Reply
 
LinkBack Thread Tools Search this Thread Display Modes
  #1   Report Post  
Old March 9th 05, 09:57 PM
J M Noeding
 
Posts: n/a
Default

On Mon, 07 Mar 2005 22:16:01 -0500, Ken Scharf
wrote:

gudmundur wrote:
This is on a 10 gig receive setup. There is no LNFE, just antenna
to mixer direct couple in a balanced waveguide mixer assembly.
The question is, if I remove the 1N23E/1N23ER pair, and go with a
balanced set of schottkey microwave diodes, this would allow me to
drop my local oscillator injection perhaps 6db. Will I see any
increased sensativity, or should I just keep the 1N23 setup?


wow, those 1N21/23 diodes are stone age! They are Germanium diodes
and usually have to be biased for lowest noise, best conversion
figure. Also when used in cavities, the diode itself forms part
of the coupling network. The letter in the diode part is a measure
of noise figure, the higher up in the alphabet you go, the lower
the rated noise figure. BTW those diodes a dated from the
1940's!


when the devices were too old, they couldn't use them, and called them
1N451(?), and had modern diodes for another 50 years


---
J. M. Noeding, LA8AK, N-4623 Kristiansand
http://home.online.no/~la8ak/c.htm
Reply
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules

Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
The FAQ (Well, Question 1, at least) Airy R.Bean Homebrew 20 February 22nd 05 08:04 PM
Interesting question JAMES HAMPTON CB 3 December 7th 04 10:34 AM
Question Pool vs Book Larnin' Mike Coslo Policy 24 July 22nd 04 06:50 AM
BPL Video On-Line JJ Policy 31 August 17th 03 10:12 PM
Question regarding police tactics and scanners noobie Scanner 0 July 29th 03 01:48 AM


All times are GMT +1. The time now is 05:14 AM.

Powered by vBulletin® Copyright ©2000 - 2025, Jelsoft Enterprises Ltd.
Copyright ©2004-2025 RadioBanter.
The comments are property of their posters.
 

About Us

"It's about Radio"

 

Copyright © 2017