Specifications

46
SGC Inc. SGC Building, 13737 S.E. 26th St. Bellevue, WA 98005 USA
P.O. Box 3526, 98009 Fax: [phone] Tel: [phone] or 1-800-259 7331
E-mail: [e-mail] Web site: http://www.sgcworld.com
© 1998 SGC Inc
SG-235 Manual
Note: When changing to a new frequency, the SG-235 has a 4 second time delay
before it will initiate a retune cycle. This can be bypassed by connecting
Brown wire (PTT IN) to your radio external PTT output.
Next the SSB transmitter should be adjusted to the lowest desired frequency,
and the test as outlined above should be repeated. The SG-235 should immedi-
ately sense the mismatch, and switch to the tune mode to retune the antenna
system. Since the algorithm must search through more possible values of L
and C to find an appropriate combination at the lower frequencies, the tune
cycle may take longer. A few spoken words should achieve an "all tuned" indi-
cation. The SG-235 installation and tune-up is considered complete if the
above tests have been successfully performed.
The SG-235 will probably not be supplied from SGC with memory data appro-
priate to your installation, and the memory feature may not seem impressive
at first. Allow the SG-235 to "learn" your antenna's requirements by proceed-
ing from frequency to frequency and allowing the normal tune-up to occur.
As the SG-235 computer memorizes more and more frequencies, you should
then be able to return to a previously tuned frequency and find that the cou-
pler immediately responds 'ALL TUNED', even before the first word is complet-
ed. The memory system is capable of storing hundreds of individual frequen-
cy/relay combinations, mostly in the lower operating frequencies. This pro-
vides better memory resolution at the lower frequencies where antenna sys-
tems are inherently narrow band. Usually, only one or two memory positions
are needed to provide satisfactory coverage at higher frequency bands.
12 volt power source
SGÐ2000 HF radio
(View: Back panel
of unit)
Watt meter
SGÐ235
Antenna
Counterpoise
Terminal block
for DC power
cable
Smartlock
SG-2000 -->SG-235
Black (of coupler cable) = ground
Red (of coupler cable) = +12 VDC
Green = tuned indication