General Specifications

• Frequency Range (Receive): 160kHz – 148MHz  in 16 bands

• Frequency Range (Transmit): 1.6MHz – 30MHz (160m–10m HF bands) at 100W, 40MHz (8m), 50MHz (6m), 70MHz (4m) at reduced power (TDA)

• Operating Modes: CW, SSB (USB/LSB), FT8, WSPR and other data modes

• Band Pass Filtering: Individual band-pass filters for each of 16 bands

• Supply Voltage: 13.8 VDC nom [ 11-16 VDC]

• Current Consumption: Rx: ~350mA / Tx: ~16A Nom

• Dimensions (W×H×D): 275mm x 135mm x 260mm

• Weight: 3kg nom

Receiver Specifications

• Circuit Type: Single Conversion Superheterodyne

• IF: 8MHz

• Sensitivity: SSB/CW: 0.2µV for 10dB S/N, measured as -121dBm @12dB SINAD

• Selectivity (SSB Filter): 2.3 kHz / -6dB

• Selectivity (CW Filter): 500 Hz / -6dB]

• Audio Output Power: 2.4W into 4 Ohms, 1.5W into 8 Ohms

Transmitter Specifications

• RF Output Power (HF Bands): 100 Watts (or more)

• RF Output Power (VHF/Mid Bands): [to be published for 8m/6m/4m]

• Spurious Radiation: Better than -50dBc

• Carrier Suppression: Better than -50dB

• Unwanted Sideband Suppression: Better than -50dB target (to be published)

Advanced Filtering & Features

• Noise Blanker Pulse Rejection Range: -90dBm to over 0dBm

• Audio Filter Stages: 4-Stage Active Audio Filtering (400Hz Hi Pass, 2200Hz Low Pass, 2000Hz Low Pass for SSB & 800Hz peak filter for CW. Switch selectable)

• Notch Filter Rejection: Better than 60dB

• RIT Range: ±9.99 kHz

• CW Side-Tone Pitch: Adjustable from 400Hz to 1000Hz (in 100Hz steps)

• Linear Amplifier Delay Relay: Adjustable from 0 to 1000ms (in 100ms steps)

Other Features

• Very low noise high performance receiver. (You can put the volume fully up and won’t be deafened by noise. You won’t loose weaker stations in the noise generated inside your rig. (Try your rig with headphones and turn up the volume with a dummy load fitted. On a poor receiver it will sound like un-squelched FM, on a digital receiver they often mute under a certain level!)

• Ease of use User Interface:

  • One function per button keypad for fast and easy operation. Button presses and menus have been kept to a minimum. Only the CW button and Func buttons have circular menus for less used feature selections

  • The main dial has 2 purposes, Tune and Function select / adjustment

• Real rotary controls are used along the bottom of the Transceiver. (No need to wade through complex and time consuming menus). These are Noise blanker for wood-pecker etc, IF Gain & AGC Decay, AF Gain & AF Filter & Notch filter.

• SSB & Full break-in CW, both straight key and paddle (dual contact) keyer. IAMBIC A & B, FIFO (first-in-first-out queueing) and straight keying.

• Up to 16 bands. You just fit the parts for the bands you want

• Capable of 16 bands, but initially will be 1.8-54MHZ. The VFO is capable of all LF, HF & VHF bands

• LF and VHF bands (2m) following, VFO and BPF ready now

• Build on 4 PCBs with little inter-board wiring (Mainly ribbon cables)

• An extra data PCB built in provides a USB hub and connection to the processor for CAT, and inbuilt sound card for audio RX and TX connection.

• Function rotary control for adjustment of the function selected by the last button press

• 400 pulse per revolution tuning control, with a a spin and feel in a class of it’s own

• One Raspberry Pi Pico microprocessors and TFT digital readout.

• A lot of effort has gone into not compromising the original performance by including digital technology

• Various component footprints are designed for more than one component type to be used. Examples are for the relays, transistors/FETS, SSB filter etc.

• Any extra PCB space has been filled with PTH holes so experiments / enhancements can be fitted on-board. Many component footprints are combined so for instance wired or SMD transistors / FETs can be fitted (eg 3sk51 / BF998)

• Dual memory system built into the software functionality. One for more permanent frequency memories (Memory over power down), and the other for temporary memories say on contest days for fast memory store and delete for working through the band, and quick return to stations not yet worked

• IF Output for external waterfall displays etc.

See the Test Results page for comprehensive technical comparisons of the HamPi and other transceivers.