[RTTY] Heathkit SB-1000 On RTTY

[Joe Subich, W4TV]

> The manual for the Heathkit SB-1000 says a maximum plate current of
> 400 mA for CW and 550 mA on SSB.

The Heathkit manual rating is significantly in excess of Eimac's own
*MAXIMUM* PEP value for SSB.  Eimac states 400 mA for both CW and SSB.

 > What would be a safe maximum plate current for RTTY operation,

Given the continuous carrier nature of RTTY, the safe value would be
275 mA as given in the Eimac data sheet for "carrier conditions" in
AM operation.  This is particularly important since the 3-500 is rated
for only 330 plate dissipation in plate modulated AM (constant carrier)
service and Heath's cooling is inferior to the Eimac system.

73,

    ... Joe, W4TV


On 9/24/2012 10:30 AM, Thomas F Giella NZ4O wrote:
> I have a Heathkit SB-1000 amplifier with the single 3-500Z. The manual for the Heathkit SB-1000 says a maximum plate current of 400 mA for CW and 550 mA on SSB.
>
> What would be a safe maximum plate current for RTTY operation, which is obviously 100% duty cycle like AM operation?
>
> 73 & GUD DX,
> Thomas F. Giella NZ4O
> Lakeland, FL, USA
> nz4o at tampabay.rr.com
>
> NZ4O Amateur Radio & SWL Autobiography: http://www.nz4o.com
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