Transmitter to Interface with the ELR

The following are my initial efforts at putting together a transmitter to work in transceive mode with the Electroluminescent Receiver Kit.

Using a stabilizer with the receiver VFO, the transmit stability has been excellent and the circuit used for keying has been given lots of compliments.

The final schematics and my dead bug pictures of the transmitter will be shown: First, modifications to the ELR - adding two relays, second, the front end of the transmitter - mixer, oscillator, keying, and mute circuits. The mixer output goes to the receiver RF Amplifier and Bandpass filters to amplify and clean the broadband output of the mixer. Third, schematics and pictures for the RF driver, amplifier, and lowpass filters.

The picture below is a block diagram of the transmitter and interface with the receiver.

Modifications to the Electroluminescent Receiver

There are three modifications to the receiver.

First is adding two relays to the input and output of Section 2, Board 1 of the receiver. The receiver RF amplifier and Bandpass Filters are used to amplify and filter the 1496 mixer's output.

The second modification is adding another IRED to the bottom of the Section 2, Board 1 at the 20/17 Bandpass filter. The IREDs are all modified to run in series, rather than parallel, as the original is laid out. Routing the IREDs in series is the preferred way of wiring multiple LEDs from one power source and should have been done with the original circuit.

The third modification is changing the 3.547 MHz IF (Crystal Filter) to 4.000 MHz, locking down the Crystal Oscillator to 3.547 MHz and changing the VFO frequencies for a 4 MHz IF.

Adding Relays to Section 2, Board 1

Two SPDT relays are glued to each end of Section 2 as shown in the above picture. Wires for the coil ground (and cable grounds) can also be used to hold the relays down (as shown in the pictures below) soldered to the ground plane below the line of holes between Section 2 and 3.

The trace between the INPUT OUT and INPUT IN is cut to allow the lower relay to switch the output of the Bandpass Filters.

Antenna Relay

The cable from the Antenna relay goes to the output of the 1496 IC in the transmitter. Section 2 provides amplification (RF Amplifier) and Filtering (Bandpass Filters) for the output of the 1496 mixer.

Since the receiver is tuned for the band being used, it is automatically ready to properly filter the output of the mixer. The result is a very clean output of the mixer amplified just the right amount for the first transmitter RF amplifier.

Notice the 1N914 diode between the coil connections on the relay with the band going to the 12 connection of the relay (top one in the picture above).

Bandpass Filter Relay

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Adding a Third IRED to the 20/17 Bandpass Filter Switching

A third IRED allows IR switching of the transmitter lowpass filters with the switching of the receiver's bandpass filters.

The IREDs are connected in series. The relay's coil resistance provides protection and voltage for the IREDs and are grounded by the IRED above the right hand side of the 20/17 relay.

The Commercial blue emitter shown above is used in this build. If you are mounting the transmitter separate from the receiver, this commercial pair of emitter/receiver and optical cable can to used to automatically switch the lowpass filters of the transmitter.

If the transmitter is stacked above the receiver, a hole is drilled Board 2 above the IRED to line up with a phototransistor (that points down from a hole in the lowpass section of the transmitter) that switches the lowpass filters in the transmitter. Pictures of this later.

Another solution is to separately switch the lowpass filters in the transmitter and not use any fiber optics or IR light.

Commercial Pairs w/1000µm Optical Fiber

Commercial Matched Pair Receiver/Detector
Blue - IRED Emitter || Black - Phototransistor Receiver

This pair of emitter/receiver and optic fiber is called the Experimenter's Kit IF-E10 in the Fiber Optics Kit section of Circuit Specialists web site. It contains a matched pair emitter/detector as pictured above and 1 meter of 1000µm optical fiber.

Crystal Oscillator and Crystal Filter Modifications

1. Short C & E on the Crystal Oscillator Phototransistor - BPX-38. This is to lock the Crystal Oscillator to the 3.457 MHz crystal.

2. Remove the black tubing between the Crystal Filter and the phototransistor at the Crystal Oscillator.

4. Change the 3.547 MHz Crystal Filter to 4.000 MHz crystals - total of three.

VFO Modifications for a Single 4MHz IF Frequency

5. Change the 68pf cap at the 10.545 relay to 47pf, then move the 40 meter VFO to 11.000 MHz.

6. Parallel an 82pf cap to the 35pf trimmer next to the 10.455 relay (underneath the board), and then move the 20 meter VFO to 10.000MHz.

1496 IC Transmit Mixer, Keying, and Switching Circuits

The above schematics have been built and used on the air.

This circuit resolves the problem with chirp in the 4 MHz oscillator with the differential circuit turning on the oscillator before the active mixer. A diode mixer can not be turned off, but an active mixer can, in this case a 1496.

The mute for the receiver, antenna switch, and the Bandpass Filter relays are keyed the same time as the oscillator, then the mixer is turned on. Keying is excellent and clean.

The 1496 uses low level signals so the VFO output, from a 3.3pf cap from between the two VFO amplifiers on the receiver board, to the connecting coax, provides the correct drive level for the 1496.

The output of the 1496 mixer labeled "To Filters" goes to the Antenna relay on Section 2 of Board 1 for amplification and filtering with the receiver RF amplifier and Bandpass Filters through a coax cable.

