"David" wrote in message
...
Tam,

I believe you are correct. The 147nH inductor is the largest "can" that I
have. The inductor really needs to be larger to get the loaded Q of the
match down for this ration of impedance transform.

When trying 50 Ohms to 800 Ohms (instead of the original 4500 Ohms), the
match works. The actual loaded Q was about 8.

Seems a good rule of thumb would be to go for loaded Q around 10% of
unloaded Q.

Thanks

David,

The inductor loss is (LoadedQ)/(UnloadedQ). So for your numbers of 26 and
50, the loss will be 0.52, or about 3 DB. I think you will want to look at a
different configuration. Either something that puts a very small cap in
series with the 4500w||2.5PF, or go for something like a 2 uH inductor in
parallel with it. At 45 MHz you need an LC product of 12.5 to resonate; this
will then be inductive. Tune and match off a tap of the inductor with 2
capacitors.

Tam