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National NCX-5, 24.50 10 Meter New JAN Crystal

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  • National NCX-5, 24.50 10 Meter New JAN Crystal
  • National NCX-5, 24.50 10 Meter New JAN Crystal
$35.00
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Description

National NCX-5, 24.50 10 Meter New JAN Crystal.yy

I tested this crystal on my custom crystal checker and it is on frequency.

The NCX-5 is a multi-band HF transceiver covering the 80, 40, 20, 15, and 10 meter amateur bands, supporting SSB (single sideband), CW (Morse code), and AM modes, with approximately 100-200 watts PEP output (depending on version and power supply).It uses crystal-controlled heterodyne mixing for band selection, in addition to a transistorized VFO (variable frequency oscillator) for tuning within bands.The 24.5000 MHz crystal (precisely 24.5 MHz) serves as a heterodyne oscillator crystal specifically for the 10-meter band (28-29.7 MHz).How it worksIn the NCX-5's double-conversion design:
  • The VFO tunes around 5.0-5.5 MHz.
  • Band-specific crystals mix with the VFO signal to produce the injection frequency for the first mixer.
  • For 10 meters, the 24.5 MHz crystal enables coverage of that band (e.g., mixing schemes like 28 MHz - 5 MHz VFO ≈ 23 MHz range, adjusted via the fixed crystal).
This is a standard practice in vintage transceivers like the NCX-5, where separate crystals are plugged in or switched for each band.Evidence from similar era designs and crystal frequency charts confirms 24.5 MHz crystals are commonly used for 10-meter (10.0-10.5 MHz sub-ranges in some contexts, but aligned here for 28 MHz ham band).If the crystal is faulty or missing, the transceiver would lack proper operation on 10 meters. 
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