The output of the receiver RF amplifier and Bandpass Filters is routed to the Driver/Final Amplifier of the transmitter.

The following breaks down each individual section of the above 1496 IC mixer schematic: The Switching section, Oscillator section, Oscillator/1496 Keying section, and the 1496 IC mixer.

I build each section on a separate piece of PCB board. If I make modifications or find a better circuit, modifications will be easy. I keep my old boards in case the the newer one doesn't improve performance.

Another option that makes sense is to put the 1496 IC mixer, the Oscillator, and the Oscillator/1496 Keying section on one board. The Antenna, mute, and BPF switching section on a seperate board.

C5 and C45 are important for the 1496 so that the biasing of the inputs is not disturbed. Do not forget them.

The output uses RF chokes so it is broadbanded and can be used for all four bands of the receiver. A ferrite trifilar coil was initially used but it didn't have the output that using the RF chokes did. Plus, the data sheet recommended the RF Chokes.

Device gain is set with a resistor between pins 2 and 3. I saw no reason to throttle the gain so I set it for highest gain - a jumper wire.

Using a 2.2 pf NPO, mono, or ceramic capacitor from the VFO output between the 1st and 2nd VFO amplifiers in the receiver will set the input to the 1496 pin 10 at just about the right level.

Pin 1 input from the oscillator can set without an oscilloscope by watching the output from the final amplifier. Raise it to just where it peaks and then back off a little adjusting the drive level (R43) at the source of the FET.

The 50K pot "Delay" is set for whatever delay is needed for comfortable CW operation. I use the fastest switching which is the least resistance setting of the pot.

D7 diode isolates the keying of this section.

Q17 provides 12 volts (Key closed) to whatever needs 12 volts to switch. With this transceiver, Q17 switches the Receiver Section 2 relays, Mute (Board 2 IF strip), and the Antenna Relay. Q17 can be any PNP 1 amp transistor. A TIP30A,B,or C will work or any other TIP PNP low frequency transistor rated at 1 amp or above.

The switching (outdoor antenna) circuit shown above came from an ARRL Handbook article and is shown at the bottom of this page.

I modified the output so I could send a + signal to a relay in a three port antenna switch. Placing the relay in the antenna switch helps keep an impedance "bump" to a minimum and all the RF away from the 1496 and receiver circuitry.

Q19 provides a Ground for any circuits that need a ground to switch. If a different setup is used this provides a built-in ground switch in case one is needed.

Differential Keying Section

This circuit turns on the oscillator before the 1496 IC mixer.

Q4 turns on the oscillator and Q5 turns on the 1496 IC. D2 and D3 isolate the keying of the sections.

The 180 uH RF Choke gave the best pulling ability with the 85 pf capacitor for the 4 MHz crystal. When working DX the crystal can be pulled 2 to 5 kHz (not sure) off the receiver frequency.

A crystal tuning capacitor does not need to be as high as 85pf as most of the pulling happens in the first 1 - 30 pf of the capacitor. A 35 pf was used with equal performance.

B+ (12 Volts) enters through R24 and output is at the 1K pot (R43) at the source of Q12. A couple of resistors will replace this pot when values are found that give .2 V Peak to Peak to the 1496 IC. This value is not really critical - if the output of transmitter is not clean, adjust the output of this oscillator a small amount (if an oscilloscope is not available to set the output).

When using a DDS VFO, some have transmit offsets you can program. The 1496 IC (VFO INPUT) might be able to be driven by the DDS output. If not, take the output from between the 1st and 2nd VFO amp with a 2.2 pf cap or similar low value.

The DDS output will switch to the offset transmit frequency automatically with a signal from the switching section or even the oscillator switching section. Experimenting will be necessary here. Look at your spec sheet with the DDS to see what it needs to go to the transmit offset.

With the DDS (with transmit offset) you will not need to do the offset with the oscillator crystal pulling circuit except to set up the offset for normal operation.

For normal operation, turn off Mute, if used, and adjust the 85pf variable capacitor for maximum signal through the receiver.

The driver receives its signal from the output of the Bandpass Filter of the receiver, amplifies the filtered signal, goes through a resistor Pi pad to promote stability and set the output level, and then into the input to the Final amplifier usually rated at 5 to 10 Watts.

Since the stability of Final Amplifiers is so hard to achieve with homebrew methods (unless a PCB is designed and built), I choose to build a couple QRP amplifiers produced by hams for hams between 5 to 10 watts.

Almost all 50 Watt amplifiers need about 2 watts for drive which is easily achieved with these QRP amplifiers if I wanted more power. A 50 Watt amplifier I found inexpensive and easy to build Manhattan style was "A Broadband HF Amplifier Using Low-Cost Power MOSFETs, Part 1 and 2", by Mike Kossor, WA2EBY. It can be found in the QST archives.

Driver

I built three drivers to test before deciding on a 2N3904 broadband amplifier for a future kit design. The 2N5109 broadband amplifier is the best one to use for stability and maximum drive level to the final amp. Then I came across a third amp using two 2N5179s also advertised as very stable with flat gain across the spectrum used by the receiver. See the following pictures:

I replaced the 2N3904 with a 2N5179 for more gain at 18 MHz thinking the Ft 1 GHz of the 2N5179 would deliver a flatter gain curve.

This circuit come