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Back when these were available, I bought one and found it very helpful
for receiving local MW broadcasting inside steel-framed buildings on
campus, as well as for the usual SW stuff, all in a compact package that
was a great add-on to enhance the wideband capabilities of the VR-500.
One day, the darn thing just seemed to quit working. In the middle of
grad school, I had no time to mess with it, so set it aside. Grove had
quit making them by then, so couldn't order new, either. Fast forward to
getting my degree, I've been putting the shack back together and came
across it. Hmmm? What's this, I must've put the wrong battery in! Seems
I somehow ended up with some A23 batteries, which are very close in size
to the N 1.5v volt ones used in the Active Duck, but are 12 volts!
Yikes, well that explains why the Duck was dead...
Maybe you have the same issue?
So I started digging. The gits are enveloped in a tacky substance to
hold it all in place, so rather mysterious and hard to get to. Once
cleaned up, it's a simple circuit consisting of resistors, caps and a
single transistor.labeled "J310 C9112" that is obsolete. After some
cross-referencing, I substituted another FET, Mouser Part # 610-2N5457
and reassembled. Works well and helps get reception in places where it's
hard, as well as making a more compact package for SWL and other stuff.
I did find that my Pryme 16" whip (apparently Pryme is getting out of
the antenna biz, sadly) works better for HF than the Active Duck in
comparison tests on 11175, but can't beat the ADuck for compactness.
Between the two options, my VR-500 is a portable utility/DX machine.
Mike Lehman
Urbana, IL
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<p>Back when these were available, I bought one and found it very helpful <br>
for receiving local MW broadcasting inside steel-framed buildings on <br>
campus, as well as for the usual SW stuff, all in a compact package that <br>
was a great add-on to enhance the wideband capabilities of the VR-500.<br>
<br>
One day, the darn thing just seemed to quit working. In the middle of <br>
grad school, I had no time to mess with it, so set it aside. Grove had <br>
quit making them by then, so couldn't order new, either. Fast forward to <br>
getting my degree, I've been putting the shack back together and came <br>
across it. Hmmm? What's this, I must've put the wrong battery in! Seems <br>
I somehow ended up with some A23 batteries, which are very close in size <br>
to the N 1.5v volt ones used in the Active Duck, but are 12 volts! <br>
Yikes, well that explains why the Duck was dead...<br>
<br>
Maybe you have the same issue?<br>
<br>
So I started digging. The gits are enveloped in a tacky substance to <br>
hold it all in place, so rather mysterious and hard to get to. Once <br>
cleaned up, it's a simple circuit consisting of resistors, caps and a <br>
single transistor.labeled "J310 C9112" that is obsolete. After some <br>
cross-referencing, I substituted another FET, Mouser Part # 610-2N5457 <br>
and reassembled. Works well and helps get reception in places where it's <br>
hard, as well as making a more compact package for SWL and other stuff.<br>
<br>
I did find that my Pryme 16" whip (apparently Pryme is getting out of <br>
the antenna biz, sadly) works better for HF than the Active Duck in <br>
comparison tests on 11175, but can't beat the ADuck for compactness. <br>
Between the two options, my VR-500 is a portable utility/DX machine.<br>
<br>
Mike Lehman<br>
<br>
Urbana, IL<br>
<br>
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