Search found 270 matches
- Wed Jan 24, 2024 6:49 pm
- Forum: General Discussion
- Topic: What does your listening post look like?
- Replies: 12
- Views: 22434
Re: What does your listening post look like?
My listening post doesn't have a lot of high priced gear. The monitor on the left controls an inexpensive RTL-SDR.BLOG V3 dongle while the monitor on the right controls an Airspy RSP1A. The little monitor on the bottom is the control head for a Uniden SDS100 that is dedicated to local 24/7 P25 moni...
- Tue Jan 02, 2024 5:02 pm
- Forum: Questions & Advice
- Topic: G7RGQ antenna
- Replies: 0
- Views: 18601
G7RGQ antenna
Didn't build it, but checking infos it seems to work pretty well https://www.mictronics.de/posts/G7RGQ-Antenna-1090MHz/ it's a vertical antenna for the ADS/B (aircraft) band which, looking at the NEC models I found offers a gain of around 5dBi, looking at the pics at the above URL, the antenna seems...
- Fri Sep 22, 2023 5:41 am
- Forum: Questions & Advice
- Topic: Balun One Nine: cutting R1
- Replies: 14
- Views: 20925
Re: Balun One Nine: cutting R1
The antenna works great. That null is deeeeeep! I'd like to put it in the rotator I have on the roof. My question now is about the recommended 3-meter height: Would that be from the ground, or from the roof itself? Thanks for the great antenna design! from the "ground plane" if the roof a...
- Mon Sep 11, 2023 3:15 pm
- Forum: General Discussion
- Topic: A nice and simple regen receiver
- Replies: 3
- Views: 19957
Re: A nice and simple regen receiver
And here's another interesting circuit https://antiqueradios.com/forums/viewtopic.php?t=373629 it's a superhet based on the classic NE602, but with a difference, the LO is a regen stage based on the LM386 (yes, not kidding) SW Superhet with Regen IF.png that "hack" allows to improve the pe...
- Mon Sep 11, 2023 3:05 pm
- Forum: General Discussion
- Topic: The Belka (-DSP/-DX/-v3) appreciation thread
- Replies: 34
- Views: 61700
Re: The Belka (-DSP/-DX/-v3) appreciation thread
Late on this (have been on holidays :D) but I think that those folks are comparing apples and oranges and they just "shoot" stuff w/o even understanding what they're talking about; just consider that the Belka is a "self contained" unit, while a standard SDR needs a computer, let...
- Tue Sep 05, 2023 9:15 pm
- Forum: Questions & Advice
- Topic: Balun One Nine: cutting R1
- Replies: 14
- Views: 20925
Re: Balun One Nine: cutting R1
that one is the V2, no need to scrape anything it does not have the center tap even if the PCB shows it
- Tue Sep 05, 2023 4:16 pm
- Forum: Questions & Advice
- Topic: Balun One Nine: cutting R1
- Replies: 14
- Views: 20925
Re: Balun One Nine: cutting R1
notice that the V1 has the central tap, while the V2 doesn't so with the V2 there's nothing to cut
- Tue Sep 05, 2023 12:00 pm
- Forum: Questions & Advice
- Topic: Balun One Nine: cutting R1
- Replies: 14
- Views: 20925
Re: Balun One Nine: cutting R1
Thank you, Egil. I guess I should clarify my question: How do I physically cut the resistor? Score across it with a knife? see here https://swling.com/blog/wp-content/uploads/2021/08/balun_back.jpeg you just use a cutting blade to cut the circuit trace, then use a multimeter to check if the two sid...
- Fri Aug 25, 2023 10:11 am
- Forum: General Discussion
- Topic: A nice and simple regen receiver
- Replies: 3
- Views: 19957
A nice and simple regen receiver
If someone here likes fiddling with a soldering iron, here's the schematic for a regen https://www.aa5tb.com/regen.html https://www.aa5tb.com/regen2.gif I'm posting it just since I like how well it's designed while being simple, let me start from the input stage, the common gate JFET does multiple d...
- Sat Aug 19, 2023 3:33 pm
- Forum: General Discussion
- Topic: simplest antenna
- Replies: 0
- Views: 25692
simplest antenna
do you have some length of old coax sitting in a corner ? Do you need a "cheap and dirty" antenna to use at whatever location ... even to transmit ? Well, read on :D Pick your coax, be it RG58, RG59, RG6 or whatever. as long as you know its characteristic impedance, say 50.or 75 Ohm, now ....