[Elecraft] K1 Flickering ATTN LED

[Mike Morrow]

Rich wrote:

> I recently completed building a K1 and have made several contacts.  I'm
> still learning the radio and noticed that when I change the LCD display
> from normal (nor) to voltmeter (bat) the ATTN LED dimly and rapidly
> flickers...
>  
> Can I just ignore this or does it warrant further investigation?

It's completely normal.

The best technical explanation was given by Don Brown in a posting
made here on 02 December 2002:

> ... The DVM and and ATTN light use the same pin on the MPU so the
> ATTN light will flicker when the MPU reprograms the pin as an input
> so it can read the battery voltage. Then changes it back to an output
> to drive the ATTN circuit.  The time needed to read the battery
> voltage is very short but long enough to make the ATTN light flicker.

The K1 is a fantastic little radio.  Mine is number 175, November 2000,
and it is still my favorite after almost 13 years.

73,
Mike / KK5F