I have the 229B tuner, which I think is the same tuner internally as the 238, but with different colors on the exterior. I find it somewhat difficult to find matches with the fixed-value switched cap
I believe that most MFJ tuners use the T network and TenTec uses a swtichable L network. L networks are know for their low loss while the losses in T networks can be quite high. Once a match is fina
We're getting into an area I don't know about- I thought the MFJ used the same circuit the ARRL handbooks show as the SPC transmatch, known as the PI network? Go ahead, I'm learning! Yes, this is tru
I replied to someone earlier, and was under the impression that the MFJ-989 was (is?) a PI network tuner, the same as the SPC transmatch. Am I incorrect? It's been a few years since I sold it. Is a P
Well yes, the T-match is a Pi circuit (the 989/949/941 tuners), but the SPC is a funny variation on it and isn't the same thing. It's got the extra section of the split cap going to ground in paralle
No, it uses a T network. This is a very common circuit. (I think the SPC uses the same) One capacitor from the input to the inductor, another cap from the inductor to the antenna. The other leg of th
the Mea cupla -- you're correct. T-match and Ultimate match (and I assume the SPC) circuits do tune in a similar fashion. Bill Coleman, AA4LR, PP-ASEL Mail: aa4lr@radio.org Quote: "Not in a thousand