The Chinese Pixie transceiver operating at 7023 kHz has become very popular. It often costs less than 5 USD on Ebay. Like most Pixies it is susceptible to broadcast breakthrough and intermodulation. Much of this is caused by the keying circuit of the audio amplifier, the LM386. The cure is to move the muting diode from the power supply pin (no. 6) to the bypass pin (no. 7). I have described this in another blog post with title: “Using pin 7 of the LM386 to reduce BCI and add side tone to Pixie 2“.

Here are two pictures that show how this can be done for the Chinese Pixie. One needs an additional resistor in the range 10 – 47 ohms. I have used 10 ohms in the picture. It replaces the old R3 of 1 k. The diode D3 is not mounted, and instead it is mounted under the PCB with the minus (denoted by the ring) connected to where D3’s minus was, and the plus side connected to pin 7 of the LM386.

R3 is indicated by the lower left arrow, and the old placement of D3 is shown with the upper arrow

Arrow showing where D3 instead should be soldered. The minus, indicated by the ring, is to the left in the image

Sverre Holm, LA3ZA, is a regular contributor to AmateurRadio.com and writes from Norway. Contact him at [email protected].

Amateur Radio Weekly is curated by Cale Mooth K4HCK. Sign up free to receive ham radio's most relevant news, projects, technology and events by e-mail each week at http://www.hamweekly.com.

Do you want to get back to the original roots of Amateur Radio? Maybe you are a new ham and you have a DIY side? Maybe you just want to try something new? There are so many things that you can do with an Arduino that cost only $4 or so! Anything from a morse code keyer to a 40m QRP CW Radio and a whole lot in between. You can even do things with an Arduino that has nothing to do with amateur radio but you will find a use for.

In this episode with talk with Glen Popiel, KW5GP the author of the ARRL published books, Arduino for Ham Radio and his new book that just came out, More Arduino for Ham Radio. He is also the author of the ham mesh networking book, High Speed Multimedia for Amateur Radio.

We had a great conversation and it made me literally go to the ARRL website and buy his new Arduino book while we were recording! Check out the show notes of this episode to listen and to get more information about what we talked about. There are also links to his books that you can go to to buy one for yourself.

Check out the show notes!

Curtis Mohr, K5CLM, is the author/owner of Everything Ham Radio Blog and Youtube channel. Contact him at [email protected].

Late May's EME activity seemed poorer and less active than the previous month of northern declination moonrises.

Unlike winter's northern moonrises, the summer ones occur close to 'new moon' time and for a few days on the much favored northern path, the moon is too close to the sun, resulting in lower activity and higher noise. As well, with the warmer summer weather, outdoor projects or other summer activities often take priority over ham radio operations at this time of the year.

Nevertheless, I did manage to work five stations with my small station, and added four 'new initials', bringing my total unique-station QSO total to 105 ... it seems there are still plenty of folks out there that I have yet to work!

• VE1KG

• OK1DIX #102

• S53K #103

• IK1UWL #104

• OZ1CT #105

IK1UWL's 4 x 9el cross-polarized array

S53K's 4 x 11el array

OZ1CT's 4 x 10el cross-polarized array

Latest Incoming EME QSLs:


With the summer Sporadic-E season now in full swing, I've had the opportunity to make some early observations regarding the growing use of the weak-signal digital modes. It seems my previous suspicions about the migration from traditional modes to the digital modes is occurring even more rapidly and in much larger numbers than I had expected. Almost all early activity has been concentrated on both JT65 and JT9 modes and most of the chatter on the ON4KST 6m chat page centers around these digital modes.

So far this season I have heard much more DX on JT65 than on CW or SSB, including two stations in Europe on Tuesday (EI4DQ and F5LNU). It seems that many QSO's are taking place with signals that are usually too weak to be heard by ear (~ -16db or weaker) and if listening for CW signals, the band would appear to be pretty much dead. With no full-blown openings to Europe yet, I just wonder if stations will stay put on JT65 or move to the much faster CW mode for making quick contacts when the propagation allows?

Making JT65 contacts is not a particularly fast process, with most QSOs taking a minimum of four minutes, if both operators are well acquainted with the procedures ... longer if not or if QRM or propagation throws a spanner into the works. Some of the newer JT9 sub modes allow for quicker exchanges as does the much less sensitive MSK144 mode but with so many options now available, it's often difficult to get everyone on the same mode or at least figure out what mode you are seeing!

I can see the advantages of using these modes when conditions will not support CW but will still allow digital decodes. If the normal 'weak signal window' can be sustained for a much longer time period than the usually short-lived audible CW-level window, perhaps more stations could actually be worked on these modes even though the QSO rate is much slower. But I still think that many easy CW QSO's will inevitably be missed when operators are watching their digital waterfalls and ignoring the CW end of the band ... of course, if everyone is doing that, then there will be nothing to be heard on CW, even though conditions may well support good signals.

It's a strange new situation and I'm probably not the only one that may be worried about the negative effects of the new weak-signal modes on 6m ... time will tell, but for me, if things keep going along this path, much of 6m's magic may be gone along with it.

Some other initial observations are:

- maybe it's possible to work more DX on weak signal mode, even though it is slower, because of the possibly longer propagation window at sub audible signal levels? ... ie. on a seemingly 'dead band' by ear.

- many are using the wrong sequence when calling for EU or JA. Folks need to pay attention to what sequence the DX is using!

- if your neighbours are running on even or odd sequence, then it might be neighbourly to also use the same sequence to avoid causing disruptive QRM. This seems to go south fast, once the band breaks wide open and it seems like 'every man for himself' ... not unlike 50.125!

- there are too many weak-signal modes and it would be advantageous to settle on a 'standard' mode for 6m DX. It seems as though many are wasting valuable time either switching modes or trying to figure out what mode they are seeing but not decoding! On long haul 6m Es, things change too quickly to waste time.

