TR-25 CW Transceiver Kit (Retired)

TR-25 is Retired and No Longer Available

Here is a compact but powerful 2-band CW transceiver kit that uses no tiny pushbuttons, and without those seemingly endless and hard-to-remember back menus. There is a knob or a switch for every function!

DC Input Voltage Vs. Typical RF Output

• Size 5 ½ X 3 ¼ X 1 ½ less protrusions, weight 10.6 Oz
• Full CW band coverage of 40 and 20 meters
• Optimized for operation from 3 series-connected 18650 Lithium cells
• RIT tunes + and – 5KHz
• Blue OLED display reads frequency to 10 Hz and RIT offset
• Built in Iambic keyer is adjustable 5 to 35 WPM with front panel control
• Separate jacks for straight key and paddles; Always ready for SKCC contacts
• Operates on 9.5 to 14 volts, < 110ma receive, about 1.1 Amp Xmitt at 10 volts
• Selectable tuning resolution steps of 10, 100, and 1000Hz
• Low battery indicator with internal adjustment 9.5 to 11.5 volts 
• Front panel adjustable RF gain control
• Front panel TX power control; Adjustable from 0 to full output
• Rugged TO-220 FET RF amp has delivered 5 Watts key down for 5 minutes
• Signal quality blue LED, RIT warning orange LED, Low battery red LED
• More than enough audio to fill any room with an external speaker
• Excellent receiver sensitivity with MDS of -125dBm
• Very effective receive AGC prevents ear damage with strong signals
• Transmitter harmonics and spurs -52dB, meets FCC specs
• CW sidetone is the actual transmitter signal as heard by receiver
• Match the received signal tone to the sidetone for perfect zero beating
• Sharp IF filter; Better than 350 Hz at the -6dB point, plus 700 Hz audio filter
• Over 200 machine placed SMT parts, and about 55 user installed parts
• All critical circuits are factory pre-aligned and calibrated
• No endless “back menus”; There is a control or switch for every function
• Options include pre-wound toroid coils and complete factory assembly

Resources:

• TR-25 Pre-Assembly Information
• TR-25 Lower Board Assembly Procedure
• TR-25 Upper Board Assembly Procedure
• TR-25 Final Assembly
• TR-25 V020 Mod
• TR-25 Checks and Tests
• TR-25 Operating Instructions
• TR-25 Lower Board Schematic
• TR-25 Upper Board Schematic

TR-25 Reviews:

• https://k0ssk.net/post/tr-25-2021-10-02
• https://k0ssk.net/post/sota-konocti-2021-10-17/
• ARRL Review (PDF)