SGC Smartuner SG-235 User Manual

Review: The MFJ-994BRT and MFJ-998RT Remote Automatic Antenna Tuners By Phil Salas – AD5X Introduction I previously reviewed the MFJ-927, CG-3000 and

Band Shack SWR no tuning Shack SWR w/tuning Shack SWR w/tuning 160M >20:1 NT (expected) NT (expected) 80M 11:1 1.53:1

external DC jack for powering the units directly from a DC source if desired. If you have an early MFJ-994BRT or MFJ-998RT and wish these improvement

The MFJ-994BRT and MFJ-998RT are remote versions of the current MFJ-994B (600 watt) and MFJ-998 (1500 watt) switched-L desk-top auto-tuners (the MFJ-9

power and then transmit on that frequency. The MFJ-994BRT and MFJ-998RT will re-tune and re-store the new tuning data for that frequency only. All o

While resistive matching tests are great for standard antenna tuner comparison testing, remote tuners will experience maximum inductance and highest R

I built these variations (along with additional capability for future testing) into one fixture so I could clip-in the desired simulated antenna for

Figure 6: MFJ-994BRT interfaces Figure 7: Internal view of the MFJ-994BRT My resistive load tuning range and loss measurements are

Next I measured the MFJ-994BRT tuner losses into the 160-meter spec-limit antenna simulator and the 43-foot vertical simulator as described earlier.

SWR Load Ω (Ideal pwr) 160m 80m 40m 20m 10m 4.33:1 11.5 (2.31W) Power Meas 2.27(2%) 2.23(3%) 2.2

160M NT NT NT NT 80M NT NT NT NT 40M NT 8.4:1 SWR NT NT 30M NT 9.2:1 SWR NT 2.43:1 SWR 20M NT 1.74:1 SWR NT 1.38:1