XPost: rec.radio.amateur.moderated

Amateur/Ham Radio

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ICOM announces development of 2.4 and 5.6 GHz amateur radio equipment

Posted: 10 Dec 2021 05:57 AM PST https://www.reddit.com/r/amateurradio/comments/rd97dr/icom_announces_development_of_24_and_56_ghz/

submitted by /u/manero64
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Icom 7300 Time correction Software

Posted: 10 Dec 2021 04:05 PM PST https://www.reddit.com/r/amateurradio/comments/rdmijr/icom_7300_time_correction_software/

submitted by /u/Naturist02
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9:1 unun crashed

Posted: 10 Dec 2021 11:45 AM PST https://www.reddit.com/r/amateurradio/comments/rdgt3n/91_unun_crashed/


I recently built a 9:1 unun, attached it to a tree about 4 up, attached a
58 wire with the hight of the other end about 17 on a squid pole. It worked great, swr in a workable range at 6, 10, 12, 15, and 20 meters. Then, all
of the sudden, there was no reception back in the shack! I thought it might have been a bad antenna connection, so I strengthened it and checked all soldering connects - still no reception in the shack. Why would the unun
quit working? Or, what might have gone wrong? Other antennas coming into
the shack worked fine. submitted by /u/dbgreen
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2m/70 Portable Yagis

Posted: 10 Dec 2021 05:48 PM PST https://www.reddit.com/r/amateurradio/comments/rdokto/2m70_portable_yagis/


What brands of 2m/440 portable yagis are people using for portable ops ? submitted by /u/Naturist02
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Anyone using hampi image on a Raspberry Pi 3 for SDR etc? Trying to figure
out if it should be this slooooooowwwwww....

Posted: 10 Dec 2021 03:14 PM PST https://www.reddit.com/r/amateurradio/comments/rdlgdz/anyone_using_hampi_image_on_a_raspberry_pi_3_for/


as stated in the title, I’ve set up an old pi 3B with a fresh hampi image
to tinker with an old nooelec SDR.
It runs slowly. Like really, really slowly. I’ve used cubic SDR because that’s the one that was recommended for my dongle, and it’s anywhere from frustrating to almost unusable, between input lag and slow response in the
SDR, and everything else. Even just web browsing seems pretty taxing on
this little thing, to the point where Id rather use the tiny phone screen instead for most things.
So, I’m just wondering if I’m just running into the limitations of the pi? Or have I may be messed up some settings somewhere?
And yes, I disabled BOINC (although I believe that only runs as a
screensaver). submitted by /u/LongjumpingEnergy
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[OC] Getting Amateur Radio propagation data at home

Posted: 10 Dec 2021 05:00 PM PST https://www.reddit.com/r/amateurradio/comments/rdnlw7/oc_getting_amateur_radio_propagation_data_at_home/


