When I replaced my CorsairII PTO with a DDS, I measured a *decrease* in close-in phase noise! What increased was the number of "spurs" on the VFO signal. Most of those spurs tune at many times the fu
The article by Wes Stewart that I referenced earlier: http://www.scribd.com/doc/7132619/Ladder-Line was published in the ARRL Antenna Compendium Volume 6. It shows measured losses for various commerc
Rick, When W1ZR's article appeared in the November 2009 QST it was *very* controversial. Here's an example of the typical debate it engendered: http://www.eham.net/ehamforum/smf/index.php?topic=44059
Hi Joel, Nice to hear from you! The ladderline loss figures quoted in the Antenna Book - which I believe are also repeated in TLW - are out by a factor 2. It's very easy to demonstrate that with a si
Joel, I'm giving some thought to how I would replicate your experiment to satisfy my own curiosity, and I have a couple of questions about the technique you used. From your article I gather that when
Joel, Thank you for that explanation. I was puzzled because neither in the text nor in the block diagram of the test setup is there any mention of a tuner at the signal generator end, and I can only
Jim, What "bugs" me most about this issue is that it isn't Rocket Science - simple application of Ohm's Law will give you the answers. Take the figures for Wireman 553 ladderline which has #18 conduc
Joel, Then that puzzles me even more ! If you made a change to the line and then adjusted the single tuner at the load end, the impedance terminating the line changed. If the terminating impedance ch
Joel, With respect, it's not the end of the story - the generator *can't* always have been delivering all it could to an optimum load if that load changed with differing line conditions. Let me take
Paul, If the frequency display is OK I wouldn't immediately suspect the uP chip. As someone else said, check that the uP is seeing the keying clock (Pin 7); you might also check whether the keying is
That sounds perfectly normal! On Receive, whatever the mode, the CorsairII frequency readout always shows the *zero-beat* frequency; in other words it will read 750Hz (approx) different from a CW sig
I'm still no wiser :) What was his reason for omitting mention of TT? Steve G3TXQ NOW FELLERS... Don't we have enough problems promoting TT gear without imposing our own limitations based on speculat
Is the problem present on SSB (normal), SSB (reverse), or CW? Or all 3? Steve G3TXQ Upon installing it and actually using the rig a bit, however, I note that my Tx and Rx freq are not aligned. Its no
I wonder if anyone can confirm if the PA assembly used in the CorsairII is the same as that used in the original Corsair. I believe it may be, and that the same one may also have been used in the Par
If the problem is still present when the Offset Tuning is off, it can't be the balance of those pots. With the OT switched off, the *same* pot signal is used both for Tx and for Rx. 73, Steve G3TXQ 7
Just follow the schematic! Steve G3TXQ Mike N4NT If the problem is still present when the Offset Tuning is off, it can't be the balance of those pots. With the OT switched off, the *same* pot signal
Barry, When you have OT switched off, the PTO varactor voltage comes from an internal pot on both Tx and Rx. The front panel pot is inoperative! When you have OT switched on, the PTO varactor voltage