Frequency Stabilizer Construction
for the Salmon Pink Colored Boards
Dated 10-1-2000

The stabilizer first used a relay mounted on the VFO toroid to control frequency. This is why the output of the stabilizer is marked "Relay". The current draw of the relay caused problems with overheating the output of the CA3140 in the stabilizer.

The relay was replaced with MV2104 varicaps mounted on the main tuning capacitor. This second method worked very well but the stabilization range varied quite a bit between the open and closed positions of the main tuning capacitor.

A third method of connecting the stabilizer to the VFO has been incorporated. Varicaps are inserted between the ground ends of the 8pf ceramic trimmer and the 47pf NPO capacitor next to the 10.455 relay. This method gives an even stabilization range thoughout the entire range of the main tuning capacitor and resulted in excellent performance.

The VFO coil is wound with 19 turns when using the stabilizer. If you wind it with 18 turns, just pull the windings together to get the 14 MHz VFO within range of the 8pf ceramic trimmer.

The varicap on the 8pf trimmer raises the 14 MHz frequency 300-400 kHz, so the VFO coil is wound with 19 turns, instead of 18 turns without the stabilizer.

The following procedure has resulted in excellent performance of the stabilizer. Most tests have indicated stability within + or - 1Hz stability.

The only difficulty is removing the 47pf capacitor after the main tuning capacitor has been installed. Do not remove the main tuning capacitor if you have problems with the 47pf cap. You can burn off the capacitor from its leads and add a new one. Email me if you need a capacitor or help. See instructions below.

Varicaps are inserted between the ground end of the 8pf ceramic trimmer and the 47pf NPO capacitor next to the 10.455 relay.

Either a MV2104 or a H66 (a 50pf varicap) can be used at the 8pf trimmer. All the new stabilizer kits will have one MV2104 and one H66. The MV2104 is used at the 8pf trimmer and the H66 is used with the 47pf NPO capacitor.

Readjustment of the toroid windings will be necessary to get the 8pf trimmer in the 14 MHz range of the VFO. The addition of the varicap will raise the 14 MHz frequency and bringing the windings closer together will be necessary.

When lifting the 8pf ceramic trimmer, place it at an angle where it can be adjusted easily. Then use plenty of melted wax to secure the trimmer and connections so they do not vibrate or move when adjusted.

The cathodes of the varicaps are soldered to the capacitor and the anodes are soldered to ground.

A 100K resistor is soldered to the junction of the capacior/trimmer and the varicap. The other ends of the 100K resistors are tied together and then wired to the output of the stabilizer (marked "Relay").

See the pictures below for details:

Unsolder the ground end of the 8pf ceramic trimmer and the 47pf NPO capacitor.

Be very careful with the 47pf cap - it is very fragile. Remove the solder on the bottom side of the board first. Do not pull on the capacitor while applying heat or the lead will come out of the capacitor. Use needle nose pliers to grab on the lead rather than the body of the capacitor.

If you are retrofitting a built receiver the picture above shows the location of the ground lead of the 47pf capacitor between the tuning capacitor and the PCB.

The lead can be reached with a long, narrow soldering tip. Or by clamping needle nose pliers on the top of the lead, heat the lead on top of the board until it unsolders.

If you cannot reach the bottom ground of the 47pf capacitor, you can burn the cap of its leads and solder in a new one. See below:

The yellow arrow points to the footprint of the 47pf capacitor that has been burned off its leads. Place the soldering iron tip on the capacitor body.

The capacitor will begin to melt. Then pull up with the tip and the capacitor will come off its leads.

Then solder the anode of the 50pf varicap to the ground side of the capacitor - bottom lead in the picture above.

Next, solder a new 47pf capacitor to the cathode of the varicap and the top lead.

The arrow points to the connection where a 100K resistor lead will be soldered.

The H66 varicaps do not have a symbol on them indicating the anode/cathode of the part. Use the above picture to locate the correct pins. The pin pattern for the H66 is the same as the MV2104.

Solder the varicaps between the trimmer/capacitor and the original ground connection. Be sure you have the cathode connecting to the trimmer/capacitor.

Solder a high megohm (equal or greater than 2 megohm) resistor to the ground connection shown on the board. This will provide a standoff to solder the 100K resistors from the varicaps.

Solder the 100K resistors to the junction of the varicap and trimmer/capacitor. A high megohm (above 2 meg) 1/4 watt resistor is mounted in a ground hole near the edge of the board to provide support for the other ends of the resistors and a tie point for the wire going to the output of the stabilizer.

The output of the stabilizer is marked "Relay". Connect the cable to the stabilizer first. If the connection on the PCB is made first it is difficult to get to this connection.

Note the ground and center wire connections. There is a "Gnd" label next to the Ground hole. Or solder the shield underneath the board on the ground plane.

Connect the center wire to the 100K resistor junction. Solder the shield to the ground plane underneath the PCB.

After the PCB is mounted back on the spacers, melt some wax over the ceramic trimmer and over the 47pf capacitor to keep them from vibrating.

The wax gives support to the ceramic trimmer so adjustments can be easily made. Check to me sure you have easy access to the trimmer with an adjustment tool before you wax it down.

Adjustments to the ceramic trimmer will need to be made with an insulated tool. The trimmer adjustment screw is no longer grounded.

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Picture shows the wax applied to the ferrite choke, VFO coil, 8pf ceramic trimmer, and the 47pf capacitor. This provides a firm mounting and a stable VFO.

Trim wax off the top of the ceramic trimmer before it cools or anywhere else to prevent damage to the parts.

____Start with the resistors and capacitors. Picture You will not install a 2 meg resistor that will be left over in some kits. Be sure to get the 4.7K in the right footprint. If it gets in a 4.7 meg spot, the integrator will not work.

Be careful mounting the 7805. The front of the 7805 faces to the outside of the board. The bold line of the footprint indicates the location of the heat sink, the back of the 7805. Be sure to get good solid solder joints at the pins of the regulator to the PCB.