[AMRadio] Valiant carrier...

[Jim Wilhite]

Rick, Johnson put ~600 volts on the plate of the Valiant and Viking 
series radios which is for Continuous Carrier operation.  Then with 330 
Ma. you get input of 198 watts and the best output I have ever seen from 
a Valiant is ~120 watts, which is about 60%.

The DX 100 radio has just two 6146s and gave the same power output. 
They put about 800 volts on the final which is Intermittent service.  I 
believe you will find that 70% figure is under certain circumstance you 
may not have in the Johnson, or for that matter in the Heath.

Jim/W5JO


----- Original Message ----- 



>I agree, 75% should be possible and I hope I'm able to get there.
> Rick / K5IAR
>
> From: amradio-bounces at mailman.qth.net
> [mailto:amradio-bounces at mailman.qth.net] On Behalf Of Ron Youvan
> Sent: Wednesday, June 15, 2011 2:25 PM
> To: Discussion of AM Radio in the Amateur Service
> Subject: Re: [AMRadio] Valiant carrier...
>
>   I don't know the Valiant, but 75% using class "C" should not be a
> problem, but 400 Watts PEP from three 6146s seems a bit of a stretch.
> I think you are going to need between 800 and 900 Volts on the plates 
> to
> maximize the power output to do it.
> -- 
>    Ron  KA4INM -
>