Category: HAMsmithing

HAMsmithing – Simplex Repeater στο Κουτί!

Μετά από αρκετές σκέψεις, μετρήσεις και μερικά λαθάκια, η ψήκτρα στον Ασύρματο του Simplex Repeater, ένα Baofeng UV-5R, έτοιμη.

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Ξεκίνησα με μια ψήκτρα 100x100x18mm. Και με αρκετό λιμάρισμα κατάφερα να πετύχω το τελικό σχήμα. π.χ. η λοξή τομή στο μπροστινό μέρος έγινε για να περνά η μπαταριοθήκη γύρω από την ψύκτρα και να κουμπώνει.

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HAMsmithing – Simplex Repeater in-a-box, DONE

Well after a lot of pondering and measurements and some small mistakes the heatsink for the handheld is done and installed, in my Simplex Repeater in-a-box

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I started with a 100x100x18mm heatsink. A lot of filing for the multifaceted final project was done. i.e. the oblong cut on the front is there for the AAA battery case to pass over and lock. Let alone the radio’s back was also complex with three levels of.

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HAMsmithing – Collapsible Yagi Antenna. One Step Further

Today I made a step further in the Collapsible Yagi Antenna build. The coax connection module is finished, sans the hot melt glue that will help keep things together. Else the antenna beam would be done today. The thing is that this build must be prototyped and done form the inside out.

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On the right is the connections’ module with one of the driven elements placed, and a ring of PCV pipe to simulate the boom.

On the left is a simulation of the way the connection module was assembled. The 3mm bolts pass through the 16mmPVC pipe section. Then through the 20mm pipe section that has room for the nut.

You can also have a look at this pic. Stay tuned!

HAMsmithing – Collapsible Yagi Antenna Proof of Concept

Years go I started an ambitious project. to make a collapsible Yagi antenna that its parts would store inside a section of the cylindrical boom. After making a working model of it on a piece of 1×2 wood length I put it on the hold cos I was not satisfied with the way the driven elements would attach.

One step forward by and I have this.

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Motherboard Standoff/Risers, screws, ring terminals and nesting sections of PVC pipe.

I just hope it will not take a year more to finish it.

HAMsmithing – DIY Receive-only Antennas for RTL-SDR Dongles

So, after putting my cell phone in to use and running RTL-SDR radio listening apps, it was time to make 2 antennas for the dongle, the original one being Poor.

So I got me a coffee, nerves of steel, and started soldering on two MCX window Connectors for RG-174 cables.

The wire was sourced from a surveillance camera installation cable. It has 3 single conductors and a coax wire that seems to be RG-59 75ohm one.

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HAMsmithing – DIY Baofeng Programming Cables

I will guess that more than half the people that tried to program one of the Baofeng failed victim to the fake programming cable chip plague.

It happened to me also, and the process of finding a working driver, to no avail, killed my will to move further.

Enter the Baofeng T-1 mini radio and its programming cable that really worked!

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Since it terminates to a mini-USB connector I quickly formulated the plan to hacking it for my UV-5R and UV-3R radios.

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HAMsmithing – September 2017

Just as September was ending, I spent quite some time on small HAM projects.

1. I received the connectors and cables I ordered, so I sat down making cables for each DIY antenna I have.

2. I used some leftover PVC pipe to add 2 more sections in my collapsible antenna pole. Each section is 130cm (about 1.5 yards long), the wider my car trunk will allow. That makes for about 7 yards total height, just short of what one would need to make a sloping longwire antenna.

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