XPost: rec.radio.amateur.moderated

Amateur/Ham Radio

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Got a tattoo yesterday

Posted: 25 Jan 2022 08:00 AM PST https://www.reddit.com/r/amateurradio/comments/scgyrl/got_a_tattoo_yesterday/

submitted by /u/gladizh
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Finished building my portable rig just in time for Winter Field Day.

Posted: 25 Jan 2022 11:38 AM PST https://www.reddit.com/r/amateurradio/comments/sclywv/finished_building_my_portable_rig_just_in_time/

submitted by /u/Complex_Impressive
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Its not a bad day to be on 10 meters apparently.

Posted: 25 Jan 2022 12:36 PM PST https://www.reddit.com/r/amateurradio/comments/scn9vc/its_not_a_bad_day_to_be_on_10_meters_apparently/

submitted by /u/DC5932
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Ukrainian, Russian radio enthusiasts battle over alleged Russian military frequency - UVB-76

Posted: 25 Jan 2022 05:36 AM PST https://www.reddit.com/r/amateurradio/comments/scdx45/ukrainian_russian_radio_enthusiasts_battle_over/

submitted by /u/hoverbeaver
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All Russian webSDR programmatically blocking "the buzzer" (4625KHz), 2125-2136KHz, 2710-3920KHz to outside world.

Posted: 25 Jan 2022 11:25 AM PST https://www.reddit.com/r/amateurradio/comments/sclnva/all_russian_websdr_programmatically_blocking_the/


After reading the top post "Ukrainian, Russian radio enthusiasts battle
over alleged Russian military frequency — UVB-76" I went to KiwiSDR to see
if I could see any of this in action, and discovered that all the Russian
SDRs in and around Moscow are completely blacked out in the above mentioned frequencies. The waterfall is black, and theres no hash or static decoded. Russian hosted SDRs farther in the interior only block out the buzzer. SDRs
in Ukraine dont seem affected at all. This is unsettling to say the least. [Edit] Im still tinkering with it. Freqs in the title are approximate. By manually tuning Ive come up with a revised 2710-3932KHz +/- a few hundred
HZ. The other part at 2125KHz is right.
[Edit 2] Ive found one SDR in Finland thats also blocking the buzzer.
submitted by /u/playaspec
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I wrote a utility for transmitting images over the airwaves (as a
spectrogram). This is the same as what the pirates have been doing over the Russian Buzzer

Posted: 25 Jan 2022 01:34 PM PST https://www.reddit.com/r/amateurradio/comments/scoknp/i_wrote_a_utility_for_transmitting_images_over/

submitted by /u/scd31
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HF rig with small footprint that isnt qrp.

Posted: 25 Jan 2022 10:28 PM PST https://www.reddit.com/r/amateurradio/comments/sczdqp/hf_rig_with_small_footprint_that_isnt_qrp/


I’m looking for a second HF rig I can keep in my office and use with and
EFW or magnetic loop, but also maybe use it for POTA as well. Preferably something digital ready. My main rig is a DX10, which I love, but not
really that portable. Any suggestions? submitted by /u/txtreyg
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Help review my potential dual band outdoor antenna purchase!

Posted: 25 Jan 2022 06:00 PM PST https://www.reddit.com/r/amateurradio/comments/scuarc/help_review_my_potential_dual_band_outdoor/


