Amps
[Top] [All Lists]

[AMPS] 4 by 10 inp Z ?

To: <amps@contesting.com>
Subject: [AMPS] 4 by 10 inp Z ?
From: measures@vc.net (Rich Measures)
Date: Thu, 22 Jan 98 08:17:42 -0800
>
>Cathode inp Z should be in the 100 - 150 ohm region but
>if anyone has a more exact figure I would like to know.

My guess is a bit under 100 ohms.  1500w should drive it to the rated 
anode current.  However, if you use a 450 ohm terminating resistor at the 
grid, and drive the 4 by 10 at the grid instead of the cathode, c. 150w 
will drive it to the rated anode current. .  .   A diagram of such a grid 
circuit is available at my Web site:
www.vcnet.com/measures
see Figure 5  .  .   An ideal grid roller L for the 4 by 10 is currently 
being sold by Fair Radio Sales 419-227-6573.  Ask for the 5uH unit out of 
the Collins 180T.  The price is $10 for this little beauty.    Below 
6.2MHz the grid roller L can either be switched out, or a suitable fixed 
inductance added with a switch.    .  .  Typical power gain is 20db.      
                                                                          
                                                                          
                                                                          
                                                                          
                                                                          
                                                                          
                                                                          
                                                                          
                
cheers,  Jim
Rich...

R. L. Measures, 805-386-3734, AG6K   


--
FAQ on WWW:               http://www.contesting.com/ampfaq.html
Submissions:              amps@contesting.com
Administrative requests:  amps-REQUEST@contesting.com
Problems:                 owner-amps@contesting.com
Search:                   http://www.contesting.com/km9p/search.htm

<Prev in Thread] Current Thread [Next in Thread>