[hpsdr] Munin total current??

[Kjell Karlsen]

Hi John.

On the bands up to 10 meter, I normally see around 17-18 A when driving it  
up to 100W and a single frequency. On 6 meter, the current may go higher  
due to lower efficiency.

The readings on J3 is not accurate but I have never seen them vary. I use  
a Fluke DVM.

I do not know the Boonton 91C so to tell how good your measuring equipment  
are, is difficult.

73, Kjell



På Wed, 29 Jan 2014 15:34:57 +0100, skrev John <radio at mediacombb.net>:

> ***** High Performance Software Defined Radio Discussion List *****
>
>
> Hi George,
>
> I used a signal generator to drive my Munin.  The output of Munin was  
> fed to a 30 dB attenuator and the voltage was measured with a Boonton  
> 91C millivoltmeter.  Total current to Munin was indirectly measured  
> using a 100mA/10 A current shunt and an old Fairchild 7000 DVM.   
> Unfortunately, I do not know the accuracy of my test equipment.
>
> The total current to Munin was measured at 50, 60, 70, and 80 Watts  
> output.   This was done for the amateur bands at 100 kHz intervals, up  
> to 50.2 mHz.
>
> The voltage at J3-1 was measured, but some of the readings did not make  
> sense on the higher frequencies.  Later, some checks were made and it  
> was discovered the was AC voltage on this line at higher power levels.   
> This may or may not be RF voltage.  I measured it with an HP-3400A  
> (rated to only 10 mHz).  Changing the position of the wires to J3  
> reduced it from 0.5 Volts to about 100 mV or so.
>
> On six meters the total Munin current was measured to be a little over  
> 20 Amperes (for 80 Watts output measured on my test setup).
>
> My Munin has the modification to C25, 26,and 27.
>
> You mentioned your Munin went up to about 18 Amps when playing around.   
> How were you able to reduce the current?
>
> 73,
>
> John,  WoGN
>
>
> At 05:34 AM 1/16/2014, Georg Prinz wrote:
>> Hi John,
>>
>> my Munin takes about 12A when in resonance. When playing around it went
>> up to more or less 18Amps.
>>
>> 73, Georg, dl2kp
>>
>>
>>
>>
>> Am Donnerstag, den 16.01.2014, 04:46 -0600 schrieb John:
>> > ***** High Performance Software Defined Radio Discussion List *****
>> >
>> >
>> >
>> > What is the maximum current drawn by Munin?  I plan to use 13.6 VDC
>> > and want to add a meter on my Munin.
>> >
>> > 73,
>> >
>> > John,  WoGN
>
>
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