Shortwave Radio (Evaton RF Nomad?)

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rh2y
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Post by rh2y » Mon Jan 02, 2017 9:12 am

stevebryson wrote:Can the wire for an extended antenna be stranded, or does it need to be single-core? All the wire I have laying around is stranded copper.
The production antennas are stranded wire. So, yes, that will work just fine!

Evaton sells 25' extended antennas as a convenience, but you can make your own any-length antenna by soldering a length of wire to the center pin of an RCA plug.

Or, just strip the end of the antenna that came with the Nomad, and solder on an extension.

Russ

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Post by brianobush » Mon Jan 02, 2017 3:19 pm

stevebryson wrote:Can the wire for an extended antenna be stranded, or does it need to be single-core? All the wire I have laying around is stranded copper.


The type of wire should not matter, only thing that matters if it conducts or not.

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Post by stevebryson » Tue Jan 03, 2017 4:59 am

Thanks, rh2y and brinaobush! I'll go make the long antenna.

Next question: does it need to be strung in a straight line, or can I have it in an L or U shape? My very poor understanding of antennas says straight line. But I don't have 25' of straight line in the house. Not where my wife would allow it, anyway.
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rh2y
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Post by rh2y » Sun Jan 29, 2017 2:37 pm

stevebryson wrote:Thanks, rh2y and brinaobush! I'll go make the long antenna.

Next question: does it need to be strung in a straight line, or can I have it in an L or U shape? My very poor understanding of antennas says straight line. But I don't have 25' of straight line in the house. Not where my wife would allow it, anyway.
You kinda have to experiment to see what works best in your particular environment.

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Chartreuse-J
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Post by Chartreuse-J » Sun Jan 29, 2017 10:10 pm

Been looking at longline shortwave antennas on Amazon, anyone used something similar with the RF Nomad?


Long Line Shortwave Antenna

http://a.co/cCzoCpU

Coax to RCA Adapter

http://a.co/hU8U4fw

50 Ohm Coax Cable 20 foot

http://a.co/08txj8i
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mutierend
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Post by mutierend » Fri Mar 31, 2017 8:09 pm

Chartreuse-J wrote:Been looking at longline shortwave antennas on Amazon, anyone used something similar with the RF Nomad?


Long Line Shortwave Antenna

http://a.co/cCzoCpU

Coax to RCA Adapter

http://a.co/hU8U4fw

50 Ohm Coax Cable 20 foot

http://a.co/08txj8i
Any luck with this?

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InsectInPixel
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Post by InsectInPixel » Sat Apr 01, 2017 2:16 pm

ztron wrote:HI I know that you were looking for a shortwave module but I use this website http://websdr.ewi.utwente.nl:8901/ Its a live controllable shortwave receiver you can save recordings on that site as well .
http://priyom.org/ have a number stations schedule so you can see when the next broadcast is about to begin There are lots of number broadcasts throughout the day.
Again maybe not what your looking for but worth a try
Thanks for sharing this @ztron. I woke up around midnight for a muchie and read this. 3 1/2 hours went by of me reliving my childhood in the 80's,scanning through the bands on a shortwave radio, exploring the world! :hihi:
I make UnderBridge for the Elektron Analog Keys. https://youtu.be/dowAKQkFAE0

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Chartreuse-J
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Post by Chartreuse-J » Sat Apr 01, 2017 7:44 pm

mutierend wrote:
Chartreuse-J wrote:Been looking at longline shortwave antennas on Amazon, anyone used something similar with the RF Nomad?


Long Line Shortwave Antenna

http://a.co/cCzoCpU

Coax to RCA Adapter

http://a.co/hU8U4fw

50 Ohm Coax Cable 20 foot

http://a.co/08txj8i
Any luck with this?
No luck as of yet I don't even have this stuff yet. Wanted to confirm with other wigglers or rh2y if there will be a noticeable improvement in reception.

Also, was also looking at this 10 turn pot made by Sakae Tsushin Kogyo Co in Japan as an alternative to the existing tuner pot in there. Supposedly the smallest 10 turn in the world, thought it would be cool to use as a direct replacement.

http://sakae-tsushin.co.jp/eng_page/item/m_turn.html

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Post by duck1887 » Tue Apr 25, 2017 8:36 am

InsectInPixel wrote:
ztron wrote:HI I know that you were looking for a shortwave module but I use this website http://websdr.ewi.utwente.nl:8901/ Its a live controllable shortwave receiver you can save recordings on that site as well .
http://priyom.org/ have a number stations schedule so you can see when the next broadcast is about to begin There are lots of number broadcasts throughout the day.
Again maybe not what your looking for but worth a try
Thanks for sharing this @ztron. I woke up around midnight for a muchie and read this. 3 1/2 hours went by of me reliving my childhood in the 80's,scanning through the bands on a shortwave radio, exploring the world! :hihi:
One more satisfied "customer" here. I could listen to this stuff all day. The trick is to find a station and then move off just a bit so it isn't coming in very well. Then you get all kinds of crunchy rhythmic noise and that lovely ring-mod sound. I already have a couple of hours of this recorded via AudioHijack (although the site allows recording all by itself). Thanks ztron!!