I am working on a tight budget and need to get an outdoor antenna for my
Yaesu HT and eventually hoping to use it with a mobile radio for use as a
base station on VHF/UHF. I am looking to get a better signal into repeaters anywhere from 10-30 miles away (if possible) and potentially be able to
make some simplex contacts.
At present with my HT inside I am only able to get a modest signal into
about 2 mountaintop repeater locations and I have never been able to make a simplex contact. I also find transmitting indoors to cause other problems. Today I tried using a roll up N9TAX jpole hooked onto the porch roof and
was able to get a much better signal but I will need a slightly more sturdy antenna and some proper feedline to get me inside and away from irritating neighbors and their barking dogs.
I live in an HOA and my life is too crazy atm to approach them for
permission to get an antenna on the house. Instead, I would be looking to
place a 4-6 foot mast in the center of my backyard with the 69" tall J-Pole mounted on it and run the coax feedline to a weatherproof enclosure at the stucco wall, running it through a lightning arrestor and attaching a N to
SMA jumper (thinking that if one end of the jumper is SMA I can push it
through an existing hole in the stucco from a satellite dish line to get it into the house interior).
I am looking at getting a KB9VBR J-Pole https://www.jpole-antenna.com/shop/2-meter-break-a-way-j-pole-antenna/ The break away variety since I am interested in running portable whenever
possible and this one will fit in a car etc. I would make my own antenna
but my life is crazy right now and also I dont have funds for an antenna analyzer etc. Or something like an Ed Fong antenna.
I see that they sell the J-Pole with a SO-239 connector or a N female connector. I remember from studying for my general license that the N-type connector was water tight and could handle higher frequencies better than
the PL-259. Can I confirm this?
I was thinking about using Rg8x since I will not be burying it and will be frequently removing the antenna, cost considerations, etc. But I am having
a hard time finding 40-50 feet of RG8x with N type connectors on it at a
decent price? I am not going to be able to crimp connectors or buy that equipment right now either.
Please let me know what you think about this possible setup. I have been
trying to come up with a possible station set up for myself for some time
but it has been difficult for me to know what is practical and I havent
been able to get a solid play by play instruction of what to do from hams
on the air. Lastly, the budgetary considerations have made me hesistant to
pull the trigger on any purchases with getting some advice!
Also, will I need to have a ground rod if I am using the antenna with my battery power HT?
I dont know why I have so many questions after all my studying, thanks for reading!
Thank you for your help and 73! submitted by /u/CookElectrical8249
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End-Fed Zepp Installation Design...

Posted: 25 Jan 2022 04:44 PM PST https://www.reddit.com/r/amateurradio/comments/scsq3j/endfed_zepp_installation_design/


Looking for thoughts on how to install an End-Fed Zepp.
Here is the list of the gear I am usingI have an MFJ-1748 - https://mfjenterprises.com/products/mfj-1748The radio is an FT-857, Tuner
is either a MFJ Super Tuner II, or I also have a LDG 200 ProII
The Radio is located approx 40FT from the outside. My property is large,
but lacks trees anywhere near the house. I do have a garage that is about
35FT high located about 45FT from the house I could use, I could also put
up another tower/post if I needed to.
If I measure the distance from the house to the garage it is about 75FT
from the house to the centre/top of the garage - there is also a tall shed about 75FT -- PAST the shop as well - so some kind of dipole could go up on
the top of the garage (it is the tallest structure) and create some kind of inverted-V... Again how to feed it..

Im trying to figure out how to put up this Zepp, ideally, id like to run it full length, I also feel like im overthinking it. I want to feed the Zepp
with Coax, so I would need some kind of Balun im guessing a 4:1 or 1:1. I
have read that feeding a Zepp with Coax is a bad idea, but I dont want to
run ladder line in the house as the RF from the ladderline would cause some problems.
Im also not against doing something else other than this Zepp that Ive got. Your ideas appreciated. Feel free to tell me to toss the antenna away and
get something else, or suggest something easier. submitted by
/u/cantechit
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What is the transmitter equivalent of the RTL-SDR?

Posted: 25 Jan 2022 11:28 AM PST https://www.reddit.com/r/amateurradio/comments/sclq39/what_is_the_transmitter_equivalent_of_the_rtlsdr/


RTL-SDR with programs like SDR# has brought radio enthusiast community a magical visual experience, allowing us to make a P25 receiver for just a
little over $40, and to monitor a wide band of signals between 25MHz to
1.7+ GHz frequency range.
But this is only a receiver. Albeit a very affordable receiver at $25
So, what sort of SDR USB tech can transmit just as affordably on similarly situated open source software, if even at a relatively low power?
submitted by /u/truthfulinternet
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Starting out

Posted: 25 Jan 2022 10:42 AM PST https://www.reddit.com/r/amateurradio/comments/sckor6/starting_out/


Hello everyone, I was looking for advice on how to start out with Ham. For
a little background, Ive actually had a technician license for over a
decade (it is renewed and active). I never got into it though as I was
active duty military and then sort of forgot about it until recently. I was
a communications tech so Im reasonably comfortable with the technical
aspects of radio. Im more so looking for input on how I can be more active
in the community. Should I just pick up a repeater guide and tune in
locally to lurk? I guess my concern is that I would just be some random
dude hopping in and I dont have any direction on who I would be
communicating to. I hope this post makes sense. Any input is appreciated. submitted by /u/robbynpupperz
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Grounding an antenna

