The AM Forum
March 18, 2024, 09:58:59 PM *
Welcome, Guest. Please login or register.

Login with username, password and session length
 
   Home   Help Calendar Links Staff List Gallery Login Register  
Pages: [1]   Go Down
  Print  
Author Topic: Johnson 500 softstart  (Read 7194 times)
0 Members and 1 Guest are viewing this topic.
N3DAN
Guest
« on: January 14, 2005, 06:45:24 AM »

Does anyone have info on HV softstart for the Johnson viking 500??  I seem to remember an article that came out awhile back but can't find it.  73.  Paul
Logged
WA1HZK
Member

Offline Offline

Posts: 1104


WWW
« Reply #1 on: January 16, 2005, 06:37:36 PM »

I added a 25 amp relay that shorts out a 10 ohm 50 watt resistor. This is rigged in the primary feed of the plate transformer. I key a 28 volt DC supply that Keys the DC coil of the new relay on PTT. Rig a resistor in series with the DC to the coil and a fat cap. across the coil. When I key the rig I'm looking for a 1/2 second delay on the new relay shorting the 50 watt resistor that is in the primary of the plate transformer. Pick the RC to work with your relay. Also, 28 volts DC is a great keying voltage to have in the transmitter because all of your 110 VAC relays will work on 28 VDC also! This will also give you some release delay in the new relay  when unkeying but at that point there is no primary current flowing so it's not a problem.
Keith
WA1HZK
Logged

AM is Not A Hobby - It's a "Way of Life"!
Timmy, Sometime in 2007 on a Mountain Far Away..
www.criticalradio.com
www.criticalbattery.com
www.criticaltowers.com
www.criticalresponder.com
Official Registered "Old Buzzard"
N3DAN
Guest
« Reply #2 on: January 18, 2005, 10:00:37 AM »

Keith - thanks for the info.  73  _Paul
Logged
Pages: [1]   Go Up
  Print  
 
Jump to:  

AMfone - Dedicated to Amplitude Modulation on the Amateur Radio Bands
 AMfone © 2001-2015
Powered by SMF 1.1.21 | SMF © 2015, Simple Machines
Page created in 0.047 seconds with 19 queries.