Re: HI CUR and 160 Meters
Posted by
John Huffman-2 on
Nov 23, 2006; 1:31am
URL: http://elecraft.85.s1.nabble.com/HI-CUR-and-160-Meters-tp441148p441150.html
Don -
Yup, looks like a power supply issue.
K2 Meter V I
Receive 13.7 0.34
12 watts 12.6 2.78
13 watts 11.8 4.38
14+ watts 11.3 5.10
Making up a heftier cord to the power supply should do the trick.
Many thanks!
73 de K1ESE
John
Don Wilhelm wrote:
> John,
>
> How much power is actually being produced? What does the K2 meter indicate
> in TUNE?
> What is your power supply voltage under this 4.5 amp load? If the voltage
> drops significantly, the current will go up - the K2 tries to provide the
> requested power out, and if the voltage drops, the current must increase.
>
> If you can eliminate power supply voltage drop problems, then you could have
> some sort of oscillation present. The K2 is quite stable if all the
> components are correct. You could start by checking T1, T2 and T4
> (especially T4). The only other thing that I can think of right now are the
> components in the base circuit of Q7 and Q8, but I cannot relate to a jump
> in current draw if those components were at fault.
>
> Check th evoltage on the base of Q7 and Q8 when transmitting - it should be
> 0.6 volts or very close.
>
> 73,
> Don W3FPR
>
>> -----Original Message-----
>>
>> While waiting for parts to fix my KPA100 and KAT100, I was checking out
>> my K160RX.
>>
>> The situation is that at 12W out the K2 (KSB2, KNB2, KDSP2, K106RX,
>> KIO2) draws 2.5 amps. With power set at anything above that, it exceeds
>> 4.5 amps and I get a Hi CUR warning (limit set at 4.5 amps).
>>
>> Current is a bit higher than expected on 80 meters at 3.2 amps max
>> output. Other bands 2.9 - 2.9 amps.
>>
>> I wonder what would cause the jump?
>>
>> 73 de K1ESE
>> John
>>
>
>
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