Another possibility for balanced, low impedance cable, is Cat-5 Ethernet cable. Each pair has an impedance of about 100 ohms, and if you parallel all 4 pairs...
... I posted this same info a few days ago. Maybe my posts are not showing up. ... This is a common misconception. The loss of CAT 5 twisted pair is a few dB...
Sorry, If I missed your earlier post. I am away from home and trying to keep up with a web email reader. I did not mean to imply that the loss would be lower...
... Yes, you are right that the loss would be lower with parallel CAT 5. However, 22 AWG enameled twisted pair would not realize an impedance as low as 25 ohms...
As far as I can determine, Lefferson's 1971 paper on twisted wire transmission lines formed from magnet wire is primary source document. One of his concluding...
... Somewhere, in the last year, I came across a webpage with good information about low impedance twisted pairs or parallel wires. IIRC, it mentioned the...
... Wish I could. Can't find that webpage article right now. I'm fairly sure I took a snapshot of it so I probably have it on the other computer's disk. ...
I don't have the info available, but many years ago there was also a shielded pair cable called (I believe) "Twinax". I seem to recall that it was 75 Ohms,...
I am not sure that CAT-5 would be the best thing to use at RF. As one who has probed 100 Mbit Ethernet, I can tell you that the received waveform is severely...
The JK (or JKT?) indoor phone wire I have seen, is four wires with a gentle twist of the whole bunch. Taking a cross section, the four wires are in a square....
When I'm winding 12.5/50 Ohm 1:4 current baluns and need a winding Zo of 25 Ohms, I use a couple of lengths of RG316 wired in parallel (total power handling...
According to the data published here (http://www.cerrowire.com/consumer-rg6u-coax), CAT-5 has lower insertion loss (attenuation) than inexpensive coax. For a...
... I measured 2.3 dB per 100 ft. at 10 MHz. This is slightly higher than the number above, if adjusted for SQRT(frequency). The loss is very close to the...
... If you wire the cable as the traditional "4-wire line" then it turns out that the characteristic impedance is 70.7% of the impedance of an individual side...
... Have you a reference for this 4 wire transmission line configuration and impedance? I can't find one. All I find is references to star-quad audio cable,...
Hi, did anybody actually tried this back in 2005 or later? Are there any results? This thread is pretty old and seems to lack any conclusion :) I was planning...
Hello all, I have been a very keen VHF DX chaser for over 20 years, until a house move in 2009 stopped me having beam antennas. When I ordered my Wellbrook...
Phil, All ALA1530 loops built before 2010 would have a similar VHF responce as mentioned in your post. The reason for the inclusion of the VHF filter was due...
No, I haven't tried a variable dielectric capacitor, but I have tried what I called a "floating rotor" variable capacitor with a metal plate rotating into and...
... Are you saying that the amplifier input impedance is a positive reactance that tracks the positive reactance of the loop? Or is it possibly a resistive...
Should work. By theory a capacitor is nothing more than 2 opposite potential surfaces separated by a dielectric (air, fiberglass, some sort of plastic, etc)....
Rick N6RK wrote on May 17. Are you saying that the amplifier input impedance is a positive reactance that tracks the positive reactance of the loop? Or is it...
Hi all. For those interested in the use of CAT5 cable, have a look at this site. http://www.lz1aq.signacor.com/ I have one of LZ1AQ'S loops here and it is now...
