Search found 25 matches

by VE3EAR
Tue Mar 10, 2020 2:45 pm
Forum: Antennas
Topic: DIY QFH for NOAA, pvc and copper tube plans, but smaller diameter copper?
Replies: 2
Views: 2182

Re: DIY QFH for NOAA, pvc and copper tube plans, but smaller diameter copper?

But the diameter of the elements shouldn't matter much if the lengths and angles are preserved, right? That's right....the thicker elements may have a slightly wider bandwidth, but with the design of the QFH being what it is, the bandwidth is already taken care of by the two loops being of differen...
by VE3EAR
Tue Mar 03, 2020 3:05 pm
Forum: Antennas
Topic: Static shock while connecting ground-wire to radio?
Replies: 10
Views: 5623

Re: Static shock while connecting ground-wire to radio?

Hi Jacob....I looked at the device you provided the link to and it appears to be just what you need to protect your receiver. I understand your reluctance to build your own, so purchasing one is the option for you. The two units I built used the toroid cores removed from computer SMPS and about 5 fe...
by VE3EAR
Mon Mar 02, 2020 2:15 pm
Forum: Antennas
Topic: Static shock while connecting ground-wire to radio?
Replies: 10
Views: 5623

Re: Static shock while connecting ground-wire to radio?

I would be wary of connecting the antenna to your Airspy receiver directly, as it could easily be damaged by the "static" electricity. I recommend that you make up an isolation transformer, AKA a galvanic isolator, to protect your receiver. You can make one from a toroid core removed from a computer...
by VE3EAR
Fri Feb 21, 2020 3:34 pm
Forum: RTL-SDR Discussion
Topic: Received Audio
Replies: 1
Views: 2364

Received Audio

I'm curious to know what others are doing with the received audio from their SDRs. Are you simply using the built-in speaker(s) of your computers, or perhaps headphones? Personally, I found the built-in speaker lacking in fidelity and yet I didn't want to wear my Sennheiser 'phones just for casual m...
by VE3EAR
Thu Feb 20, 2020 2:44 pm
Forum: Troubleshooting Help
Topic: Dongle unusable using long wire antenna and 9:1 ballun.
Replies: 5
Views: 3170

Re: Dongle unusable using long wire antenna and 9:1 ballun.

How long is this long wire? You may be overwhelming the front end of the dongle. Another option to try is to get a filter that attenuates the AM broadcast band, while passing any signals above.

73, Bruce, VE3EAR
by VE3EAR
Thu Feb 13, 2020 4:08 pm
Forum: Antennas
Topic: Antenna for 260 mHz. Satcom
Replies: 5
Views: 2345

Re: Antenna for 260 mHz. Satcom

How durable is it? I use the Trivec behind the Glass. I don't quite understand your question. The materials and construction method are both robust, so I expect it will easily handle anything that mother nature can throw at it, except perhaps a tornado, LOL. What is Trivec behind the Glass? 73, Bru...
by VE3EAR
Thu Feb 13, 2020 2:37 pm
Forum: Antennas
Topic: Antenna for 260 mHz. Satcom
Replies: 5
Views: 2345

Re: Antenna for 260 mHz. Satcom

I didn't bother to take any pix of the conversion, since I built a much better antenna for the purpose. Look for my posting titled "A crossed Yagi for 255 mHz." for a pix and details.

73, Bruce, VE3EAR
by VE3EAR
Sun Feb 09, 2020 12:41 am
Forum: Antennas
Topic: Question regarding loop designs
Replies: 8
Views: 2344

Re: Question regarding loop designs

What frequency or range of frequencies are you wanting to listen to? Perhaps an active antenna, like the PA0RDT mini whip would meet your needs. It could be extended away from the grate on a wooden or plastic rod, and use the grate as its "ground" reference. You can find details of it here: http://w...
by VE3EAR
Sat Feb 08, 2020 2:44 pm
Forum: Antennas
Topic: Question regarding loop designs
Replies: 8
Views: 2344

Re: Question regarding loop designs

It will be around a vertical square metal grid which is about 1x1 meter (3x3 feet) in size (So 1 square-meter (9 square-feet)) Just what do you mean exactly about a metal grid? Having any metal close to an antenna is not a good idea, as it is very lossy. A few more details on what and why of the me...
by VE3EAR
Sat Jan 25, 2020 3:44 pm
Forum: Other SDR Devices
Topic: Airspy HF+ Discovery
Replies: 17
Views: 5508

Re: Airspy HF+ Discovery

I've had my Discovery for over a week now, and I'm continuing to be amazed at how well it works. The lowest frequency I've received a signal on was a 24 kHz. transmission from NAA, Cutler, Maine. and the highest was a 10 meter CW station. I'm using the Gqrx SDR software in my Mac with OSX El Capitan...