Posted by
Ross Primrose N4RP on
URL: http://elecraft.85.s1.nabble.com/T1-build-tp6089544p6095825.html
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.”
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