Using the DFD1 with the Receiver


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The DFD1 is so easy to put together that instructions on putting the unit together will not be given. I did take some pictures as I put one together and they can be found here: DFD1 Construction Pictures

Do not solder the 3 10K multiturn pots on the circuit board. They are relay switched to provide the correct offset for the different bands.

If you have one already built up, you will need to remove the pots for the coarse and the prescale adjustments for the counter to work on all four bands. The fine adjustment is set to zero.

Emphasis here will be getting the DFD1 to work with the receiver to output the correct frequencies. Construction of the relay switching circuit is a tad more difficult than using the DFD2. But it is easier to connect to the receiver as only two wires need to interconnect to the receiver, and only one small coax cable to the VFO.

These instructions can also be used to set other frequency counters that have an offset function to work with the receiver.

The problem of birdies entering the receiver from the frequency display will also be addressed and can be used for the DFD2, as well as the DFD1.

Interfacing the DFD1 to the Electroluminescent Receiver

Parts needed:

  • One DPDT relay - 12 Volt or 5 volt with a 220 ohm resistor in series with the 12 Volt line.
  • Four 10 turn 10K pots - same type as used in the counter, miniature rectangular shaped multiturn. Three are supplied with the kit.
  • One diode - spike suppression
  • One .01 capacitor - bypass used with the diode for spike suppression
  • Hook-up wire - several different colors helps simplify tracing the circuit, but not necessary.

    If the DFD1 is ordered with the receiver kit the 5 volt relay, 220 ohm resistor, diode and capacitor will be included with the DFD1 bag of parts. You will need one multiturn 10K pot (or equivalent) and hook-up wire.

    Setting the offsets:

    ____Check to make sure you have soldered in the jumper for the Fine Adjustment, grounding the center terminal. If the Fine Adjustment pot was already installed, set it for zero reading between the center terminal and ground.
    ____Ground the VFO input to the counter PCB. There will be false readings if this is not done.
    ____The two wires going to the receiver do not need to be connected to set the offsets.
    ____Apply power and make sure there is no power to the relay. The 30/17 Crystal Filter connection will be left ungrounded.
    ____Set V1 and V2 (see circuit diagram) to 3.546.88 MHz, or as close as possible to 3.546.00 MHz. Using a VOM, set the voltages close to the ones on the circuit diagram, then use the reading on the display to finish the settings. You will be adjusting the relays that are wired across from each other (the NC connections) on the relay.
    ____Ground the lead from the relay to the receiver (the 30/17 Crystal Filter connection).
    ____Set V3 and V4 (see circuit diagram) to 4.000.00. You should be able to get it right on frequency. As above, set the voltages close to the ones on the circuit diagram, then use the reading on the display. You will be adjusting the relays that are wired across from each other (the NO connections) on the end of the relay.
    ____Mount the interface circuit where you want and connect the two wires that go to the receiver.

    • Circuit Diagram

    Wiring the Relay

    Shown is the "dead bug" illustration of how to wire the relay and multiturn pots. The bottom pin of the pots is soldered to the ground plane, the center pin is connected to the relay, and 5 volts (taken from the PCB of the counter) is connected to the top pins.

    NO - normally open position of the relay
    NC - normally closed position of the relay
    C - common connection to the relay contacts
    Coil - contacts for the coil of the relay

    The 20 meg resistor and nearby .01 cap are used to help secure the relay to the ground plane. The .01 helps with spike protection. The .01 and 1N4148 on the other coil connection are the main spike protection components. When building the circuit, wiring the above parts helps keep the relay stay put on the ground plane while the multiturn pots are wired on the relay.

    The relay is a 5 volt part (supplied with the kit when ordered with the receiver), and a 220 ohm resistor is needed to provide a voltage drop to the relay to prevent it from burning up.

    A much neater layout can be achieved with little effort!

    PCB Connections

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