TopBand: 2N5109 PREAMPS

[BILL MCHUGH]

There were a few posts a week or so ago about using the 2N5109 as a
preamp for Beverage and other receive antennas.

October, 1976 issue of HAM RADIO MAGAZINE has a schematic with parts
list for such a unit.  This design is broadband, and I would think it
would be very desireable to place a filter and tuned circuit at the
input.

The specs are very interesting: 3 db NF @ 200 mhz; gain of 11 db from
50-216 mhz; and cross-modulation distortion of -70db.  Used in earlier
TV preamps, this device is still available for very low cost.

For a bandpass filter which can be used ahead of this preamp, refer to a
good article by W7ZOI in HAM RADIO MAGAZINE, February, 1975.

Bill, VE3CSK

--
FAQ on WWW:               http://www.contesting.com/topband.html
Submissions:              topband@contesting.com
Administrative requests:  topband-REQUEST@contesting.com
Problems:                 owner-topband@contesting.com