[Elecraft] Automatic 1:1/4:1 Balun switching under K3 control?

[James C. Hall, MD]

It could be that the relay could be switched by sending DC voltage up 
the coax, particularly if the balun is a good distance from the radio - 
much like turning on a pre-amp on the mast.

73, Jamie
WB4YDL



wayne burdick wrote:
> Leigh wrote:
>
>> This is great! I had been meaning to ask because I have use a 
>> switchable BL2 ony my big loop and had no way of knowing what the 
>> KAT3 was doing in the 1:1 and 4:1 positions, other than how long it 
>> took to find a match.
>
> This is certainly one excellent use of the KAT3's LCSET mode, Leigh.
>
> You've also given me an idea for a "BL3": Same as the BL2 but with a 
> relay rather than a switch for selecting 1:1 vs. 4:1. We could then 
> use one of the K3's spare output lines (say DIGOUT1) to switch the 
> relay under firmware control, per-band. There would be one wire 
> running from the AUX I/O connector to the BL3, and you'd need to power 
> the relay from the K3's switched 12 VDC accessory output.
>
> If this is of interest, I'll ask the BL2's designer to take a look at 
> it. I have the same problem myself, so I already want two :)
>
> 73,
> Wayne
> N6KR
>
>> On Thu, 20 Dec 2007 10:55 am, wayne burdick wrote:
>>>
>>> If you're ever curious about the actual L and C values used in the 
>>> matching network, you can check them using a special setting of the 
>>> KAT3 menu entry (in the CONFIG menu). Just set KAT3 to LCSET, then 
>>> exit the menu. Next, tap "ATU TUNE". This will display the present L 
>>> and C values.
>>
>>
>
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