The AM Forum
March 28, 2024, 05:35:24 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: Henry 2k  (Read 1950 times)
0 Members and 1 Guest are viewing this topic.
wd0cfc
Guest
« on: May 03, 2013, 10:20:59 AM »

Ok ive been busy cleaning it up . How do i check the tuned input with no voltage like close the relay and what resistor to make it look like the tubes are there ? I was cleaning and didnt reliaze the lil shaft turned so easy ugh.


* 100_4097.JPG (1283.63 KB, 2576x1932 - viewed 393 times.)

* 100_4099.JPG (1276.18 KB, 2576x1932 - viewed 391 times.)

* 100_4101.JPG (1282.62 KB, 2576x1932 - viewed 397 times.)
Logged
W3RSW
Contributing
Member
*
Offline Offline

Posts: 3308


Rick & "Roosevelt"


« Reply #1 on: May 04, 2013, 07:54:59 PM »

A single 3-500z input impedance is roughly 100 ohms but there is no cookbook approach to this without understanding.  Two tubes in parallel should present  approx. 50 ohms. First try 50 ohms in and 50 ohms out and feed with fairly low level.  Or feed network at a watt or so from your transmitter into a 50 ohm load. You will need loaded fully loaded currents and voltages to make it optimum.

But read stuff like this http://www.w8ji.com/tuned_input_circuit.htm to understand what is going on.

You are dealing with a dynamic system so the Heath designer in the reference had some very germain experience
Logged

RICK  *W3RSW*
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 0.065 seconds with 18 queries.