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Type: Posts; User: brandon lind

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    Homebrewing is a great option for linear supplies...

    Homebrewing is a great option for linear supplies if you have the money and the time. I personally like the 2N3055's. If you order extra, those make great audio amplifiers too!
  2. Both of us started with a spring but took them...

    Both of us started with a spring but took them off. These antennas are so heavy that they get to swinging around a ridiculous amount using the springs that came with them. I am sure there are...
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    Update: I know this thread is old but I finally...

    Update: I know this thread is old but I finally found the original source code for this on a failing hard drive I had tossed in a drawer. The entire visual studio project folder is here for the...
  4. Thanks for the reply. If it was in response to my...

    Thanks for the reply. If it was in response to my former question, the antenna is already installed. It is 102" mounted on a piece of flat stock designed to attach between the roof rack rails of a...
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    I don't know much at all about this but I've...

    I don't know much at all about this but I've tried something similar myself with no luck. The first answer on this link is the reason I have come to accept.
    ...
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    I'll be adding the skywave linux ISO to my usb...

    I'll be adding the skywave linux ISO to my usb stick. I have a 256GB thumb drive partitioned into two 128GB parts, one NTFS and the other Ext4. I have Easy2Boot on the NTFS partition with all my...
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    Motorola programming and UART

    Does anyone know the programming protocols Motorola used on the old SM50 and GM300 radios? I ordered some of those USB to UART modules and have been having a ton of fun making them talk to each other...
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    downloading it now, thanks for pointing it out!

    downloading it now, thanks for pointing it out!
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    Update: I took a closer look with the...

    Update: I took a closer look with the oscilloscope and there is a ton happening in the kHz region. There are 24 bit data streams running at a rate of about 1.6Mbps separated by about 45microsecond...
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    Bias Tee Mystery

    I recently bought a set of 5MP wired security cameras (Night Owl brand) and wanted to have a camera at the end of the driveway. It is about 200 feet. I homebrewed up a set of bias tees to run the DC...
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    Base Radios The particular model meter you have can only...

    The particular model meter you have can only check diodes up to 2v. Therefore, I doubt it would provide enough voltage to charge the gate capacitance enough to turn on the mosfet. Meters that run on...
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    Base Radios ...and be sure to wear a grounded wrist strap...

    ...and be sure to wear a grounded wrist strap when putting the new mosfet in. That thin layer of oxide can be damaged by anything over (for that model) 50v. That means a static discharge from your...
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    Base Radios My multimeter has 2 functions on the diode...

    My multimeter has 2 functions on the diode setting. By default it is measuring capacitance until I press the select button and change it to diode. Because I am unfamiliar with your particular meter...
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    Base Radios Mosfets can usually be tested with a multimeter...

    Mosfets can usually be tested with a multimeter by using the diode setting. You will first need to take a look at the datasheet...
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    Correct. A dedicated ground rod with the shortest...

    Correct. A dedicated ground rod with the shortest possible run of ground strap for your radio stuff is ideal.
  16. Thread: Clueless!

    by brandon lind
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    Download a scanner app for your phone on google...

    Download a scanner app for your phone on google play. Most, but not all, share resources and often include police, ems, schools, ham repeaters etc. How does that work??? People are paid to connect...
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    I agree with 5B4AJB in that you should avoid...

    I agree with 5B4AJB in that you should avoid using the AC mains ground. So many problems can occur. All that wire in the wall can act as an antenna and the loops can resonate. You will be picking up...
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    Apologies, i run windows 7. On windows 10, right...

    Apologies, i run windows 7. On windows 10, right click on desktop and select display settings. In the area that shows brightness (for laptops) and scale and layout, scroll down with the mouse roller....
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    Right click on desktop, select "screen...

    Right click on desktop, select "screen resolution, click the second monitor or select it in the drop down menu and change it from "duplicate" to "extend the desktop"
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    Mobile Radios I would be more concerned with asking your radio...

    I would be more concerned with asking your radio to transmit through a filter unit it wasn't designed for. I have a big box of old 38-42MHz commercial Motorola radios. They are not being used on 6m...
  21. Thread: NanoVNA

    by brandon lind
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    Its not quite that simple. If I wanted to use my...

    Its not quite that simple. If I wanted to use my nanoVNA on 75ohm coax and calibrate to the end of that coax, I cannot simply attach a 75 ohm load + open + short, hit cal and be done. If I did that,...
  22. Thread: NanoVNA

    by brandon lind
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    I wish it had the option to calibrate to 75ohm....

    I wish it had the option to calibrate to 75ohm. Also, there is a delay feature that doesnt work on mine. Overall, for the price, i am very happy with mine and use it often.
  23. Your easiest solution is to put up a 10MHz...

    Your easiest solution is to put up a 10MHz antenna and use the WWV time signal.

    If you insist on building one, will it be for FM or AM?

    Edit: Take a look at the Bipolar Transistor Cookbook (By...
  24. I think its -125 MHz (make sure you make it...

    I think its -125 MHz (make sure you make it negative).

    Also, and irrelevant, i noticed on mine that with the ham it up set to passthrough, the converter still needs usb power to pass RF through.
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    Whats up with the second bracket? All the other...

    Whats up with the second bracket? All the other pictures online show the antenna without the added support. That appears to be a metal bracket insulated with electrical tape and zip tied to the...
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