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QRPGuys Multi Z Tuner Assembly Manual
First, familiarize yourself with the parts and check for all the components. If a part is missing, please
contact us and we will send one. You must use
qrpguys.parts@gmail.com
to request a part.
Parts List
1 – QRPGuys Multi-Tuner PCB, 5 pieces
2 – S2, S3 - Slide switch – DPDT
1 – S1 - Slide switch – DPDT, 90º
2 – C2, C3 - Polyvaricon, w/shaft and hardware, 1 long, 2 short metric screws, and nylon spacer 3/8"L
1 – C1 - .1uF mono capacitor, marked 104
1 – D1 - Red LED w/clear lens
1 – D2 - 1N4148 signal diode, sm. glass, w/black band on one end
3 – R1, R2, R3 - 51 ohm 2W power resistor (green-brown-black-gold)
1 – R4 - 470 ohm resistor (yellow-violet-brown-gold)
1 – L1 - FT37-43 toroid core (black)
1 – T1 – T106-2 toroid core (red)
1 – 24" of 26AWG magnet wire
1 – 6' of 20AWG magnet wire
2 – #2 size control knob
2 - BNC PCB horizontal connector
2 – 8-32 x 3/4"L SS Phillips pan head screw
4 – 8-32 SS nut
2 – #8 internal tooth SS lock washer
2 – 8-32 SS wing nut
1 – 4-40 x 1/2" long nylon screw
1 – 4-40 nylon nut
1 – 3/8" diameter #4 nylon washer
4 – Round self-adhesive rubber foot
1 - 4-40 x 7/8"L SS pan head screw
1 - 4-40 SS nylon insert lock nut
Page 1 of 13
multi_assy_053019.pdf
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Summary of Contents for QRPGuys Multi Z
- Page 1 QRPGuys Multi Z Tuner Assembly Manual First, familiarize yourself with the parts and check for all the components. If a part is missing, please contact us and we will send one. You must use qrpguys.parts@gmail.com to request a part. Parts List 1 –...
- Page 2 First item to assemble is the PCB chassis. Even if you have done radio kit assembly before, please read through all the instructions before you start. This kit is a little different, in that the mechanical components are the part of the printed circuit board.
- Page 3 Soldering the chassis together: One of the physical properties of solder is that it contracts when it cools. Knowing this, we can allow for it. If two pieces of the pcb material are clamped 90° apart, and you apply solder at the joint, the joint will close about 1°-2°, no matter how well you clamp it, the PCB material will flex and you will end up with an 88°...
- Page 4 Now that the chassis is complete. Refer to the graphic below and the silk screening for the placement of the components. Install S1, so the operating lever passes through the front panel. Install C1, .1uF mono capacitor, marked 104. Install D2, 1N4148 signal diode, observing the black polarity band (cathode) location as shown in the figure below.
- Page 5 Install the clear lens LED protruding thru the front panel into the hole just over the S1 switch position. First, bend the leads as shown below 7/16’ from the back of the LED. The polarity must be correct. The short lead is “negative” and goes towards the right side of the chassis. The long lead to the left pad.
- Page 6 Solder L1 where indicated on the PCB, and centered on the screw hole. You will notice the tap hole is indicated, and is slightly larger in diameter to accept the double twisted wire. Install the toroid flush with the backside of the board. Do not elevate it off the board.
- Page 7 Poly varicon installation to kits ordered before 01/20/18 Prior to installing the poly-varicon variable capacitors the leads must be re-routed through the snap-on cover. The pictures below show the “as received” and “modified” condition. Carefully pry off the cover, bend the leads to the rear, feed them through the cover and snap it back on. There is a small tab, opposite the side with the leads, on the cover that matches the body of the poly-varicon for the cover to fit properly.
- Page 8 Polyvaricon installation to kits ordered after 01/20/18 As received Modified The polyvaricons as received, need a modification to allow the leads to reach the bottom of the device so it can be soldered to the pcb. If bent without modifying the cover, all the leads will not reach. Shown above is the un-modified polyvaricon as received.
- Page 9 Adjust the two trimmer caps on the back of each poly-varicon to their minimum value as shown below. Install the two polyvaricon capacitors on the inside of the front panel. Carefully feed the three leads through the board and secure the capacitors with the two short metric Phillips screws from the outside.
- Page 10 T1 assembly The next item to make and install is T1. This T106-2 toroid has a 16 turn center tapped primary, a 12 turn secondary, and another 6 turn secondary. We have supplied a 6 foot length of 20awg magnet wire for this purpose.
- Page 11 Start winding by positioning the tap halfway up the outside of the core and pass the right side winding thru the center of the core and the left side winding down thru the center of the core. Wind a couple of turns in each direction and compare it to the graphic and picture below. All three windings will be done with this method.
- Page 12 Cut another piece of the 20awg wire 13” long, mark the center at 6.5” with a marker and start with the center of the wire along one side of the tap, on the outside, and wind 3 turns in each direction for a total of 6 turns.
- Page 13 Schematic: Tuner usage The tuner is rated at 5W CW, 10 watts PEP max. and incorporates the N7VE LED absorption bridge circuit for sensing SWR. In the TUNE position, you cannot damage your transmitter caused by a high SWR. The worst your transmitter is looking at is a maximum of 2:1 SWR in the TUNE position. The LED is only showing reflected power.
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