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: FLdigi CW  (Read 3151 times)
AJ8MH
Member

Posts: 120


WWW

Ignore
« on: September 22, 2012, 06:37:50 PM »

I'm wanting to use an LM567 decoder chip to drive a relay to key my transmitter when 600 Hz audio is detected from FLdigi.  I know you can get PTT from the com port, but has anyone tried the decoder route?  If so, have you noticed any delay keying the transmitter?  Any other issues?

Thanks,
Joe
Logged
JAHAM2BE
Member

Posts: 277


WWW

Ignore
« Reply #1 on: September 22, 2012, 10:11:08 PM »

I'm wanting to use an LM567 decoder chip to drive a relay to key my transmitter when 600 Hz audio is detected from FLdigi.  I know you can get PTT from the com port, but has anyone tried the decoder route?  If so, have you noticed any delay keying the transmitter?  Any other issues?

Is there any reason the transistor circuit proposed in the FLdigi documentation won't work for you?

http://www.w1hkj.com/FldigiHelp-3.20/CWkeying.html

That circuit is on my short list of upcoming projects to build.
Logged

PA0BLAH
Member

Posts: 0




Ignore
« Reply #2 on: September 23, 2012, 03:43:45 AM »

Any other issues?

Thanks,
Joe

Joe, when the circuit locks there is a kind of bouncing at the open collector output, fast switching a number of times between OC and grd. So kind of debouncing after the circuit is probably required. That introduces a delay in the output.
So that may be an issue.

gd luck Bob
Logged
AJ8MH
Member

Posts: 120


WWW

Ignore
« Reply #3 on: September 23, 2012, 06:25:56 AM »

Is there any reason the transistor circuit proposed in the FLdigi documentation won't work for you?
I'm using line-level out of the computer and can't get enough drive to switch the transistor.  I played with the circuit yesterday, but haven't given up, yet.
Logged
AJ8MH
Member

Posts: 120


WWW

Ignore
« Reply #4 on: September 23, 2012, 06:28:37 AM »

...debouncing after the circuit is probably required.
I'll keep that in mind if I go that route.  Thanks!
Logged
AJ8MH
Member

Posts: 120


WWW

Ignore
« Reply #5 on: September 23, 2012, 09:19:49 AM »

Today, after some sleep, I got the FLdigi published circuit working on the breadboard.  Seems I had FLdigi up all the way, but my sound card was only half way up.  Operator error!  Thanks for your help.
Logged
PA0BLAH
Member

Posts: 0




Ignore
« Reply #6 on: September 24, 2012, 07:24:26 AM »

Today, after some sleep, I got the FLdigi published circuit working on the breadboard.  Seems I had FLdigi up all the way, but my sound card was only half way up.  Operator error!  Thanks for your help.

OK congrats, must be, I watched the schematic of which  the link was given, and that must do what it is intended for. If not your isolation transformer is not 1:1 and interchanging primary and secondary should work.

Bob
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!