Soldering Techniques for the ELR Receiver

Soldering Stations

Circuit Specialists SR-976N Adjustable Ceramic Heater

The SR-976N is an economical ceramic heater station from Circuit Specialists, Inc. Currently priced at $41.95, plus the tips needed and shipping.

This soldering station was highly recommended by many members on the QRP-L list. I have used this station and it works well.

I have found that it needs to be turned off when not in use to keep from burning out the tips. The tips need to be tinned when first used and efforts made to keep the tips tinned for long life.

Works very well for the ELR kit. Picture below:

Recommended tips:

Picture above shows all the available tips. The tips to order for the kit are the following:
976T-SB - .3mm
976T-B - .5mm
976T-BC - 1.0mm

All online orders over $50 come with a free gift. The one to get, if you are a beginner without a DVM, is the Digital Multimeter. See below:

I have received two of their Digital Multimeters and they work very well - great for using with the ELR.


Hakko 936 Soldering Station

The Hakko 936 is a high quality long life soldering station. The one shown here is from Kiesub Electronics and is sale priced at $78.79.

The main company online is HakkoUsa.

This station has excellent reviews on eham.net, is highly recommended by the QRP-L list members and can be found for $75 to $90.

Three tips I would recommend with this soldering station are the following:
900M-T-LB, .008" (.2r) 25mm length tip
900M-T-1.2D, .047" (1.2 mm) tip
900M-T-0.8D, .032" (.8mm) tip

Looking for other deals and places to order this soldering station is probably worth the time.


Weller WTCP/WTCPT Series Soldering Station

Reviews for this soldering iron can be found on eham.net

I have used a WTCP-T202 series for twenty years and can still find replacement parts and tips.

The eham.net reviews link to Cooper Hand Tools for ordering this station. One listed on the site was the WTCPT Soldering Station

I use the 700F degree tips in the same sizes as listed for the other stations. I find the 600 degree a little cool and the 800 degree a little hot. The 800 degree tips are great for dead-bug homebrewing and other heavy duty soldering onto blank PCBs.

The price varies quite a bit between suppliers, search on the internet for the best price. A used one is a great choice as they can all be repaired easily without a huge expense in replacement parts.

A WTCPT station at HMC Electronics is $127.00. HMC is a quality electronics supplier. Solder tips are reasonably priced and easy to find, right below the station on the same page.

I order four tips for this station: PTA-7 (or PTA7), PTP-7, PTS-7, and the PTO-7. These tips give a range of very small to standard size soldering tips for all the boards I build.


Soldering Techniques for the ELR Receiver

The picture above shows what the builder will be seeing most of the time when soldering the ELR - lots of wires sticking up at a 45 degree angle waiting to be soldered.

The parts in the picture are all the .01 capacitors inserted into Board 1, with a few soldered at the front.


Inserting the Parts into the Board

When parts with flexible leads are inserted through the board, bend the leads at a 45 degree angle to keep them in place when the board is turned over. Bent angle is not really important, but certainly enough so the part stays in place upside down.

Clip the leads after soldering. Point the leads away from your face when clipping the leads (save your eyes!). Most of the leads will shoot off like a rocket when clipping. Aim them into a trash can to keep them from landing all over your workbench and workroom.

Another technique is to hold the long leads with your finger when cutting. For shorter pieces, place your finger on top of the leads when cutting; they will fall on top of the board after being cut. A light touch is all that is needed, be careful not to poke or cut your finger.

Some leads will not bend: blue relays, 455kHz filter, 455kHz IF cans, MOSFETs, IRFU220, trimmer caps (2/8 and yellow) and the transformers (T4-6T and T1-1T). The 455kHz IF cans, MOSFETs, IRFU220, trimmer caps, and transformers will hold in place after inserted into the PCB.

The parts that will not hold onto the board (i.e., blue relays and 455kHz filter), add some solder to the soldering tip, then tack solder one pin to hold the part on the board. After soldering the other pins, go back and properly solder the tacked joint.

Common sense and creativity can also be used to get these parts properly soldered on the board. Any technique that holds the parts in place will be fine.


Soldering the Parts on the Board

The soldering on the kit boards mainly involves soldering small wires going through holes that are from about the same size to twice as large as the wire.

The solder needs to be on the wire, across the hole, to the ground plane or pad. The ground plane was designed to be as large as possible which makes it a very good heat sink. The pads were also oversized to make soldering easier and stronger for fixing mistakes and future experimenting.

The heatsink property of the boards is a slight problem, for the ground plane and pads sink a lot of the heat from the soldering operation and can prevent enough heat from reaching the leads of the components to get a good connect on the leads, especially large diameter leads or pins, for example, the 455kHz IF cans.

For quick, efficient soldering, apply solder to the component leads first, applying a small blob on the leads with the tip of the soldering gun with some additional solder added when touching the lead with the soldering tip.


Applying solder to the lead about 1/4" above the pad.

Then slide the tip and blob of solder down to the hole on the PCB, adding additional solder to get a good connection to the ground plane/pad. This ensures that the wire is soldered with a very good solder joint to the ground plane/pad.


Blob of solder shown on the pin before moving it down to the pad with the soldering gun tip.

Finishing the solder job by applying solder to the tip and ground plane covering the hole.

When learning this technique, put the solder tip about 1/4" above the pad and then move down to the hole. After some experience, you can move closer to the pad, always making sure the wire has solder on it before soldering to the pad.


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