Ham Radio

770 readers

1 users here now

This community is for anything related to ham/amateur radios

founded 3 years ago

MODERATORS

[email protected]

Questions from a newbie ham (lemmy.ml)

submitted 5 months ago by [email protected] to c/[email protected]

3 comments fedilink hide all child comments

Right, so this is the situation: I still haven't obtained my license here in Brazil, but I already have a Baofeng DR-1801 HT that can connect to dmr networks. Therefore I haven't transmitted yet. But I'd like to clarify some doubts:

When I get my license, even in C-class in Brazil, I will be allowed access to some frequencies in 40-10m bands. Should I get a low power QRP transceiver (e.g. uSDX) or go for an used rig from known brands?
It's almost impossible to find a transceiver project with a power rating greater than 10w. What would be the difficulty of, say, copylefting the schematics of an ft-7b?
Can I really use a wire thrown over my house (of course, with baluns and stuff) as a monopole antenna or that's just myth?

you are viewing a single comment's thread
view the rest of the comments

[–] [email protected] 3 points 5 months ago* (last edited 5 months ago)

1 up to you. Be careful with spending untill you know you will go further in the hobby. But if you take that advice. You'll be in a very small group of hams. Most of us have bad buys.

2 don't. Not at this stage. Building an amplification circuit is way more complex then it looks.seperation and filtering of feed back in the system is a complex task not advised for a beginner. Sort of why projects don't include it. It drastically limits the people able to take on the project. Honestly a 2nd external amplifier project. Or purchased amp. Would be a better goal with way less risk of harm to others.

3 yes but other things then the house may be better. I use a 160m EFHW on my canal boat. With an adjustable unun 64/49/16/9:1 this and a mat auto tuner allow me to use all hf frequencies with low swr. I simply run a 10m pole off the side of the boat. And run the wire into the trees.

Remember anything like this works. But it is still going to be a compromis. But that is true of most multi band antennas. They will be better at some bands then others.

I'll also warn you. What you describe is refered to as a random wire. But is not random. To work with a 9;1 unun it actually has to not match any frequency used. If it is close to half or quater wave on a frequency. It will need a much larger unun. Hence mine going to 64;1

If you look online you will find recommended lengths. And a list of bands they will work on.

But for portable work. I found the mixed unun ability much more flexible.