Lead diameter .0185"/0.47 mm nominal
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73
Karl
KI4ZUQ

开云体育

Yep- got the caps and made the replacement, and saw no significant difference. 20m was slightly higher and 30m slightly lower but that could just have been from moving the toroids around :) Thanks - Sandy

You find any? I just woke up to this...so sorry! I am not getting any notifications on this page!? Need to fix that...

Let me know what you need, please!
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73
Karl
KI4ZUQ

I decided to make the swap on my early version QMX which had these caps reversed in position in the instructions. The easiest and safest way is to clip the leads and replace them. Anybody have 270pf and 180pf caps? They are parts C525 and C516 on the parts list and described as 50v, multilayered ceramic capacitors, NPO/COG Class-I RF dielectric. Sandy KB3EOF

This stuff plus the braid. Dab some of the flux from the tube, apply some of this low melt solder on the pads, swish it clean with the braid. Then put a little dome of the low melt on each pad. Hold the resistor with your tripod or a toothpick and toch each end with the iron tip. That low melt stuff stays molton longer than lead-tin.

There is a better way with solder paste and a heat gun but for one component this works. C509 on my QMX is on the board!

With 100 minus one 49.9Ω resistors you are a source! Need any 0603 capacitors? I got a lifetime supply! Har, har!
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73
Karl
KI4ZUQ

开云体育

I have regular paste flux, more like waxy ointment really and copper de-soldering braid. I have removed a few SMD resistors before using a doubled over two pronged wire on a soldering iron. The part usually flies away to never be seen again :). For installation I plan to clean the area with braid then put one small dab of solder on one pad and hold the SMD part in place with a tripod consisting of a chopstick tripod with a lead weight in the middle. Then carefully advancing the iron to melt the tack spot. The other side should be easy. As you can tell from the kludge I am also an SMD amateur ;) Sandy KB3EOF

Wow! I been trying to send you that link through out the day! Good! Good for you!

Do you have low temp solder used for removing SMD components and the special flux? I will hush if you are experienced at SMD 'cause I am the amateur!
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73
Karl
KI4ZUQ

开云体育

I am now (or will be in 2 weeks) the proud owner of 100 49.9 Ohm SMD resistors for the QMX radio. These are from . I'm willing to share this treasure trove with others :) Thanks Karl - Sandy KB3EOF

Please bear with me while I try to figure out this approval system!
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73
Karl
KI4ZUQ

开云体育

The size of the R522 49.9 Ohm SMD resistor on my QMX looks to be about 2mm long. Here is a snapshot of my board. It was only a small corner sheared off (don't ask) so it might still be good enough... we shall see when the BNC goes back on. 73 Sandy KB3EOF

Hi Karl - The size of the R522 49.9 Ohm SMD resistor on my QMX looks to be about 2mm long. Here is a snapshot of my board. It was only a small corner sheared off (don't ask) so it might still be good enough... we shall see when the BNC goes back on. 73 Sandy KB3EOF

What sixe is this R522 49.9Ω resistor?
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73
Karl
KI4ZUQ

Check regular email I sent you this morning but someone on here will have a resistor, I will bet! The BNC may be had from Hans to make sure it fits.
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73
Karl
KI4ZUQ

I managed to damage R522 on the lower right corner of my QMX while removing the right angle BNC connector. The resistor is labelled 68X or maybe X89 and is 49.9 Ohms. The BNC broke its center pin while I was removing a jumper cable (!!!). It broke right in the middle of the metal casing so had to be removed. My address is good on QRZ.com. I haven't heard of this happening before so it can't be that common. The BNC is flattened on the top and is not readily found at least by me. If anyone is willing to part with the resistor and/or BNC I can pay ;) Or if a mouser/digikey etc part number is known I can add to this list.

73
Sandy KB3EOF

Be sure to specify 1N4148s or 1N4148s.

That a typo or do I need to learn something? Har, har!
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73
Karl
KI4ZUQ

Fresh from China, still on the tape, 47V 1W Zeners, ?.

These aren't from my free pile like the 1N4148s, so I'll have to limit all takers to 5 each.

Address in private email to jim dot strohm at gmail dot com -- or give me a good call in QRZ.com I can send them to.

Be sure to specify 1N4148s or 1N4148s.

73
Jim N6OTQ?

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Jack, W8TEE