[Elecraft] K1B80 Kit

[Don Wilhelm]

I am sometimes asked if 80 meters can be added to the 4 band board, and 
the answer is not without sacrificing two of the 4 bands - making it a 3 
band board.

The low pass filters are shared for two bands each - that works for 40 
and 30 meters, and also for 20 and either 17 or 15 meters.
But it will not work for 80 meters because the 2nd harmonic will be in 
the 40 meter band vicinity and will not be suppressed.
Besides, it would require a lot of experimentation to get the Pre-mixer 
and RF Bandpass filters at the correct frequency.

73,
Don W3FPR

On 10/21/2017 3:20 PM, CN8YR wrote:
> ​Thanks Don for info.
> 
> I didn't pay attention to this restriction at the time;​
> 
> 73, Med CN8YR
> 
> 
> 2017-10-21 19:53 GMT+01:00 Don Wilhelm <donwilh at embarqmail.com>:
> 
>> Med,
>>
>> The K1B80 kit cannot be used on the 4 band board, it is only for the 2
>> band board.
>>
>> The K1 manual contains instructions for the 2 band board, and the chart of
>> capacitors and inductors to use for each band is on the page following page
>> 6 of the RF Board Parts List.
>>
>> 73,
>> Don W3FPR
>>
>>
>> On 10/21/2017 2:38 PM, CN8YR wrote:
>>
>>> Hello dear All,
>>> I made a four bands K1 5 years ago, and ordered also at that time a K1B80
>>> Kit but didn't assembl it.
>>> I lost assembly instruction of that 80m kit.
>>> Does anyone have a copy of that manual?
>>>
>>
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