[Elecraft] K1 DC voltage check

Don Wilhelm w3fpr at embarqmail.com
Sat Feb 27 15:23:12 EST 2016


"not drastically" was what was used - trying to mean 'very little'.

73,
Don W3FPR

On 2/27/2016 3:12 PM, Mark Petrovic wrote:
> Thank you, Don.
>
> What does drastically mean in this context?
>
>> On Feb 27, 2016, at 11:59 AM, Don Wilhelm <w3fpr at embarqmail.com> wrote:
>>
>> Mark,
>>
>> You are effectively reading the voltage drop across D16.
>> That 600mV drop across D16 will not drastically affect the operation of the K1.
>> If you would like a bit higher voltage on the PA transistor, you can increase the voltage of your power supply a bit (the K1 upper voltage spec is 15 volts).  If you are running on batteries, it will make a little difference.
>> If you would like a lower voltage drop across D16, replace it with a 95SQ015 which is available from Elecraft as p/n E560009 (it is used in the K2 as the series reverse voltage protection diode.
>>
>> 73,
>> Don W3FPR
>>
>>> On 2/27/2016 2:32 PM, Mark Petrovic wrote:
>>> I'm performing the DC voltage checks (page 30 of the instructions), which occur immediately after installing the power switch on the RF board.
>>>
>>> P1 pin 16 is supposed to be supply minus 300mV, but I get 600mV.  Is this a cause for concern?



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