On 17/06/2013 23:28, Hans Summers wrote:
If someone builds a 6m design, 7-element LPF which
will fit on the kit PCB, I am happy to stock them in the shop.
Done. That was very simple, I designed one some years ago and it is
used on my Linear Mixer - Broadband Linear PA - VHF MEPT system, so
I knocked up another.
I think it would be good if someone proves
it works first ;-)
One free Ultimate2 kit (or other kits of equivalent value) to
whoever proves the U2 works on 6m, and has reception reports to
prove it!
:-) . What is the
penalty for proving that the U2 does not work at 50MHz.?
I should have just measured before building an LPF but then none of
us would have been fully happy. The U2 certainly radiates a signal
on 50MHz but not via the antenna socket. The square wave drive from
the DDS at 28MHz is rather marginal, at 50MHz it is a smear of very
low amplitude, the Output FET just gets
very hot.
In TX mode the output voltage across 50 Ohms is zero contrasted with
the voltage in Standby prior to TX of 0.2V (400uW) at I assume
6.25MHz.
73 Eddie G3ZJO