Posted: 25 Jan 2022 03:30 PM PST https://www.reddit.com/r/amateurradio/comments/scr3ex/grounding_an_antenna/


Please forgive me if this question is inappropriate for this subreddit. I
wont be offended if the mods delete it as being unrelated to ham radios,
but I was struggling to think of another group of individuals who may be
more apt to answer my question. Here goes:
Im trying to figure out the best way to ground an hdtv antenna on the roof
of my building. The building is largely made of concrete and steel,
constructed in the early 2000s. The roof is flat with no lightning rod,
however there is exposed structural steel on the roof. Its also one block
from a 14 story office building (surrounded by several other buildings
taller than mine).
Ive been wondering if the structural steel is sufficient as a ground. To
test this, I turned the breaker off for an outlet, plugged an extension
cord into it, then ran a multi-meter from the ground of the extension cord
to some exposed meal of an i-beam. The ohms registered at 1-2. Is this
enough information to make a determination?
Ive seen rooftop mounting solutions such ask (https://www.amazon.com/FRM-200-Non-Penetrating-Mount-30-Inch-2-Inch/dp/B002JM1P7O),
but finding very little on how to ground an antenna for a commercial
building. Ive tried calling an electrician or two, but they didnt seem to interested in helping.
Any help/suggestions would be appreciated, even if its "this isnt the right place, try <insert\_other\_subreddit/forum>" submitted by /u/millertime_
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Terminated End Fed Vee Antenna (TEFV)

Posted: 25 Jan 2022 10:46 PM PST https://www.reddit.com/r/amateurradio/comments/sczo1g/terminated_end_fed_vee_antenna_tefv/


Terminated End Fed Vee Antenna (TEFV) – It Is a travelling wave antenna, which has a constant current distribution along its length. Antennas
usually used by radio amateurs are resonant standing wave types like
dipoles. It is built to a specific tuned length so that a standing wave is
set up on the antenna element. This is efficient and narrow band, only
works on the fundamental frequency. In a traveling wave antenna there are
no standing waves on the antenna element as the power that would be
reflected back from the end of the antenna is absorbed by the terminating resistor. Typically this is 25% of the power applied to the antenna. The polarization of the TEFV is a mixture of vertical and horizontal that
results in a kind of elliptical polarization. The main advantages of
terminated end fed V antennas are its broadband nature and no tuner requirement. It provides a non-resonant antenna with exceptionally wide bandwidth, matching a 50 ohm coaxial cable transmission line with a VSWR of less than 2:1 from 1.8 MHz to 30 MHz.
The critical parts in TEFV antenna are 9:1 unun transformer and terminating resistor. Main problem was in constructing 9:1 Unun with correct size wire
for windings. Winding with wrong wire size resulted in poor impedance transformation and high through loss. The resistor value should be 10%
higher than the transformer output impedance. So for a 9:1 transformer (50
ohms to 450 ohms) the termination should be 500 ohms. https://vu3dxr.in/diy-terminated-end-fed-vee-antenna-tefv/ submitted by /u/OldObjective3047
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Amateur radio volunteers for the 2022 Boston Marathon needed.

Posted: 25 Jan 2022 09:15 AM PST https://www.reddit.com/r/amateurradio/comments/scio0m/amateur_radio_volunteers_for_the_2022_boston/


Heh, time flies. Seems like it was only six months ago I posted about
needing volunteers for the Marathon. (Oh wait, I did!)
Anyways, the Marathon is returning to its regular April running, so as you
can see, its already time to ask for volunteers again!
First off, let me get the elephant in the room out of the way, you must be fully vaccinated from COVID to volunteer in any role for the Marathon this year. If you need a medical exemption, requests will be reviewed
individually by the Boston Athletic Association (BAA). As for verifying
said vaccination status, that will be provided in the coming months per the BAA.
Now with that out of the way, to register: just head over to http://register.hamradioboston.org/ which is just a redirect to the BAA volunteer registration page and sign up there. If you need some guidance on
how to sign up, check out https://hamradioboston.freshdesk.com/support/solutions/articles/44002294773
for step-by-step instructions
Hope to see you there or at least hear you, Ive signed up for both Course
and Net Control this year so well see what I get.
EDIT: Forgot to add, registration closes Friday, February 18, 2022
submitted by /u/autistic_psycho
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121.5

