On Fri, Jun 27, 2008 at 07:10:07AM -0700, James C. Owen, III wrote:
> I have a Jupiter and since it's very close to a Pegasus the mike used
> should work the same on both. I use an unamplified D-104 and it works
> fine and I get excellent reports. The guys that know me say it sounds
> natural. In fact I have used this same D-104 on every rig I've owned for
> the last 50 years and always gotten excellent reports. There is only one
> TT rig I've found that it doesn't work with and I forget if it's the
> Scout or the Argonaut V. The rig's input impedance is too low and I get
> very low output. However the amplified one works fine.
The Astatic amplifier in the D-104 base is designed as an impedence matching
device, not a "talk power improver" (whatever that would be). There is some
insertion loss, so if the gain is set at it's lowest, the output is actually
lower than with out it.
Set moderately, it works fine. What gave the D-104 it's bad reputation was
the use of it a full gain (where the amp distorts, like most amps), or the
"improved" amplifers that were added to them. The mobile version of the
D-104 was so big, it was easy to add these "improvements".
For ham radio use, the "improvements" are not needed or desired, so the stock
amp, set to medium gain will do well with these.
I also built my own amplifer from a book of circuits published by the ARRL,
writen by the late Doug DeMaw (W1CER at the time).
For SSB, I prefer the Astatic 10-DA mike, which plugs into the same stands.
For FM, the D-104 is fine. It has more to do with my voice than anything else.
YMMV.
--
Geoffrey S. Mendelson, Jerusalem, Israel gsm@mendelson.com N3OWJ/4X1GM
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