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Type: Posts; User: brandon lind

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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.
  8. 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...
  13. 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,...
  14. 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.
  15. 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...
  16. 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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    Base Radios 10w is the minimum power at the lowest setting, a...

    10w is the minimum power at the lowest setting, a level which is controlled by a seperate resistor on the board rather than the extreme of the potentiometer. If the RF power potentiometer makes...
  19. Thread: New ham

    by brandon lind
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    Mobile Radios Does this mean you would like to use a crossband...

    Does this mean you would like to use a crossband repeater from your vehicle such that your (presumably UHF) handhelds are re-transmitted at the vehicle (on VHF) to others on the trail? This would...
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    You would not need a diode to see an RF signal...

    You would not need a diode to see an RF signal coming in on an antenna using an oscilloscope, oscilloscopes see AC just fine, no need to rectify it.

    Yes, the signals may be too small to see, and...
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    Cellular passive "repeater"

    Apologies for the lengthy story, this one is for people professionally acquainted with cellular sites...

    I recently went camping with the family, and of course, a few people really needed their...
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    I would ask if their current radios are licensed...

    I would ask if their current radios are licensed as abandoning an active license would seem unwise. What frequency do they currently run on VHF, a MURS color dot one or something licensed?

    Id also...
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    I would take the hard drive out of the 3.1 system...

    I would take the hard drive out of the 3.1 system and temporarily connect it to the XP system via IDE cable just like the XP systems HDD and use XP OS to copy the files to the other HDD then...
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    That does look awesome. Ive used automotive...

    That does look awesome. Ive used automotive ignition coils and microwave transformers before. I used to drive 12v ignition coils using 120v mains with a triac dimmer switch in series. On low, the...
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    Many thanks! I remember a scratch in the black...

    Many thanks! I remember a scratch in the black finish on the top of one if the insulators looked brown so maybe the top was bakelite. Hopefully you happen to cross paths with one, I've spent years...
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