diy

I have used my small loop antenna (which has a main loop and a coupling loop that can be tuned using a variable capacitor) with an AM radio receiver to receive MW broadcasts. However, the small loop antenna which was made by me was not working properly but when I connected a ferrite rod loop...

I need to know which type of antenna is best for scanning 3 MHz to 3 GHz signals using a RTL2832U SDR? What is the difference between using a telescopic and a discone antenna? Which is better?

I found this device (I think it's some sort of FM filter?) while cleaning out my fathers basement but have no idea what it is. I'm 100% sure it's his design/build but would like to know what it's actually used for if anyone knows.

I gotta say, when I saw the price tag of what it might cost to get back in to scanners, I was completely appalled by the idea that I'd be forced to fork over around $700 on average to a select few manufacturers that are able to decode P25-2/II and then I remembered I own SDRs! I picked up some...

got a Soundesign 4410 from the goodwill for 6 bucks. if the reception was good enough I could connect a big loop antenna for listening with an analog tuner. but now that I look at it, it doesn't have AM antenna connectors. only FM. tested it. reception sucks. I don't know why, it has a...

I have all the wiring set up and it starts to read through the port but eventually gives a read error when its complete, does anyone know if I'm missing anything or doing something wrong? Thanks in advance for any help

Grundig FR-200 made a new dial, it would look like this closeup need to print it out, laminate, and install still got some room at the bottom. don't know what else to put in there.

a while ago I read about how to convert an AM pocket radio to shortwave. it was a crude method, just wrap a another wire a few turns around the ferrite bar and attach it to the right points on the tuning system. usually done in communist countries where news of the outside world was forbidden...

Check out my RTL SDR pole i have in my office at work to listen to Mississippi MSWIN while im at work. I found a pole at home I had in some amazon portable photo studio in a bag that held a light. I have two omni antennas and one yagi antenna on this pole along with 2 RTL SDR dongles. I have a...

Hello Fellow Hams and Radio Enthusiasts, Hope everyone is doing well and enjoying the approaching Spring. Hopefully, this will be one of the last cold days for Missouri this year… Let’s See What Happens. I know there is eleventy thousand Prefabricated Dual Band VHF/UHF Antennas out there, but...

I Recently purchased a used KX-99 and needed to give it a once-over and couldn’t find the service manual until I came across this gem in the wild. If anyone needs it, here you go. Couldn’t upload the file directly since it was too big. Download

Hello! TR-9 is an open-source handheld transceiver. It works on 420..450MHz band. You can use it for both analog FM and M17. DMR should also be possible, but the voice coder is proprietary. Have fun building it. Reddit entry on TR-9...

Hi all, I know this topic has been posted many, many, times before, but much of the information is greatly outdated. Especially in terms of broken links, old info, etc. I am seeking some help that I would really appreciate. I recently just got an amplified charger base for my Minitor V. I am...

Ive seen multiple older (closed) posts about this particular scanner suffering from a front end overload/de-sense issue, and apparently ive been "had" on this one...Purchased cheap enough but it does in fact have the BCT15X deafness above the 10/11 meter bands. Nothing- not weather, fire...

Today i built my first antenna. A simple 1/4 wave ground plane with copper wire and a SO239 connecter. What i found very interesting was when i was complete and i started to check power and swr, that i was able to tune the SWR and in turn, adjust power out, while changing the angle of the radial...

Hello! I've been into simple hobby RF for a while, but I'm just recently getting into antenna design. I got into RF stuff when I bought my first SDR receiver (those cheap rtl-sdr USB dongles on ebay). They work from 24 MHz to about 1,7 GHz. I own some better SDR devices today, but I've mostly...

So before posting I've done my prerequisite and courteous 4 or 5 hours research before coming before the well versed and knowledgeable forum that is Rad-Ref. Sadly I couldn't find any information on the dilemma that I came across earlier today. So while running the streets of northeast Los...

Ok question, I am wanting to build a 2 meter j-pole and have looked at 100's of designs and have noticed that some have the short leg as the driven element and some have the long as the driven element. I am totaly confused. Please help.

I recently made a V-Dipole antenna using a set of rabbit ear antennas after looking at an article I found over at the rtl-sdr blog. Simple NOAA/Meteor Weather Satellite Antenna: A 137 MHz V-Dipole He was using it to rx weather satellite images, I figured if it is good enough for that maybe I...

Hello, I Have a Midland ML3215 Radio REV.E . Cant Find The Programming Cable Online. So Attempting To Make One. Any Know Where I May Find A Pinout / Cable Diagram So I Can Make One. Any Help Would Be Appreciated