I just made a couple of measurements on my Corsair II: Pins 3 and 5 of U2 are at "mid-rail" - about 4v. That's what you would expect with the Reg supply being about 8v, and a mid-rail reference for U
Pretty high Q values can be achieved if you choose the toroid mix and the winding spec carefully. For example, according to the Micrometals Q Curve Application Information book a T200-6 core wound wi
I was responding specifically to the comment from K4TAX: "I'll take an air-wound inductor over a toroidal inductor any day, space available. The typical loss in an air-wound inductor is IR loss where
I hear the 21,320 kHz "birdie" on both of my CorsairIIs at pretty high level. The birdie tunes at 3 times the VFO rate; I believe it is the 9MHz product caused by: 3 x VFO - HFO = 3 x 5,330 - 6,990 =
The exact dial frequency where you hear the tone can vary slightly depending on the frequency of the HFO crystal oscillator. A 500Hz error in the HFO would place the spurious 1kHz from where it was e
Even measuring the load impedance wont immediately tell you what are the best settings, for a couple of reasons: 1) The HiZ / LoZ labelling is a misnomer for an L-network tuner; for example, for a lo
It might or might not be a high impedance load for the tuner, depending on the length of the ladderline. For example, an 80m half-wave dipole used on 40m will have a feedpoint impedance of 4000 Ohms
Jim, Those are important points of clarification that you raise!! I frequently hear folk commending ladderline-feed for a multiband doublet on the basis that "ladderline handles high SWR much better
Bob, One word of caution - you need to treat N6BV's loss figures for twin-wire lines with a big dose of scepticism; they are often a factor 2 optimistic! It's the case in every ARRL Antenna Book I ha
Perhaps I could comment: I can't claim to have made exhaustive measurements. What I _have_ done is fit the DDS to one of my remote VFOs so that I can A/B switch instantly between the original interna
I suggest researching shielded grounds very thoroughly; http://www.w8ji.com/coaxial%20currents/coaxial_line_and_shielded_wires.htm To quote: "It is electrically impossible to shield a ground lead." 7
Yes, vertically polarized signals also undergo ground reflections; however the reflection coefficient magnitude and phase are very different to those of a horizontally polarized signal, which is why
Rick, Hover your mouse over the top of the photo; you should see a "drop down" with station details. 73, Steve G3TXQ Only problem is, on most of them I could not recognize who they belong to.
I don't think that indicates a problem. I have two CorsairIIs - one of them "turns off" at 7.5 on the RF Gain, and the other one at 4. 73, Steve G3TXQ On 22/03/2012 00:46, Russ Straate wrote: Group.
I wouldn't expect the Accessory connector to need a jumper. From the look of the schematics, the remote VFO system - unlike the Corsair - leaves both PTOs running continuously; they simply switch the
I've had my 238 for many years and am not about to replace it. In 2009 I bought the balanced Palstar BT1500 to use alongside the 238 on my open-wire fed doublet. After extensive comparison measuremen
In a typical coax line, the dielectric losses don't exceed the copper losses until you get above 1GHz. At HF line losses are overwhelmingly copper losses, and dielectric losses can safely be ignored.
Here's an interesting paper by Wes Stuart N7WS on the topic: http://www.scribd.com/doc/7132619/Ladder-Line If you look at his Equation 2 for the total loss of twin line you can identify the copper lo
If you look at the technical data for a Belden solid dielectric RG58 (say 8259) and compare it with a foam dielectric RG58 (say 7807) you'll see that the centre conductors are significantly different
Here's some calculations to support that last comment: Solid dielectric coax Vf=0.66 and foam dielectric coax Vf=0.85, therefore relative dielectric constants must be 2.29 and 1.38 respectively. So,