Posted: 25 Jan 2022 09:40 PM PST https://www.reddit.com/r/amateurradio/comments/scyk9c/1215/


Is there an HT I can get that can transmit on 121.5? I’m a Student Pilot
and I’d like to keep a handset in my flight bag for”redundancy”. submitted by /u/nocturnal_tofu
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East Coast Mesh

Posted: 25 Jan 2022 12:15 PM PST https://www.reddit.com/r/amateurradio/comments/scmsh4/east_coast_mesh/


Hello! Is anyone on the East Coast US actively doing any mesh networking?
WiFi, HF, anything?
I have found several communities, but they either are in TX, WA, or
Europe...or have given less than friendly first impressions...OR are
impossible to contact because their website isnt working.
Alternatively, is anyone on the East Coast US interested in doing some mesh networking? submitted by /u/UnexampledSalt
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ARRL current promo codes

Posted: 25 Jan 2022 07:13 PM PST https://www.reddit.com/r/amateurradio/comments/scvss3/arrl_current_promo_codes/


My membership is up for renewal. I was able to get a free book at last
year’s renewal with a promo code. I haven’t found any decent codes yet for this year besides RN5 which gets you a free pin.
Anyone have any codes? submitted by /u/nielmot
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From your personal perspective, amateur radio seems to be

Posted: 25 Jan 2022 04:03 PM PST https://www.reddit.com/r/amateurradio/comments/scrtvo/from_your_personal_perspective_amateur_radio/


Active licenses and ARRL membership provide important insights into this question, but how’s it look from where you sit?
View Poll submitted by /u/caveswol
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Facade antenna

Posted: 25 Jan 2022 04:50 AM PST https://www.reddit.com/r/amateurradio/comments/scczzm/facade_antenna/


I live in a ground floor apartment and have facade covered with tiles which
are connected to long aluminum rails.
Any way I can use these rails as stealth VHF antenna? Could be rx only.
Anyone tried smth like that? submitted by /u/nathansa88
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Decoding FT8 natively on Android (no root needed)

Posted: 24 Jan 2022 10:42 PM PST https://www.reddit.com/r/amateurradio/comments/sc7dyv/decoding_ft8_natively_on_android_no_root_needed/



https://preview.redd.it/lt0s1hdd5sd81.png?width=1080&format=png&auto=webp&s=3e62385227c7d17ce78bb5ea221860e22bf1ea3a

https://preview.redd.it/b7qfhw1f5sd81.png?width=1272&format=png&auto=webp&s=23c406ee36be74e6e0f8a41dcfa33e6197f0099b
The upper screenshot shows the FT8 Decoder Android app in action on the 15m band, which is quite busy these days.
This is a paid app available at https://play.google.com/store/apps/details?id=com.bunzee.digitalradioreceiver. It can optionally report FT8 spots to https://pskreporter.info/ website.
It is possible to decode FT8 traffic from more than a 100 countries in a
single day with a modest dipole wire antenna. submitted by /u/walleij
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Anyone ever try one of these?

Posted: 25 Jan 2022 09:56 AM PST https://www.reddit.com/r/amateurradio/comments/scjmrn/anyone_ever_try_one_of_these/

submitted by /u/voiceofreason4166
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Online electronics course recommendations?

Posted: 24 Jan 2022 11:55 PM PST https://www.reddit.com/r/amateurradio/comments/sc8h6h/online_electronics_course_recommendations/


Is there a good online basic electronics course? Something self-paced, with videos and a building block approach…. I have tried a few Dave Casler
videos, but his videos seem to assume a basic knowledge I don’t yet have. I’ve explored Khan Academy, and there is some really helpful content, but
the volume of videos is a bit overwhelming and I don’t know what order I should try to watch them in.
I bought and started reading the ARRL Handbook, and I tried working through
a US Navy electronics self-study guide. I bogged down in both of these
books.
I’m really interested in how things work, particularly radio, but I’m struggling. I don’t find any of this intuitive. submitted by
/u/kilo_fife
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