4335Re: [loopantennas] Re: Balanced Antenna Amplifiers
- Nov 30, 2007
>I have rewritten the JFET evaluation that I posted earlier this month,
> the noise is slightly better with the U310 but only
> slightly than the J310h at 450 MHz the delta is about
> 0.3 dB nothing to write home about!
> Chris may know other variables that could be better
> Also, I notice Dallas Lankford tends to use these U310
> JFETs over the J310 JFETs and I don't know why!
more than doubling the number of devices evaluated and with some morte
I was fortunate in obrtaining a number of 2N4416's for this exercise, as
well as a single U310 in a TO-18 package. That's a curious device, as the
gate is connected to the case. Not at all surprising, as that entire family
of devices was very popular as common-gate amplifiers for CATV applications.
,----------------------. High Performance Mixers and
/ What's all this \ Amplifiers for RF Communications
/ extinct stuff, anyhow? /
\ _______,--------------' Chris Trask / N7ZWY
_ |/ Principal Engineer
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