23cm LNA from Ucraine

Pavel, US4ICI and his team from vhfdesign.com are building a nice preamp for 23cm. Details can be found here: http://en.vhfdesign.com/lna/lna-for-23cm-mmic-sky67151.html

It is doing a nice job:

23cm LNA

Passband with filtercurve from the ceramic filter, quite good input return loss

good suppression on 70cm

Noise figure measurement with HP 346B and Eaton 2075, with 10dB attenuator in front of the LNA its a bit worse abt. 0.5-0.6dB (for unknown reason)

because the preamp is going to be used for tropo the second stage was removed, the gain is now lower

its now 22dB @ 80mA

Result May 2015

CallSign   : DM3F
Contest    : May 2015
Date       : 2015/05/02
QTH        :

WW Locator : JO60OM

A.S.L.     : 900 m
Band       : 432 MHz
Category   : Single op
LOG        : Atalanta Locator ver. 12.23

at 1:34 DM3F audio


Nr of QSO  : 171
- Dupe's   : 0
- Bug's    : 0
------------
Valid QSO  : 171

Sum of pts.: 48 805
ODX        : YU1LA in KN04FR at 842 km

Certificate March UHF Contest 2015