[Johnson] Attenuators

[Kenneth D. Grimm, K4XL]

Mark W1EOF wrote:
> Talking about attenuators... I just got a 250-34 Power Divider.
>
> Where is that described (In what manual, I know how to use BAMA)?
>
> How many different attenuators are there?
>
> 73,
>
> Mark W1EOF
>

The 250-34 was a "Power Divider" for use with the Johnson Viking 
"Kilowatt."  The description, from the 1961 catalog reads as follows:  
"The Johnson Power Divider is completely shielded and will provide up to 
35 watts continuous dissipation for proper output loading of 50 to 75 
watt output transmitters when used to drive the Viking "Kilowatt."  A 
3-position switch located at one end of the unit permits the maximum, 
medium and zero steps of attenuation to be selected in the power 
divider.  Two SO-239 coaxial connectors are located at the other end for 
the input and output coaxial lines.  A perforated 3-sided cover provides 
ventilation for dissipating resistor heat."  Size and weight are given 
along with the list price of $25.50.

Additionally, the Johnson catalog lists two "Attenuators"  for use with 
the Thunderbolt.  The 250-42-1 for the Ranger and with the addition of a 
light bulb, the Viking II or similar sized transmitters.  The 250-42-3 
was for the Hallicrafters HT-32 class of transmitters.  Complete 
descriptions of these are in the Johnson catalog and plans for their 
construction are in the Thunderbolt manual.

73,

-- 

Ken K4XL
k4xl at arrl.net

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