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Koryo
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Post by Koryo » Fri Apr 28, 2017 10:07 pm

Bought a used RF Nomad (Thanks "SPIKE the Percussionist" ((He even included HIS sticker!))) in the original box with the factory long antenna. Was super excited to have strange random "spacey" noises and had always wanted to hear voices from around the world. However, I had read the posts here and I sorta knew what I was getting into.

Strung up the antenna, plugged it in, fired it up and promptly heard static with a heterodyne squeal. Ok, I thought this is not sooo bad. Played with it for awhile turned it off and had some dinner. After dinner I came back to nothing but static. Miles and miles of static. Only static. I thought I had broke it. Futzed around with the antenna and got super bummed. All the negative posts sank in.

The next day I read up more intently on the problems users were having. Read over the mods and alternate tunings that can be applied. I was not having any of it because of the detailed responses of "rh2y". He made really good choices in the design of this thing and has perfect reasoning why he factory tuned it as he did.

In the words of Young Ellie "I'm going to need a bigger antenna."

So I had a blast diving into the ham world, but man, those guys are weird. Anyhoo, because I had space, and the bandwidth of the Nomad, I decided to do a 9.6MHz ~(30m) 1/2 wave dipole antenna (~50 ft span) outside, on a large wooden fence. I went and bought 14 gauge stranded copper wire, a twin terminal to BNC adapter, a BNC to RCA adapter, and 100 feet of 50 ohm coaxial cable. That, my friends, made all the difference in the world. Talk about touchy. Lots of stations that you pass through with the slightest glance of the knob. The static sounds different, it's super loud (meaning the RF gain and Audio level knobs make sense now.) and it works on into the night like I was wanting. There are now frequencies that have strange sounds if you can manage to tune on top of them. It's a whole new world out there.

TL;DR
So I can totally see why some would not have any fun with the RF Nomad. If you can't do a good antenna I would not recommend a Nomad. ...but if you can, it's awesome! A good multi band filter would be a wise addition to the mix as well.


I'm going to make a magnetic loop antenna next, just because it's fun, and I hope I find a numbers station at some point. Oooh, some British guy and gal are speaking. Sounds like Orb! Love it!

K-O-R-Y-O signing off.

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Post by duck1887 » Sat Apr 29, 2017 9:32 am

Thanks koryo, that's really helpful. I hadn't been getting much out of my Nomad, but I have held onto it because I live in a valley and might do better when I move out of it someday. But maybe I will try your suggestion for a better antenna. In any case I definitely second your point that there is a whole world of crazy awesome sounds out there! :sb:

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brandonlogic
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Post by brandonlogic » Tue Oct 10, 2017 4:15 pm

a new track featuring my DIY rf nomad!
love this thing as a noise source. modulated by lfos from benjolin.
https://soundcloud.com/brandon-logic/mo ... wave-radio

[soundcloud url="https://api.soundcloud.com/tracks/346305298" params="color=ff5500&auto_play=false&hide_related=false&show_comments=true&show_user=true&show_reposts=false" width="100%" height="166" iframe="true" /]
Last edited by brandonlogic on Tue Oct 10, 2017 4:45 pm, edited 1 time in total.

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softroom
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Post by softroom » Tue Oct 10, 2017 4:42 pm

I guess this explains why I haven't had a single radio station out of mine then. Time to get hammy... (or flog the darn thing)

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brandonlogic
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Post by brandonlogic » Tue Oct 10, 2017 4:47 pm

softroom wrote:I guess this explains why I haven't had a single radio station out of mine then. Time to get hammy... (or flog the darn thing)
i think its great and worth keeping even if you get no stations, just as an interesting noise source. beats your everyday white/pink noise source. but i have been able to pick up some foreign radio and what sounds like Morse code just using a long wire and throwing it out the window of my 2nd floor studio...

totally dependent on the time of day and weather of course

guestt

Post by guestt » Tue Oct 10, 2017 5:42 pm

Hey Koryo

Great post :D

I would highly recommend using the double attenuator trick to help fine tune those stations in, it really makes everything a lot easier!

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Post by EPTC » Wed Nov 28, 2018 7:36 pm

I love the RF Nomad. Wrote about it this week in The Bureau series.

Many sound file examples here: https://boingboing.net/2018/11/28/the-b ... the-p.html

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theauton
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Re: Shortwave Radio (Evaton RF Nomad?)

Post by theauton » Fri Jun 12, 2020 11:26 am

Having great fun with my RF Nomad, built from the kit.
It takes me back to my childhood, when I was fascinated by the sounds produced on the SW band of my radio.
Where I live in the UK the reception isn't fantastic, so I'm glad I opted for the 25 foot antenna.
Managed to squeeze in a 10 turn pot for tuning, which
was 20mm in diam & thus necessitated a bit of filing to fit it into the gap between the other pots (& relocation of the 10uF cap that was in the way).
The 10 turn pot certainly makes fine tuning more straightforward and seems to have improved the number of stations I'm picking up.

