Specifications

SMARTUNER MANUAL 8

SGC Inc. SGC Building, 13737 S.E. 26th St. Bellevue, WA. 98005 USA

E-Mail: sgc@sgcworld.com Web Site: www.sgcworld.com

(foam dielectric) or Belden type 9943 coax. Both of these will reduce attenuation to

less than 1 dB per hundred feet. You should be aware that this heavier cable is less

easy to work and may be quite expensive.

• The second loss which must be considered is the losses in the DC power and reset

control line. At any distance other than the 9-foot cable that is supplied by SGC, we

recommend that the DC voltage at the antenna coupler be measured because if the

coupler voltage drops below 10 volts, the coupler may not operate properly.

For this reason, SGC recommends that if distances are great, the input DC voltage at

the transmitter site be adjusted to provide for +12 to +14 volts at the coupler site.

We do specifically advise against use of a different power supply than the one used to

power the radio because of the danger of creating ground loops which may cause

oscillation of the final amplifiers or other undesired side effects. If you decide to use a

separate power supply mounted at the antenna coupler location, please be advised that

SGC does not provide technical support in this area.

1.8 Upgrade Sequence

The current version of the SMARTUNER coupler will have a revision letter located on

the printed circuit board. To continue moving forward in coupler design, the

SMARTUNER may be revised as needed. Later revisions of the coupler will be denoted

by the subsequent letters of the alphabet.

SGC will continue making incremental improvements in the SMARTUNER product.

When you buy your product today and a new feature is added, you can always

upgrade for modest fees to the latest version of the unit. If you would like to upgrade to

the latest version of the unit, contact SGC because special discounts are always

provided to our valued customers.

2.0 SPECIFICATIONS - SMARTUNER

HF Frequency Range: 1.8 to 30.0 MHz

Note: The SMARTUNER may be operated as low as

1.6 MHz and is commonly used as an antenna-

matching unit for differential GPS transmitter site

antennas. However, when operated under these

conditions, a longer antenna is recommended, such

as a 60-foot tower section for operation in the 1700-

1710 kHz band and an appropriately larger

counterpoise. In addition, inductor heating may

become pronounced at high power levels in the

SMARTUNER's inductors, which are commonly

used at these frequencies. For this reason, we