I know about the wattmeter Dave. I'm using a Powermaster.
I actually answered my own question. The grid current being half of what it
shows on the meter. So with my setup, the grid current is actually only
about 25 ma which is about right.
Thanks
73
Merry Christmas!
Jim W7RY
--------------------------------------------------
From: "Dave Hachadorian" <k6ll@arrl.net>
Sent: Thursday, December 23, 2010 1:24 PM
To: "Jim W7RY" <w7ry@inbox.com>; <amps@contesting.com>
Subject: Re: [Amps] AL-1500 Plate Meter Circuit
> Page 9 of the instructions says, "The final grid current should be around
> 50 mA and the plate current below 1000 mA."
>
> By the way, the power output meter in the AL-1500 is not a real wattmeter,
> and can be quite inaccurate.
>
>
> Dave Hachadorian, K6LL
> Yuma, AZ
>
>
>
> -----Original Message-----
> From: Jim W7RY
> Sent: Thursday, December 23, 2010 2:07 PM
> To: Jim W7RY ; AMPS
> Subject: Re: [Amps] AL-1500 Plate Meter Circuit
>
> Looking a little closer at the schematic, R3 and R4 are grid meter
> resistors. The grid current is very low about 50 ma for 1500 watts out.
>
> Thanks
> 73
> Jim W7RY
>
>
>
> --------------------------------------------------
> From: "Jim W7RY" <w7ry@inbox.com>
> Sent: Thursday, December 23, 2010 1:04 PM
> To: "AMPS" <amps@contesting.com>
> Subject: [Amps] AL-1500 Plate Meter Circuit
>
>> Merry Christmas!
>> I'm working on a AL-1500. I noticed that the is only one 1.5 Ohm resistor
>> in the plate metering circuit. The schematic calls for two 1.5 Ohm
>> resistors (R3 and R4).
>>
>> The plate current seems just a bit high. With 1500 watts out, plate
>> current is about 975 ma @ 2900 volts. I really believe the amp is a bit
>> more efficient than this.
>>
>> Ideas?
>> Thanks
>> 73
>> Jim W7RY
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>>
>>
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