For some time now Ive been discussing the potential of weak signal
propagation and its ability to create a live map from the data that your
own station transmits. There are several systems in place that show a map
of where and when your station was heard in the past little while. Using
200 milliwatts, Ive been transmitting a WSPR or Weak Signal Propagation Reporter beacon on 10m for the past few weeks.
At the moment, the furthest away my beacon has been heard is 13.612 km
away. Thats an 0.2 Watt signal heard on the other side of the planet, on
10m. As distance goes, its a third of the way around the globe. I must
point out that theres no way of knowing if this signal travelled the short
path or the long path.
If youve heard those terms, short and long path but were wondering what
they mean, heres how it works. If I get on my bike at my QTH in Perth in
VK6 and peddle East until I hit Sydney, Ill have crossed Australia, taken
about 184 hours and travelled about 3.746 km. Thats the short path. If I
head West instead and start swimming, visit Cape Town, Buenos Aires and Auckland along the way, Ill have travelled much further, still made it to Sydney, but taken the long path.
Radio waves can do the same. Depending on propagation, a signal might take either the shortest route, or go in the opposite direction and take the
longest route along the great circle between two stations.
Im mentioning this because WSPR doesnt tell you if its one or the other and
if youre using a vertical, it could be either. Even directional antennas
might receive a signal from unexpected directions.
Using one of the mapping tools, wspr.live, I extracted all the sightings of
my callsign and all the reports that Id made from my receiver. It shows
that my newest transmitter has now been heard by 11 stations across three continents.
Those numbers are just the beginning. I wanted to see on the map where
these stations were, so, during the week I built a proof of concept world
map that I used to visually show the four character Maidenhead grid squares that my station was heard in. I also had a look to see which stations Id
heard over the years and where they were. In all, 771 different stations
are in my log, either as a receiver or a transmitter.
N4WQH heard me on 40m, 18.832 km away when I was using 5 Watts. My station
has heard, or has been heard across 331 different grid squares. Theres
reports across some remote parts of Australia, Japan, India, South Africa, Europe, the United States, several across the Pacific and even a few in Antarctica.
I wondered how many of the worlds grid squares have actually been activated
and which station was heard the furthest and how much power was used. Those numbers will have to wait for another day. I initially started using
wspr.live which has a neat way of allowing you to embed an SQL query as
part of the URL to download the output.
I was getting some interesting results, so I thought, rather than hammer
this lovely resource with my questions, I should download the raw data
instead. So I did. Well, I am. Still. Its big.
As of today, theres 166 files, taking up 60 GB of compressed data, with
over 3.5 billion reports.
The first spot in that data goes to N8FQ who heard WB3ANQ on Monday, the
17th of March, 2008 across 911 km on the 30m band transmitting with 28 dBm,
or about 630 mW, reporting a signal to noise ratio of 1 dB.
Using preliminary data to get started I mapped all the activated squares,
each shown as a red box and saw that my entire map was red. At that point I figured that either Ive got a bug in my code, or something else is going on.
To give some context before I share what I found, a Maidenhead locator
consists of a combination of letters and numbers. For four letter grid
squares, theres a grand total of 32.400 different combinations, running
from AA00 to RR99. Theyre 2 degrees wide and 1 degree high and their width depends on where on the planet they are. At the equator its about 222 km
wide and 111 km tall, at the North and South pole, its 0 km wide. If you
travel between two squares, you might have to move a meter, or the entire
width of a grid square.
Among the report, I found stations who had activated more than one square. Thats fair enough, you can move your station and start making noise where
ever you like. I found stations with activations across more than a
thousand different squares. Before I start pointing the finger, I will
mention that if you attach a WSPR beacon to an aircraft, or a balloon, you
can legitimately activate plenty of squares.
When you set-up a WSPR transmitter, youre required to manually enter the locator and mistakes happen. Theres plenty of records with invalid
Maidenhead locators, typically shown instead is a callsign. Then there are stations that pick desirable locators. This manual entry is also true for
the power level and even the callsign, so Im not outing these stations
here, since its entirely possible that the callsign shown doesnt actually relate to the transmitter or the licensed amateur.
What does all this mean?
It means that the information in the WSPR database cannot be trusted. I
suspect it also means that the data used to lodge FT8 contacts across the planet can probably also not be trusted. It means that any propagation data youre deriving is likely contaminated by misreporting, deliberately or not.
As a community, if we want to use this for actual measurements, well have
to figure out how to make this a trusted resource, because the information
that WSPR can bring to propagation is in my opinion extremely valuable.
I would love to hear your thoughts on how we might fix it.
Im Onno VK6FLAB
TL;DR This is the transcript of the weekly Foundations of Amateur Radio
podcast - for other episodes, see http://vk6flab.com/ submitted by
/u/vk6flab
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mag mount base to 2m antenna

Posted: 10 Dec 2021 08:59 AM PST https://www.reddit.com/r/amateurradio/comments/rdd2wb/mag_mount_base_to_2m_antenna/


Hello, I have a old mag mount base (from CB) that I would like to
re-purpose for 2m usage.
the top of the base has a screw that goes accept PL-259 connector.
If I take 1/4 wave length of wire, solder it to the connector and screw it onto the base, will that work?
Or do mag-mount antennas work differently than I imagine?
Thank you. submitted by /u/tauchw
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HF/VHF/UHF Go Bag Tour - Hazard 4 Plan-B Sling Bag / Icom IC-7000

Posted: 10 Dec 2021 11:56 AM PST https://www.reddit.com/r/amateurradio/comments/rdh2es/hfvhfuhf_go_bag_tour_hazard_4_planb_sling_bag/


I am so impressed by this bag, just wanted to share so others are aware of
it!
https://www.youtube.com/watch?v=KdlStyzZXks&t=327s submitted by
/u/Shirkaday
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You are my people it appears

Posted: 10 Dec 2021 09:02 AM PST https://www.reddit.com/r/amateurradio/comments/rdd5qp/you_are_my_people_it_appears/

submitted by /u/FlummoxedOne
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Need help to identify those interferences

Posted: 10 Dec 2021 07:20 AM PST https://www.reddit.com/r/amateurradio/comments/rdaxfh/need_help_to_identify_those_interferences/


Hi,
This week I performed a site survey analyze on a factory and i found some
weird interferences on the 2,4GHz an 5GHz band, but mostly on 2,4GHz around channels 1 and 8.
Seems related to some electrical sources to me because of the stable looks
of it, but Im not an expert, so I would like to have your opinions on it
guys.
Many thanks https://preview.redd.it/gnkfo09igq481.png?width=2047&format=png&auto=webp&s=8b4db8e7d2a770be862b973d8b7d5107673793f3
https://preview.redd.it/ahvrv69igq481.png?width=2047&format=png&auto=webp&s=56c9563b06aa7f9eb7f59236384ce8839cc83574
https://preview.redd.it/ixhwpb9igq481.png?width=2048&format=png&auto=webp&s=dc77633dd7cc831ad59958ec4bbe2a9e301e16c2
submitted
by /u/Drank0
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