Call Search
     

New to Ham Radio?
My Profile

Community
Articles
Forums
News
Reviews
Friends Remembered
Strays
Survey Question

Operating
Contesting
DX Cluster Spots
Propagation

Resources
Calendar
Classifieds
Ham Exams
Ham Links
List Archives
News Articles
Product Reviews
QSL Managers

Site Info
eHam Help (FAQ)
Support the site
The eHam Team
Advertising Info
Vision Statement
About eHam.net

   Home   Help Search  
Pages: [1]   Go Down
  Print  
Author Topic: Optimizing my new HBR-11 receiver  (Read 622 times)
KC9KEP
Member

Posts: 208


WWW

Ignore
« on: May 13, 2009, 12:15:41 PM »

Hello all!

I'm just finishing my HBR-11 (Ted Crosby April '63 QST) receiver.

http://www.bignick.net/HBR_11/7.jpg
http://www.bignick.net/HBR_11/5.jpg
http://www.bignick.net/HBR_11/4.jpg

Can anyone advise on how to start to quantitatively characterize this (or any other receiver's) performance?

I would assume that the two major measurements would characterize sensitivity and selectivity.

I do have a sweep generator that I could use for the I.F. strip to see how steep the skirts of the filtering are.

And, I would assume that one would need a "calibrated" RF source in order to find the uV at which the received signal drops out?

Are there some recommended sources of text/discussions for such analysis somewhere?

Thank you all!

73

--Big Nick AKA Tom Nickel AKA KC9KEP
Logged
KA5N
Member

Posts: 4380




Ignore
« Reply #1 on: May 14, 2009, 08:17:00 AM »

Download the ARRL Lab Test Procedures Manual (ARRL web site under "services" then technical info.  This 157 page opus explains how ARRL tests new transceivers and receivers.  
Consider that it requires quite a bit of high quality equipment, knowledge and skill to really "quantitively" characterize a receiver, you may wish to settle for a simplified set of tests.
Anyway the ARRL manual should give you a good start with your endeavor.
Allen
Logged
W6VPS
Member

Posts: 369




Ignore
« Reply #2 on: May 14, 2009, 08:26:36 AM »

Damn fine job. It looks super. If it works half as good as it looks....WOW...you've got a winner.

Very nicely done sir.  Who says home brew is dead?

73
Paul/W6VPS

Logged
AA4PB
Member

Posts: 12840




Ignore
« Reply #3 on: May 14, 2009, 09:15:49 AM »

Here's some good info including some older receiver measurements. Note the link to a page explaining how to make the measurements.

http://www.w1vd.com/BAreceivertest.html
Logged
WA2ONH
Member

Posts: 253




Ignore
« Reply #4 on: May 14, 2009, 10:42:02 AM »

Tom

I came across the K5BCQ HBR Receiver Web Site noting info on ?

"These are the tube type HBR-14, HBR-16, HBR-8, HBR-11, HBR-12, and HBR-13C receivers originally published in QST. Parts, and sometimes-entire receivers, can be found at swap fests, on e-Bay, and through the various Internet reflectors. There is an HBR Receiver reflector on Allan Waller's qsl.net server. The HBR Receiver Web Site has an abundance of information for those interested and details on how to join the HBR reflector. The "Hints & Kinks and Construction Notes" section includes useful data, applicable to ANY tube equipment."

The GoTo LINK is http://www.qsl.net/k5bcq/HBR/hbr.html

Good Luck

73 de WA2ONH Charlie
Logged

73 de WA2ONH dit dit    ...Charlie
----------------------------------------------------------------------------
"No time is ever wasted that is spent LEARNING something!"
K8AC
Member

Posts: 1472




Ignore
« Reply #5 on: May 20, 2009, 05:03:42 AM »

Haven't used an HBR-11, but did build an HBR-16 a long time ago.  With the IF transformers peaked, I found that the passband was too narrow for SSB (and AM of course).  I had to stagger-tune the IFs to get a usable passband width.  That wasn't a problem as there was plenty of IF gain.  If would be interesting to know if you see this same problem.
Logged
Pages: [1]   Go Up
  Print  
 
Jump to:  

Powered by MySQL Powered by PHP Powered by SMF 1.1.11 | SMF © 2006-2009, Simple Machines LLC Valid XHTML 1.0! Valid CSS!