Gil, The audio pick-off point for the AGC circuitry is _before_ the AF Gain control, so it shouldn't affect the AGC threshold - if it does something's wrong. Or do you mean that the RF Gain has to be
Gil, In my Corsair II manual, it's mentioned towards the bottom of page 2-4 under the heading "VFO IN-OUT" The jumper goes between the VFO IN & OUT sockets which are at bottom right of the rear panel
I had the same problem 6 months ago - it was mechanical failure, as Jerry said. If yours is the same as mine, it is possible to tell because the "action" feels subtley different. TT were able to supp
It frustrates me that TT switch that external capacitor into play as early as switch position 3 (out of 5) on the LoZ side. I've often needed a pretty large capacitor for my 160m antenna, and switchi
If you want to "dig a little deeper" and see how a local tuner affects the system match at a remote antenna feedpoint, you might like to take a look at the worked example here: http://www.karinya.net
James, Thanks! I must take a new photo of the shack - there's now another CorsairII alongside the existing CorsairII and OmniVI !! 73, Steve G3TXQ _______________________________________________ TenT
C31 is a frequency adjust trimmer in series with the original Oven Controlled crystal. The TCXO modification replaces that crystal oscillator and its buffer, and removes power from them. Adjusting C3
I'm still trying to work out whether an "Agronaut" is an Argonaut which is causing you lots of aggravation, or a new rig specially designed for _Field _Day :) Sorry - just couldn't resist! Steve G3TX
Take a look at the 8th line here: http://www.karinya.net/g3txq/chokes/ 10 FB-31-1020 beads slipped over RG213 produces a choke which is resitive from 4MHz to beyond 28MHz. However, I would agree that
It might be worth expanding on Jim's valuable point about the undesirability of chokes which have Reactive CM impedance, rather than Resistive. Here's an experiment those of you with antenna modellin
It's actually short of an electrical half-wavelength, which gives it about 300 ohms of series capacitive reactance. That reactance is then cancelled by the inductive CM choke, leading to a lower CM p
Just to expand my previous posting: With a 20ohm ground connection at the bottom of the braid, if the reactance seen at the dipole feedpoint looking into the braid path were cancelled by the CM choke
The chances of a Reactive choke decreasing the feedline CM path impedance may be much higher than many folk might think, particularly on a multiband antenna. Trying to assess the CM path impedance on
Dressing the feedline at right angles to the dipoles stops *induced* common-mode current, but it does nothing to stop *conducted* common-mode current if the feedline is coax. The model I investigated
Ladderline behaves differently from coax, and there might be a small impedance "bump" if you turn it abruptly through 90 degrees; however, in many ladderline applications that wont matter. It certain
Jerry, That shouldn't happen with a well-designed 1:1 Guanella Balun, which is the preferred choice for wide-band, wide-impedance-excusion, applications. Unlike a 4:1 Guanella balun or 4:1 Ruthroff b
Jerry, I was addressing my comments to your application, which I assumed - maybe wrongly - was a balanced-line-fed multiband doublet. The balun I referenced is aimed at 160m thru 40m use; but even at
Of course, the Johnson Matchbox has its secondary capacitors "centre-tapped" to ground; that makes it a "stiff" voltage source. In other words it's a VOLTAGE balun, just like the 4:1 Ruthroff found a
If that's a problem I would prefer to use a couple of high value resistors to leak the charge to ground, rather than compromise the current balance on the TL. Steve G3TXQ ____________________________
Jim, I agree! I've been doing some balance measurements on a 100ft doublet I have fed with ladderline. Because of its local environment it's a pretty unbalanced antenna system. I measured ladderline