Crystal Filter

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4.0 & 3.547MHz Crystal Filters

Band Image Scheme || Crystal Filter/Crystal Oscillator Work in Unison

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Switching Action Adjusting Crystal Filter Bandwidth 12 Volt Isolation and Shielding

Crystal Filter Inputs

The crystal filters are the control center of this receiver. All the important IR (infra-red) action occurs here.

Both crystal filters will hit two bands with a technique called band imaging. By using the difference and sum of a crystal filter frequency with a VFO frequency, two amateur bands can be received with each crystal frequency.

For an example of this technique, check out the 1988 ARRL Handbook for Radio Amateurs, Chapter 30. "A Band-Imaging CW Receiver for 10 and 18 MHz".

The upper IRED is pointing across the board to a phototransistor located between the two VFO amplifiers. This phototransistor turns on the 10.545 VFO relay. The lower IRED is pointed upward to hit the photo transistor at the crystal oscillator on the upper board (mounted upside down on the upper board underneath the crystal oscillator), which turns on the crystal oscillator to 3.547MHz.


Band Image Scheme

According to the article "A Band Imaging CW Receiver for 10 and 18 MHz", "A band imaging receiver appeared in every edition of this Handbook from 1953 through 1966, from "A Two-Band Four-Tube Superheterodyne" in 1953 to "The HB-65 Five-Band Receiver in 1966."

This receiver uses two band imaging schemes. The difference between the two band imaging schemes is 455kHz. This allows a 455kHz strip to be used giving excellent AGC and gain.

The first band imaging frequency uses the 3.547 MHz crystal filter to receive the 40 and 20 meter bands. One VFO at 10.455 MHz and up can cover both bands. However, the 40 meter band does not start until 10.545 MHz, which is inconvenient for quick band switching. For that reason, the VFO has two relays, [one set for 10.545 MHz (40 meters) and one set for 10.455 MHz (20 meters)] so both bands can be set at the beginning of the band.

The second band imaging frequency uses the 4.000 crystal filter to receive 30 and 17 meters. A 14 MHz VFO is band imaged with the 4.000 MHz crystal filter.

The 17 meter band starts at the VFO frequency of 14.068MHz to 14.168MHz and the 30 meter band starts at 14.100MHZ to 14.150MHz. Since both bands are covered completely by a 100KHz spread on the VFO, one VFO covering the 17 meter band does the job.

Crystal Oscillator
The BPX38, the photo transistor, is mounted underneath the board and cannot be seen in this photo. The crystal on top is the 4.000MHz crystal. The 4.000MHz crystal is turned on in the photo. The other LED below the one that is on, turns on the 3.547MHz crystal.


Crystal Filter/Crystal Oscillator Work in Unison

Two different frequencies are needed at the crystal oscillator, feeding the second mixer, to provide a 455kHz output with each crystal filter.

Diode switching is used to switch the crystals at the oscillator. LEDs are used instead of diodes. The LEDs provide an indicator of which crystal is turned on, providing diagnosis of proper operation of the switching circuit.

The crystal ground circuit first goes through a capacitor, and then to the LED which grounds the crystal. A switching circuit using IRFU220s switch the crystals and LEDs.

The capacitor serves two purposes. The first one is to trim the frequency of the crystals so that the BFO frequency is the same when switching between the crystal filters. A value of 200pf was found to get the frequencies close. An optional trim cap (unmarked holes on the PCB) was added in parallel to the 4.000 crystal capacitor, to help get them exact if the operator desires.