SSTV images for testing radios / software and compare quality

SSTV is a form of encoding allowing You to transmit pictures over virtually any transmission medium that allow uncompressed human speech – starting from phone ending onย  SSB radios. It’s similar toย  “fax”ย  that was used over landline.

 

For testing i decided to record couple of SSTV sample audio files using different encoding to compare quality.

The slower (longer time) works better on noisy frequency like SSB.

Quicker one working perfect over AM/ FM.

Here are files for testing, You can decode them from “speaker” using Android smartphone and application called “Robot32” <- don’t let name mislead You, it decode all modes used here!

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Teardown of failed PoE adapter UBIQUITI UBI-POE-24-5

Here is example of unfixable PoE adapter.

It looks like capacitor leaked.

SignaLink – cheap alternative for poor PTT / AUDIO via USB

This was a prototype, i’m not proud of it but it was cheap and working.

 

What’s inside ABBREE 47cm SMA-Female Dual Band VHF UHF 144/430Mhz Foldable CS Tactical Antenna For Walkie Talkie Baofeng

Teardown to see what’s inside:

Teardown of RT4 Radio Tone battery 4600mAh for Zello PTT smartphone

This is good real capacity battery.

 

What’s inside SignaLink USB Interface – Tigertronics

When i was making jumper connectors to set up SignaLink i decide to take couple pictures and show You what’s inside.

Radio Tone RT5 Android Zello PTT mobile radio – quick look at car network radio

Quick testing of RadioTone RT5 Zello PTT mobile radio (it’s dedicated to use in car but in mine application will be a base station).
First impression is good, very loud and clear audio , remind me very much DMR Motorola DM4600 especial round mic connector plug… and i like it ๐Ÿ™‚
Keep in mind this is not a DMR radio, just android smartphone.

Vintage Psion Series 5 Palmtop Handheld Computer PDA with Epoc OS

Video and Pictures ๐Ÿ™‚

 

20.05.2018 SSTV pictures recevied on 11m 27.700Mhz

I decide to check if there is activity 11m (27.700Mhz) – and Yes, in couple of minutes i received following pictures and decoded using android phone.

 

why visual inspection is important – fixing current limiting – Simple soft start for high power mains device before it fail

Here is simple example why it is important to do visual inspection on Your electronic applications.

In this case i was able to spot leaking capacitor before it failed and create more expensive failure.

 

Guess why it failed… maybe it’s because they use 35V and silk screen stated 50V?

Of course i will go for 50V… higher the better.

Another example why not trust in Chinese stuff ๐Ÿ˜‰


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