[Elecraft] T1 build...

[Ross Primrose N4RP]

OK, so I finished the build yesterday, and today, after I built another 
BNC-PL259 cable so I could hook it up, I did the performance tests.  
Everything seems OK, except the transmit power display tests.  The T1 
shows the correct power level, but the K3 indicates at >10:1 SWR during 
the power measurement.  Bypass mode works fine, if I put the T1 in 
bypass and hit the tune switch on the K3 the dummy load gives a 1:1 SWR, 
it's only a problem when trying to display power....

Ideas?

73, Ross N4RP

On 3/4/11 2:26 PM, Don Wilhelm wrote:
>  Ross,
>
> You are looking too hard!  Most of the Elecraft tuners use the same 
> technique - the selected relay is activated and the return path flows 
> through all the rest of the other relay coils - there is not enough 
> current through any one coil to activate them, and it works quite well 
> - one more piece of "magic" that can be done using PICs.
>
> 73,
> Don W3FPR
>
> On 3/4/2011 1:30 PM, Ross Primrose N4RP wrote:
>> Got my T1 kit last night, got the parts inventoried, and got up to where
>> I need to start winding the toroids... I did notice one thing on the
>> schematic that left me puzzled though, there doesn't seem to be any DC
>> return path for the relay coils. Am I missing something?
>>
>> 73, Ross N4RP
>>


-- 
FCC Section 97.313(a) “At all times, an amateur station must use the minimum transmitter power necessary to carry out the desired communications.”