Reply
 
LinkBack Thread Tools Search this Thread Display Modes
  #1   Report Post  
Old March 25th 08, 04:13 PM posted to rec.radio.amateur.homebrew
external usenet poster
 
First recorded activity by RadioBanter: Nov 2006
Posts: 13
Default MC1350 - Low noise replacement?

Hello,

I'm looking for an IF amp (w/agc and 50db max gain is ample) to use as a
replacement for an MC1350. Main reason is noise reduction. Doesn't
necessarily need be in 8-pin dip package, however, not enough room for an
entirely built-up amp.

Suggestions appreciated.

Thanks,
Emil


  #2   Report Post  
Old March 26th 08, 07:15 AM posted to rec.radio.amateur.homebrew
external usenet poster
 
First recorded activity by RadioBanter: Jul 2006
Posts: 644
Default MC1350 - Low noise replacement?

On Mar 25, 8:13 am, "Sbc News" wrote:
Hello,

I'm looking for an IF amp (w/agc and 50db max gain is ample) to use as a
replacement for an MC1350. Main reason is noise reduction. Doesn't
necessarily need be in 8-pin dip package, however, not enough room for an
entirely built-up amp.

Suggestions appreciated.

Thanks,
Emil


You didn't mention what IF frequency...

I believe you'll find some nice VGAs (variable gain amplifiers) at
Analog Devices and probably at Linear Technology. TI is another good
bet. Some are digitally controlled, but I'm pretty sure I've seen
analog-controlled ones too. I've personally been using Linear
Technology's LTC6400-20. It's a fixed 20dB gain part with reasonably
good noise figure and low distortion, useful to a couple hundred MHz.
It's a tad power-hungry (the price you pay for low distortion) and in
a package you may find hard to deal with. But it's been one of the
easiest op amp based amplifiers in this class I've found to keep
stable.

Cheers,
Tom
  #3   Report Post  
Old March 26th 08, 02:49 PM posted to rec.radio.amateur.homebrew
external usenet poster
 
First recorded activity by RadioBanter: Nov 2006
Posts: 13
Default MC1350 - Low noise replacement?

Tom,
Thanks for the help. I'll check out your suggestions. The IF freq in my
application is ~5mhz.
Emil


"K7ITM" wrote in message
...
On Mar 25, 8:13 am, "Sbc News" wrote:
Hello,

I'm looking for an IF amp (w/agc and 50db max gain is ample) to use as a
replacement for an MC1350. Main reason is noise reduction. Doesn't
necessarily need be in 8-pin dip package, however, not enough room for an
entirely built-up amp.

Suggestions appreciated.

Thanks,
Emil


You didn't mention what IF frequency...

I believe you'll find some nice VGAs (variable gain amplifiers) at
Analog Devices and probably at Linear Technology. TI is another good
bet. Some are digitally controlled, but I'm pretty sure I've seen
analog-controlled ones too. I've personally been using Linear
Technology's LTC6400-20. It's a fixed 20dB gain part with reasonably
good noise figure and low distortion, useful to a couple hundred MHz.
It's a tad power-hungry (the price you pay for low distortion) and in
a package you may find hard to deal with. But it's been one of the
easiest op amp based amplifiers in this class I've found to keep
stable.

Cheers,
Tom



  #4   Report Post  
Old March 27th 08, 10:14 AM posted to rec.radio.amateur.homebrew
external usenet poster
 
First recorded activity by RadioBanter: Dec 2006
Posts: 117
Default MC1350 - Low noise replacement?

On Wed, 26 Mar 2008 13:49:14 +0000, Sbc News wrote:

The IF freq in my application is ~5mhz.


snip

Hi,

5MHz? There's opamps that can do 50dB at that frequency. Just another
option for you :-)

Cheers,
__
Gregg

  #5   Report Post  
Old May 2nd 08, 08:31 PM posted to rec.radio.amateur.homebrew
external usenet poster
 
First recorded activity by RadioBanter: May 2008
Posts: 1
Default MC1350 - Low noise replacement?

On Mar 25, 8:13 am, Emil wrote:
Hello,

I'm looking for an IF amp (w/agc and 50db max gain is ample) to use as a
replacement for an MC1350. Main reason is noise reduction. Doesn't
necessarily need be in 8-pin dip package, however, not enough room for an
entirely built-up amp.

Suggestions appreciated.

Thanks,
Emil


Analog Devices has the AD603 et al. From the AD603 datasheet:

"The AD603 is a low noise, voltage-controlled amplifier for use in RF
and IF AGC systems. It provides accurate, pin-selectable gains of -11
dB to +31 dB with a bandwidth of 90 MHz or +9 dB to 51+ dB with a
bandwidth of 9 MHz."

Bryan WA7PRC
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
MC1350 IC's [email protected] Homebrew 6 February 9th 07 06:36 PM
Shortwave Listening (SWL) Noise in Urban {Downtown) Location - Anti-Jammimg {Anti-Man-Made-Noise} Shortwave Antenna System RHF Shortwave 0 March 29th 06 05:25 AM
WTB: HP/Agilent 346A (or B) Noise Source for HP 8970A Noise Figure Meter Carl R. Stevenson Homebrew 0 January 21st 04 05:20 AM
Automatic RF noise cancellation and audio noise measurement JGBOYLES Antenna 25 August 11th 03 01:07 AM
Automatic RF noise cancellation and audio noise measurement Dave Shrader Homebrew 35 August 11th 03 01:07 AM


All times are GMT +1. The time now is 03:29 PM.

Powered by vBulletin® Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.
Copyright ©2004-2024 RadioBanter.
The comments are property of their posters.
 

About Us

"It's about Radio"

 

Copyright © 2017