JFK PA-338 board Roger Beep delay

A forum for the discussion of matters of a technical nature. All such activities are undertaken at the readers discretion and own risk. If you don't know what you are doing, don't blame us if it all goes wrong!
Post Reply
User avatar
13EL121
Radio Addict
Radio Addict
Posts: 618
Joined: 16 Sep 2008, 20:55
Call Sign: 13DA121
Location: Germany
Contact:

JFK PA-338 board Roger Beep delay

Post by 13EL121 »

Hi, any idea how to make the beep longer in a JFK with PA-338 board?
Thanks and 73,
Ralf
User avatar
dt307
Top Poster
Top Poster
Posts: 1250
Joined: 05 Sep 2014, 16:15
Call Sign: 163dt307

Re: JFK PA-338 board Roger Beep delay

Post by dt307 »

change value of c166
beep.jpg
schematic http://78roger.free.fr/president/schema/jfk(pc-338).jpg
You do not have the required permissions to view the files attached to this post.
163dt307-chris




“I fear the day that technology will surpass our human interaction. The world will have a generation of idiots.”
― Albert Einstein
User avatar
13EL121
Radio Addict
Radio Addict
Posts: 618
Joined: 16 Sep 2008, 20:55
Call Sign: 13DA121
Location: Germany
Contact:

Re: JFK PA-338 board Roger Beep delay

Post by 13EL121 »

:thumbup: Thank you Chris! Will give it a try.
User avatar
13EL121
Radio Addict
Radio Addict
Posts: 618
Joined: 16 Sep 2008, 20:55
Call Sign: 13DA121
Location: Germany
Contact:

Re: JFK PA-338 board Roger Beep delay

Post by 13EL121 »

Maybe it looks like C100 0.047? The schematic is not very clear.
User avatar
13EL121
Radio Addict
Radio Addict
Posts: 618
Joined: 16 Sep 2008, 20:55
Call Sign: 13DA121
Location: Germany
Contact:

Re: JFK PA-338 board Roger Beep delay

Post by 13EL121 »

Found it! C156 is the cap for Roger beep delay. Thanks for your help Chris! :thumbup:
User avatar
dt307
Top Poster
Top Poster
Posts: 1250
Joined: 05 Sep 2014, 16:15
Call Sign: 163dt307

Re: JFK PA-338 board Roger Beep delay

Post by dt307 »

all good happy to help ..... most have a cap in series with the beep on and off switch
163dt307-chris




“I fear the day that technology will surpass our human interaction. The world will have a generation of idiots.”
― Albert Einstein
User avatar
13EL121
Radio Addict
Radio Addict
Posts: 618
Joined: 16 Sep 2008, 20:55
Call Sign: 13DA121
Location: Germany
Contact:

Re: JFK PA-338 board Roger Beep delay

Post by 13EL121 »

Yes same as Superstar 360FM or 3900, but I was not able to find it in the schematic. You have seen what I have not seen... The beep switch in the schematic.
I doubled the value of the Tantal cap and the beep sounds like a Jackson now. :D
Post Reply