/hamradio/ - Electronics

Another argentinian here, I know that feel. Argentina doesn't have shit for electronics hobbyists.

There is always the option of homebrewing the rigs using widely available parts. Widely available parts an also be scavenged from junked equipment.
This guy is in Brazil so the parts availability could be at least partly comparable. And he uses tons of easy to get parts in simple designs.
http://py2ohh.w2c.com.br/trx.html

There are tons of other simple designs like BItx20:
http://www.phonestack.com/farhan/bitx.html

Listen to Soldersmoke and get inspired:
http://www.soldersmoke.com/

>>220
The bad thing about Argentina is that components are pretty bad quality, and the good ones are either hard to get or expensive.
So it's really hard to make a functioning rf device.

>>229
Those designs use so called "garden variety" parts that are easy to substitute and are cheap across the globe. You can also scavenge compatible parts from scrap electronics. Even the chinashit clones of a 2n3904, 2sc1815 or BC547 will work.

And 2n3904, 2sc1815 or BC547 can be substituted with each other more or less, just remember to check the pi nnout as 2sc1815 has a different one.
Resistors are resistors everywhere and caps are caps.

People have been building solid state rigs as long as semiconductors have existed, the current components exceed the specifications of all the old stuff.

Btw what do you mean by "good ones"
Mention parts numbers and "I'd like to build this particular project, but canot source these parts" and I'll make some suggestions.

>>232
There was some high frequency motorola transistor.
I can't find the datasheet right now… it was for some RF device

>>233
Found it!
MRF947T1

>>234
Finding old motorola devices ANYWHERE is hard as fuck. Either chinese clones or really expensive originals.
MRF947T1 seems to have an SMD version which is available from big distributors. You really don't have any local store/distributor that can order stuff from digikey/mouser/RS/newark/farnell/TME?

If you take a look, the good part about the designs I linked to is that they don't use those exotic hard to find RF transistors, but cheap commonly available general purpose stuff.

>>240
Nope, they 2 electronic device stores (which are really small) in my city don't offer that service.
Mail here is not like in the USA, so I can't order from the States for a low budget (chances are it'll never arrive).
And I have no way to make such an order from the capital city (where I imagine it'll be near impossible to find one)

>>241
That sure sucks.
I guess that's why dsigns like BITX20 ware developd in the first place. The Bitx uses no special parts, as it was designed as a simple rig for indian hams to build with localy available parts.
The only part hard to source in western parts of the world are the binocular TV balun cores used in the balanced mixers but one can cheat and use scavenged toroids from energy saving lamps.
The material used in those is wideband and usable for that, PY2OHH from brazil has also used them.

So take a look at the PY2OHH (and maybe alos the disgns of the dutch guy PA2OHH) and the orignal BITX20 site on phonestack.
You will notice that they don't use some hard to find transitors, but stuff more easily available.

That way you can use local suppliers.

You could also build shortwave converters for normal AM radios, that way you could shortwave DX on a budget and use the antennas for listening.