[AMPS] A new question GI7b in GG conf.
Peter Frenning, OZ1PIF
oz1pif@get2net.dk
Thu, 12 Oct 2000 20:10:15 +0200
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Hi everybody,
I have a GI7b (Russian triode, 350W, 3 GHz) which I use in a 144MHz GG =
amp.
I'm thinking about swamping the cathode with some resistors, in order =
to:=20
a) lessen the risk of higher freq. parasitics! and=20
b) raise the drive requirements somewhat (currently ~25W for full =
output) to 50W=20
(cause this is what my tranceiver will output)
I figure that I'll need somewhere between 100 and 800 Ohms to achieve =
the goal,=20
I guess I'll have to experiment to find the most suitable value.
Any comments on the merits of such a modification?
Did I really step in it asking this?
Vy 73 de OZ1PIF, Peter
For the latest news on the EME/Terrestrial VHF/UHF/HF DXpedition to =
Greenland go to:
http://www.qsl.net/ox2k
Sound clips from OX2K operation "off the air": =
http://hjem.get2net.dk/oz1pif/OX2K-sound.htm
********** OZ1PIF **************
email: oz1pif(no-spam-filler)@get2net.dk
http://hjem.get2net.dk/oz1pif
Shack Ph. +45 4619 3208
Snailmail:
Peter Frenning
Ternevej 23
DK-4130 Viby Sj.
Denmark
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<DIV><FONT size=3D2>Hi everybody,</FONT></DIV>
<DIV> </DIV>
<DIV><FONT size=3D2>I have a GI7b (Russian triode, 350W, 3 GHz) which I =
use in a=20
144MHz GG amp.</FONT></DIV>
<DIV> </DIV>
<DIV><FONT size=3D2>I'm thinking about swamping the cathode with some =
resistors,=20
in order to: </FONT></DIV>
<DIV><FONT size=3D2>a) lessen the risk of higher freq. parasitics! and=20
</FONT></DIV>
<DIV><FONT size=3D2>b) raise the drive requirements somewhat (currently =
~25W for=20
full output) to 50W </FONT></DIV>
<DIV><FONT size=3D2>(cause this is what my tranceiver will =
output)</FONT></DIV>
<DIV> </DIV>
<DIV><FONT size=3D2>I figure that I'll need somewhere between 100 and =
800 Ohms to=20
achieve the goal, </FONT></DIV>
<DIV><FONT size=3D2>I guess I'll have to experiment to find the most =
suitable=20
value.</FONT></DIV>
<DIV> </DIV>
<DIV><FONT size=3D2>Any comments on the merits of such a=20
modification?</FONT></DIV>
<DIV> </DIV>
<DIV><FONT size=3D2>Did I really step in it asking this?</FONT></DIV>
<DIV> </DIV>
<DIV><FONT size=3D2>Vy 73 de OZ1PIF, Peter</FONT></DIV>
<DIV> </DIV>
<DIV><FONT size=3D2>For the latest news on the EME/Terrestrial =
VHF/UHF/HF=20
DXpedition to Greenland go to:<BR><A=20
href=3D"http://www.qsl.net/ox2k">http://www.qsl.net/ox2k</A><BR>Sound =
clips from=20
OX2K operation "off the air": <A=20
href=3D"http://hjem.get2net.dk/oz1pif/OX2K-sound.htm">http://hjem.get2net=
.dk/oz1pif/OX2K-sound.htm</A></FONT></DIV>
<DIV> </DIV>
<DIV><FONT size=3D2>********** OZ1PIF **************<BR>email:=20
oz1pif(no-spam-filler)@get2net.dk<BR><A=20
href=3D"http://hjem.get2net.dk/oz1pif">http://hjem.get2net.dk/oz1pif</A><=
BR>Shack=20
Ph. +45 4619 3208<BR>Snailmail:<BR>Peter Frenning<BR>Ternevej =
23<BR>DK-4130 Viby=20
Sj.<BR>Denmark<BR>***********************************</FONT></DIV></BODY>=
</HTML>
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