SDR (e.g., 100W), eventually it is going to collapse. If the ADC can handle a few volts, that sho
Interesting comments, Steve, and to me quite on the mark. (In an ealier life, I was a physics prof, though I've forgotten most of what I once knew). Re the comment by another list member that "there
Hi Jim and the group, I apologize for creating confusion in my earlier post about the Central Limit Theorem. Let me try to clarify a few points that I glossed over. My example considered an SDR trans
Steve, I have two bidirectional beverages (NE/SW and NW/SE), each 720 ft long, configured in a V-shape. I'm using DXE switching and xfmrs, with the vertex of the V a 4x4 post. I use additional 4x4 po
I have the 26m (85.3 ft) Spiderbeam fiberglass vertical, with sixty 30m radials on top of sandy desert soil. It uses four 7m top hat wires, and is tuned to 1.820 MHz, where the VSWR is 1.47:1. I feed
I did some tests a few years ago on unshielded CAT6 (UTP) cable. The twisted pairs in the cable are rated at 100 ohm nominal impedance, so I paralleled two sets of twisted pairs together and measured
Here, 160m vertical had noise floor this AM of -103 dbm, with beverages (720 ft), about -118 dbm, measured with Flex 6300. No need for a preamp.BTW, 160 was poor this morning. Jim W8ZR ______________
Agree with Tom. My Flex 6300 calibrates signal strength directly in dbm, which makes a lot more sense to me than S-units. I've checked it with a switched attenuator, and it's quite accurate. The log
Guys, seems to me this topic has been worked to death. Maybe it's time to give it a rest. Jim W8ZR _________________ Topband Reflector Archives - http://www.contesting.com/_topband
When controversial topics are discussed on email reflectors, it's human nature for people to become emotional. However, it is important that exchanges remain polite and respectful of opposing viewpoi
Not a peep from them all evening into New Mexico. Frustrating! Jim w8zr Sent from my iPhone _________________ Topband Reflector Archives - http://www.contesting.com/_topband
Very weak this AM 1300-1345z, in New Mexico. Barely out of noise,with QSB. Many CQs with nobody replying. Usually have a pipeline into Pacific. 80m was bad, too. 73, Jim w8zr _________________ Topban
Had a weak opening into NM for about 10 mins from 0040-0050 UTC at 3538. Got them on second call, but nothing but QRN afterwards. Nothing on 160m. Jim W8ZR Sent from my iPhone _________________ Topba
Tim is an outstanding ham and a super nice guy, but he unfortunately inherited the "no schematic" DXE policy when he took his job. He does his best to provide customer support, which I appreciate, bu
I think some contest stations had directional receive antennas and omni transmitting antennas. There were times when S9 stations couldn't hear me at all, and I suspect they were just listening in a d
I'm afraid I've had bad experience with the DXE ladder line insulators. I used them on my 760 ft beverages, screwed to the top of 4x4 wood posts, spaced 60 ft apart. With the wind, they eventually sn