In my last post, we were discussing my creating and
posting a video of my SimpleX homebrew receiver.
Here's a link to Youtube where my video resides.http://www.youtube.com/watch?v=JcMQp5-jvmY
Photo's & schematic are at:http://www.bignick.net/simplex/simplex.htm
For those following the thread, I was having trouble
eliminating double peaks in my front-end tuning.
(Maybe these videos can be developed and provide some
insight for other homebrewers?)
I'll repeat my last reply here since the thread
had probably gone cold by now!
And, I had another thought .. the ARRL version features
a "dust-cover" Bud Box over the dual-section capacitor.
(Perhaps an enclosure would provide an additional measure
of shielding/anti-coupling between capacitor
My last reply repeated:
I hope to post a video that illustrates my SimpleX
But, until then I wanted everyone to know that I
have read their responses and am working on resolving
So far, I have:
Checked to see that I haven't wired the two stators
together. I even disconnected the wiring to the stators
just in case there was a hidden connection under the
ceramic base that was shorting the two together, but they
measure good (i.e. independent, not shorted together)
The shield between stators *is* grounded (Maybe it
needs a larger shield?)
I even tried jumpering out L2 in case its value was too
large, but no difference.
Incidentally, the text directs one to use a 100K 1W
or larger resistor for a coil form for L2.
My assumption was that the DC resistance of L2 would swamp out
the resistor's value, and that the resistor is only
being used as a coil form.
I did not use a resistor, I used a blank coil form
with wire leads. I could try winding a coil around
a resistor to see if it makes any difference?
--Tom Nickel KC9KEP
PS: I *am* using 20K headphones and that is why I have
elected to wire the headset jack to the audio output plate
via a 0.022 uF capacitor ..