[AMRadio] Globe Champ 350 and HQ-170 are on the Air!

[Kim Elmore]

I was really more interested in knowing that nothing was terribly 
wrong. I have to admit that I don't run a monitor scope. I checked 
the rig with a scope on the bench and while refurbishing it and with 
the mic I currently have, whose audio characteristics I don't much 
like (a Shure 404C), modulation looks very good. As per the manual, 
if I see peak modulator current above 200 mA, I'm over modulating. 
While on the bench, I found that using the compressor helps prevent 
over modulation and so I typically use it.

As for the vertical dipole, it's not full size! It's a Force 12 Sigma 
80 (a picture is at 
www.texasantennas.com/index.php?option=com_content&view=article&id=96&Itemid=108) 
and is only 36 ft tall. It's an off-center-fed  vertical dipole with 
physically large elements (3" diameter), large capacitive loading 
bars on the ends (horizontal bars about 20 ft long), and physically 
large inductors at the feed points (3/8" diameter aluminum tubing 
wound in 8" diameter coils). I use it because I built my station 
primarily for DXing and wanted an efficient, low-angle radiator for 
80 m and at this it does very well. At the time I got it, I lived in 
a wooded area and radials were, put mildly, problematic. Mine is 
resonant (1.05:1) at about 3525 kHz, with SWR of 1.4:1 at 3500 kHz, 
and 3:1 at about 3600 kHz.

With all that, it's a pretty crummy short-haul antenna. It makes a 
fine ground wave but has a big skip zone. I plan to put up a dipole 
for 75 m on my 48 ft tower, which should work much better for 
short-haul comms. I simply haven't managed it yet.

73 & MX,

Kim N5OP

At 11:43 AM 12/22/2011, you wrote:
>Many hams will not give an audio comment unless it is extremely
>distorted or completely unreadable.  Are you looking at the carrier
>with an oscilloscope?  Make sure the audio is almost pinching off the
>carrier.
>
>If it is okay then your problem probably is the vertical dipole (on 75
>m. that's a pretty tall dipole!).
>
>If you put up a horizontal one at 70 feet you'll be heard by plenty of hams.
>
>73
>
>Rob
>K5UJ
>
>
>On Wed, Dec 14, 2011 at 10:46 AM, Kimberly Elmore
><cw_de_n5op at sbcglobal.net> wrote:
>
> >
> > I did work a morning group in the KS-MO region this 
> morning  Theye did not hear
> > me as well as each other, but a couple of them had very good signals into
> > Norman. I got not negative comments on my audio, so things can't be too
> > terrible.
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