Omni-D Model 546 Series C

Solid-state 200 watt input transceiver covering 160 - 10 meters.

• eHam

• Difference Between the Omni A, B, & C
• AB2RA tips & comments

• Hang AGC
• N4LQ Audio "Boost" Mod
• IC1 op-amp replacement Audio Mod
• Omni A/B/C/D AGC Mod
• S-Meter Lamp Mod
• Loose Preselector Fix
• PTO Drift
• Youtube video showing PTO mod with constant powering, zero drift
• N1OOQ Mod to add 30M transmit

• Model 217 500 Hz CW Filter
• Model 219 250 Hz CW Filter
• Model 218 1.8 kHz SSB Filter
• Model 243 Remote VFO
• Model 255 Power Supply / Speaker
• Model 280 Power Supply
• Model 645 Dual Paddle Keyer
• Model 670 Single Paddle Keyer
• Model 234 Speech Processor
• Model 214 Condenser Microphone
• Model 247 Antenna Tuner

• Frequency Coverage: 1.8 - 2.3, 3.5 - 4.0, 7.0 - 7.5, 10.0 - 10.5, 14.0 - 14.5, 21.0 - 21.5, 28.0 - 28.5, 28.5 - 29.0, 29.0 - 29.5, 29.5 - 30.0 MHz transceive. (VFO provides approximately 40 kHz overrun on each band edge.).
• VFO Stability: Less than 15 Hz change per F^o averaged over a 40^o change from 70^o to 110^o F after 30 minutes warmup. Less than 10 Hz change from 105 to 125 Vac line voltage when using a TEN-TEC power supply.
• Tuning Rate: Vernier, 18 kHz per revolution, typical.
• Readout: Six digit, 0.43" LED numerals. Least significant digit indicating 100 Hz green, all others red.
• Accuracy: +/- 100 Hz.
• Semi-Conductors: 1 LSI, 20 IC's, 47 transistors, 29 diodes, 21 pin diodes, 6 LED readouts.
• PC Boards: 14 plug-in, 13 integral.
• Construction: Rigid aluminum chassis. Dark painted aluminum front and rear panels, black vinyl covered aluminum top and bottom. satin etched and extruded panel trim. Snap-up wire front bail.
• Power Required: 12-14 Vdc, 850 mA receive, 18.5 A max transmit.
• Dimensions: HWD 5.50" x 14.25" x 14".
• Weight: 14.5 lbs.

• Sensitivity: Tailored from 2.0 uV on 1.8 MHz band to 0.3 uV on 28 MHz band for 10 dB S+N/N.
• Selectivity: 8 pole ladder filter. 2.4 kHz bandwidth, 1.7 to 1 shape factor at 6/60 dB. With Model 217 installed: 500 Hz bandwidth, 1.9 to 1 shape factor. With Model 218 installed: 1800 Hz bandwidth, 1.8 to 1 shape factor. With Model 219 installed: 250 Hz bandwidth, 2.0 to 1 shape factor.
• Audio Filter Selectivity: Center frequency 750 Hz. One section has 450 Hz bandwidth, down 10 dB at 400 Hz and 1500 Hz. Four sections have 150 Hz bandwidth, down 40 dB at 400 Hz and 1500 Hz.
• Intermediate Frequency: 9 MHz.
• Antenna Input: Low impedance, unbalanced.
• Audio Output: 1.5 watts @ 4 ohms with less than 2% distortion. Built-in speaker, external PHONES jack.
• Spurious Response: All below equivalent 10 dB S+N/N signal except 1.838 MHz (less than 15 dB S+N/N), 21.320 MHz (less than 20 dB S+N/N), and 28.980 MHz (which can be eliminated by using low end 29.0 - 29.5 MHz band segment).
• CW Spot: With 750 Hz reference tone.
• S-Meter: Automatically switched on when receiving.
• Dynamic Range: 90 dB, typical.
• Attenuator: PIN diode, 18 dB, typical, for increased dynamic range.
• Offset Tuning: Dual range, MAX +/- 4 kHz; MIN +/- 500 Hz, typical.
• CW Filter: Built-in. 150 Hz bandwidth centered at 750 Hz. Shape factor 7.2 to 1 @ 6/60 dB. 3 selectable response curves.
• Zero Beat: Disables transmitter offset in cw mode for accurate frequency adjustment.
• Notch Filter: 50 dB audio rejection notch filter tunable from 250 Hz to greater than 6 kHz.
• Noise Blanker: Built-in. High dynamic range i-f type with balanced noise gate for minimum switch noise.
• WWV: Reception at 10 MHz.

• DC Power Input: Maximum input power 200 watts @ 14 Vdc cw and ssb. 100% duty cycle for up to 20 minutes.
• RF Output: 85 - 100 watts, typical.
• Output Impedance: 50 ohms, unbalanced.
• Microphone Impedance: High impedance crystal, ceramic, or dynamic.
• T/R Switching: VOX or PTT on ssb. Instant break-in on cw.
• CW Sidetone: Internally generated. Adjustable tone and volume independent of AF gain control. Operates only in cw mode.
• SSB Generation: 9 MHz, 8 pole crystal ladder filter. Balanced modulator.
• Carrier Suppression: 60 dB, minimum.
• Sideband Suppression: 60 dB, minimum, at 1 kHz tone.
• Spurious Output: Better than -40 dB.
• Meter: Indicates SWR on transmit.
• CW Offset: 750 Hz, automatic
• ALC Control: Front panel, LED indicator.