Dieter Vansteenwegen ON4DD
  • Member for 5 years, 4 months
  • Last seen this week
Measurement of antenna with VNA does not match its specs
5 votes

In addition to Phil's excellent answer, these specifications are in an "ideal" free space. Having your NanoVNA in close proximity to the antenna (even having the antenna lying on a wooden ...

View answer
Will the feds show up to my door? Is there a way to not get in trouble?
4 votes

I'll post this as a separate answer since it isn't meant as a thorough technical answer. I haven't thoroughly researched everything below and I figure one of the mods might decide to remove it. ...

View answer
Will the feds show up to my door? Is there a way to not get in trouble?
Accepted answer
3 votes

If you're looking for a secure but legal communications channel where you can do whatever you want but don't feel like spending more than 35 dollars, I'm afraid you will have a hard time finding a ...

View answer
Local Relay with static
3 votes

Could very well be someone who is bored and opens the repeater without actually transmitting anything useful. Happens on a lot of repeaters. You only need one person to do this to bother all users of ...

View answer
What is the easiest way to print data on qsl cards?
3 votes

Forgive me if this isn't the case, but isn't just taking a pen and writing the few things that need to be filled out much quicker than printing out labels? Unless you really make lots of qso 's and ...

View answer
What frequencies in 118–173 MHz can I transmit on without a license in Canada?
2 votes

In addition to the answer from @Marcus, I'd like to point out that (since you already have the radio) it's just a small step to get a basic ham radio license. Not familiar with the classes as used in ...

View answer
can I still hear a frequency if I can only tune in 5 kHz off?
2 votes

You might want to look in the manual of your radio. A lot of radios can be set up to tune in 6.25kHz steps, allowing you to tune to frequencies which are in between the frequencies you can tune to ...

View answer
Strong but unreadable signal received on 2m FM voice, transmitter less than 2km away. What could be the cause of the readability problem?
2 votes

Not an expert here, but since I don't see any answers yet these might be possible reasons: during the first leg of the trip, it seems like you had more or less line of sight. After that, there seem ...

View answer
Removing the whip on a 2m/70cm antenna makes no difference
2 votes

In addition to what Phil said, don't forget that a long (or just very lossy) feedline can mask problems by showing you a lower swr than if you would measure at the antenna directly. If the cable ...

View answer
Measurement/calibration error after OSL calibration on VNA
Accepted answer
2 votes

Seems like I was indeed wrong. The displayed trace displayed was Data/Memory (hence the /M in the top of the screenshot). After redoing the calibration and selecting Data for display, the unit is ...

View answer
Is it safe to live close to cellular antenna?
2 votes

I think the biggest risk you would take by renting such an appartment is terrible cellular reception. If your provider is one of the providers using the antenna on top of your building, that would ...

View answer
Yaesu FT-70DR Earpiece
1 votes

Going by the pictures (not much other information to go by), it seems the breakout cable has a standard headphone Jack and a smaller plug for the microphone. That seems a standard configuration. I ...

View answer
RF PCB Design Difference Between Controlled Impedance Track and Impedance Matching Circuit
1 votes

To add to Phil's answer: if your antenna, source and transmission line (the impedance controlled traces) are all of the same impedance, you don't need an impedance matching circuit. Most common ...

View answer
Can I contact the International Space Station using my Baofeng UV5R?
1 votes

You definitely can, but would benefit a lot from a dual band directional antenna. There are plenty of examples of self-built yagi antennas that are perfect for satellite work (such as https://hackaday....

View answer
Testing for 'Bad' Coax
1 votes

In addition to the above tests, and if: the coax is of some reputable brand and has type markings on the jacket, you have access to a LCR meter, the cables are of sufficient length, you might want ...

View answer
What to use to build a tower here in the Philippines?
Accepted answer
1 votes

Have you thought about how you would get the signal from the towers (that seem to be placed rather at a large distance) to your shack? How will you compensate for the transmission losses? As for your ...

View answer
How to tune an FM transmitter to a specific frequency?
0 votes

As buying everything pre-made would take away the fun of building something yourself, I'd propose to look into kits which you can at least assemble yourself. The transmitter is the one on which legal ...

View answer