Jerry, A picture paints a thousand words - take a look at Figure 9 here: http://www.vk1od.net/VSWR/displacement.htm it shows what I was trying to describe. Notice how unmatched loss (the red line) is
Jerry's correct - you need the Pin 2 to Pin 6 jumper to enable the internal Corsair PTO. Steve G3TXQ _______________________________________________ TenTec mailing list TenTec@contesting.com http://l
Mike, At the risk of stating the obvious, the Argosy II fault would seem to be somewhere in the Tx chain that is unique to 80m. That doesn't leave a lot: Heterodyne Oscillator Xtal Bandpass filter PA
1) Tuners struggle most when they're dealing with low impedances at low frequencies. So, using an electrically short dipole on 160m and then dividing the impedance by 4 is a bad idea - much better to
I have a BT1500A and it's a fine piece of kit. However the L-network configuration means it has limited matching range on 160m. Steve G3TXQ _______________________________________________ TenTec mail
That would be the first place I would look. I've also had problems with the Corsair II current metering; in each case it turned out to be nothing wrong with the signal chain - just the metering. Stev
Have you ever considered that providing a better local RF "ground" could make "RF in the shack" problems worse? Take the example of a half-wave dipole fed with coax that is a multiple of a half-wavel
Gary - not sure what point you are making. Say we did have the perfect RF Ground at the radio, impedance zero, voltage zero. That's when the common-mode current is highest and when the radiation from
Mike, I'll confirm that! I'm just looking at two un-opened rebuild kits, and neither contains the Drive Rod (90202). Nor did the two kits I've used previously. 73, Steve G3TXQ _______________________
Mike, Interesting - I wonder when you bought those, and if TT have changed their policy? Steve G3TXQ _______________________________________________ TenTec mailing list TenTec@contesting.com http://l
As I understand it, the phase noise performance of a DDS is not as good as a well-designed PTO. Would a better solution be to use a "huff & puff" style stabiliser for the existing PTO? That way you g
Can I correct one common misunderstanding about low-pass L-network tuners. The two network configurations (shunt C at the output, or shunt C at the input) do not correspond to Hi-Z and Lo-Z loads, de
I'll say it again folks: these are misleading labels! A load of 2+j10 needs the **same** configuration as a load of 1000+j1000: shunt C across the load. A load of 2+j9 needs the **same** configuratio
That's not true of all baluns. The flux in the ferrite core of a 1:1 Guanella balun wound with coax depends on the common-mode current, not on the differential-mode current; so it's not directly rela
Jerry, Yes, it makes you wonder why tuner manufacturers persist in fitting *voltage* baluns when what we're usually trying to do is balance the *currents*! But I see some of them are learning, and in
Gary, The Hi-Z, Lo-Z labels are bad enough, but Palstar really screwed up on their BT1500A tuner - they labelled the configuration switch "High-Pass" "Low-Pass" !!!! Interesting that they reverted to
Andrew, No, you don't grease the outside surface of the core! 73, Steve G3TXQ _______________________________________________ TenTec mailing list TenTec@contesting.com http://lists.contesting.com/mai
Andrew, I've rebuilt several Corsair II PTOs and I don't recall there being a second pin. Could it simply be a spare which TT ships because it's a part that is easily lost? 73, Steve G3TXQ __________
Andrew, Understood! If I recall correctly, the pin on the Corsair II rebuild kit was a very small "roll pin". If yours is the same, gripping it with pliers and rotating it as you push it in may help;
Gil, I had that problem and it turned out to be a faulty front-panel switch. You can check by temporarily lifting connector #92 from the IF/AF Board - that should bring the AGC on in the FAST mode. I