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Re: Shortwave Radio (Evaton RF Nomad?)

Post by JonoVizion » Fri Jun 12, 2020 1:40 pm

theauton wrote:
Fri Jun 12, 2020 11:26 am
Having great fun with my RF Nomad, built from kit.
That’s awesome! I’m very curious about the module. What’s the coolest thing you’ve picked up, from how far away do you figure?

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EdBrock
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Re: Shortwave Radio (Evaton RF Nomad?)

Post by EdBrock » Fri Jun 12, 2020 3:00 pm

Have not seen much music with SW and synths. Really like the track in this thread by David Fyans, Between the Fires. Nice job.

A track I recently did is attached with soft synth, percussion and SW.
Attachments
Bazrangid.mp3
(9.06 MiB) Downloaded 2 times
I thought I would build a few modules to see if I liked it and guess what happened......

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theauton
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Re: Shortwave Radio (Evaton RF Nomad?)

Post by theauton » Wed Jun 17, 2020 2:08 pm

JonoVizion wrote:
Fri Jun 12, 2020 1:40 pm
theauton wrote:
Fri Jun 12, 2020 11:26 am
Having great fun with my RF Nomad, built from kit.
That’s awesome! I’m very curious about the module. What’s the coolest thing you’ve picked up, from how far away do you figure?
It's hard to say as most stations are quite garbled, meaning that speech unintelligible, but sounds really cool though!
I've picked up what sounds like French, Russian, Chinese & Indian stations. What you pick up is mostly down to luck, time of day, the weather & patience but that's the beauty of this module I guess!

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klacke
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Re: Shortwave Radio (Evaton RF Nomad?)

Post by klacke » Thu Jun 18, 2020 2:59 am

I have no knowledge about antennas and I am having problem with getting good reception. I have tried using Evaton 25' extended antennas but that did not help. Now I found this 418MHz MHW Dipole-antenna https://www.mouser.se/datasheet/2/238/a ... 659371.pdf.
Would that antenna help RFNomad to get better reception?

Should you use RPSMA or SMA antennas with RFNomad?

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Re: Shortwave Radio (Evaton RF Nomad?)

Post by kpreid » Thu Jun 18, 2020 11:30 am

klacke wrote:
Thu Jun 18, 2020 2:59 am
I have no knowledge about antennas and I am having problem with getting good reception. I have tried using Evaton 25' extended antennas but that did not help. Now I found this 418MHz MHW Dipole-antenna https://www.mouser.se/datasheet/2/238/a ... 659371.pdf.
Would that antenna help RFNomad to get better reception?
No. An antenna designed for 418 MHz will do almost nothing for 10 MHz reception; you need to look at antennas designed for 10 MHz.They will be much larger (likely 25' or 50').

How did you spread out the 25' antenna? Was it suspended in the air? Away from the ground, and away from anything grounded (if your rack is) is important.
klacke wrote:
Thu Jun 18, 2020 2:59 am
Should you use RPSMA or SMA antennas with RFNomad?
Connector type does not change how an antenna works and you can use adapters as needed. The connector on the RF Nomad is a RCA connector, which is not commonly used as an antenna connector but you can most commonly find adapters for RCA to BNC and then from BNC to anything else. (Note that instead of stacking up rigid adapters you may want to get a short "pigtail" adapter cable.)

That said, I would recommend avoiding RP-SMA. It is a deliberately unusual connector type most common on items like WiFi antennas which are, again, totally unsuitable in frequency range. So, any antenna you buy that already has RP-SMA will not be particularly helpful.

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klacke
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Re: Shortwave Radio (Evaton RF Nomad?)

Post by klacke » Mon Jun 22, 2020 3:06 am

kpreid, thank you for all info. Now I know more what to try
:-)

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Re:

Post by EATyourGUITAR » Tue Jul 28, 2020 10:58 pm

Chartreuse-J wrote:
Sat Apr 01, 2017 7:44 pm
Image
I did some research. the antenna and that small 10 turn pot together would cost me almost as much as the RF nomad. I have to think long and hard about if I am going to keep spending money on it. I admit I want to like it. but my LFO is modulating the tune through the power supply or something. I'm not sure if maybe the nomad is unstable or maybe the potentiometer is unstable? I get this slow fade in fade out. the frequency is like 0.33Hz. could be the radar tower down the road. is that even possible?
WWW.EATYOURGUITAR.COM <---- MY DIY STUFF

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Re: Shortwave Radio (Evaton RF Nomad?)

Post by 1960strat » Wed Jul 29, 2020 10:42 am

The SDR options raised above can be really hit or miss but can be awesome. Most recently, I am using with a Berfaco Percall and cutting up the noise with triggers

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