- there are still a lot of over-driven signals or signals with 60Hz components causing double decodes +/- 60Hz from their main signals.


Steve McDonald, VE7SL, is a regular contributor to AmateurRadio.com and writes from British Columbia, Canada. Contact him at [email protected].

Late May's EME activity seemed poorer and less active than the previous month of northern declination moonrises.

Unlike winter's northern moonrises, the summer ones occur close to 'new moon' time and for a few days on the much favored northern path, the moon is too close to the sun, resulting in lower activity and higher noise. As well, with the warmer summer weather, outdoor projects or other summer activities often take priority over ham radio operations at this time of the year.

Nevertheless, I did manage to work five stations with my small station, and added four 'new initials', bringing my total unique-station QSO total to 105 ... it seems there are still plenty of folks out there that I have yet to work!

• VE1KG

• OK1DIX #102

• S53K #103

• IK1UWL #104

• OZ1CT #105

IK1UWL's 4 x 9el cross-polarized array

S53K's 4 x 11el array

OZ1CT's 4 x 10el cross-polarized array

Latest Incoming EME QSLs:


With the summer Sporadic-E season now in full swing, I've had the opportunity to make some early observations regarding the growing use of the weak-signal digital modes. It seems my previous suspicions about the migration from traditional modes to the digital modes is occurring even more rapidly and in much larger numbers than I had expected. Almost all early activity has been concentrated on both JT65 and JT9 modes and most of the chatter on the ON4KST 6m chat page centers around these digital modes.

So far this season I have heard much more DX on JT65 than on CW or SSB, including two stations in Europe on Tuesday (EI4DQ and F5LNU). It seems that many QSO's are taking place with signals that are usually too weak to be heard by ear (~ -16db or weaker) and if listening for CW signals, the band would appear to be pretty much dead. With no full-blown openings to Europe yet, I just wonder if stations will stay put on JT65 or move to the much faster CW mode for making quick contacts when the propagation allows?

Making JT65 contacts is not a particularly fast process, with most QSOs taking a minimum of four minutes, if both operators are well acquainted with the procedures ... longer if not or if QRM or propagation throws a spanner into the works. Some of the newer JT9 sub modes allow for quicker exchanges as does the much less sensitive MSK144 mode but with so many options now available, it's often difficult to get everyone on the same mode or at least figure out what mode you are seeing!

I can see the advantages of using these modes when conditions will not support CW but will still allow digital decodes. If the normal 'weak signal window' can be sustained for a much longer time period than the usually short-lived audible CW-level window, perhaps more stations could actually be worked on these modes even though the QSO rate is much slower. But I still think that many easy CW QSO's will inevitably be missed when operators are watching their digital waterfalls and ignoring the CW end of the band ... of course, if everyone is doing that, then there will be nothing to be heard on CW, even though conditions may well support good signals.

It's a strange new situation and I'm probably not the only one that may be worried about the negative effects of the new weak-signal modes on 6m ... time will tell, but for me, if things keep going along this path, much of 6m's magic may be gone along with it.

Some other initial observations are:

- maybe it's possible to work more DX on weak signal mode, even though it is slower, because of the possibly longer propagation window at sub audible signal levels? ... ie. on a seemingly 'dead band' by ear.

- many are using the wrong sequence when calling for EU or JA. Folks need to pay attention to what sequence the DX is using!

- if your neighbours are running on even or odd sequence, then it might be neighbourly to also use the same sequence to avoid causing disruptive QRM. This seems to go south fast, once the band breaks wide open and it seems like 'every man for himself' ... not unlike 50.125!

- there are too many weak-signal modes and it would be advantageous to settle on a 'standard' mode for 6m DX. It seems as though many are wasting valuable time either switching modes or trying to figure out what mode they are seeing but not decoding! On long haul 6m Es, things change too quickly to waste time.

- there are still a lot of over-driven signals or signals with 60Hz components causing double decodes +/- 60Hz from their main signals.


Steve McDonald, VE7SL, is a regular contributor to AmateurRadio.com and writes from British Columbia, Canada. Contact him at [email protected].

NooElec and AmateurRadio.com have teamed up
to give away
Software-Defined Radio (SDR) Receiver Packages
to 30 lucky ham radio operators worldwide!

…plus NooElec will even pay the shipping worldwide!
The deadline to enter is 14 June 2017 at 18:00 UTC.

Prize Packages

Two (2)
NESDR SMArt XTR HF Bundles
(with TCXO upgrade module)
 Listen to and watch frequencies from
100kHz – 2300MHz+ with this bundle.

Five (5)
NESDR Nano 2+ ADS-B Bundles
Includes 2 calibrated and programmed SDRs,
4 antennas, and 5 RF adapters per prize.

Five (5)
NESDR Nano 2 ADS-B Bundles
Includes 2 calibrated and programmed SDRs,
4 antennas, and 5 RF adapters per prize.

Five (5)
NESDR SMArt and NESDR SMArt XTR Two-Packs
One of each per prize.

Three (3)
NESDR SMArt XTR bundles with antennas

Ten (10)
NESDR SMArt XTR SDRs

Eligibility

All licensed ham radio operators worldwide!
(Free worldwide shipping is included!)

How to Enter

It’s very simple!
Leave a comment to this post.
(e-mail address will not be shared)

Entry Duration

Only 1 week!

You may enter only once from
7 June 2017 18:00 UTC
to
14 June 2017 18:00 UTC

(multiple entries from the same entrant will be discarded)

Winner Announcement

15 June 2017

You can get the winner announcement by
subscribing to our free Amateur Radio Newsletter (subscribe below),
following our posts via RSS feed, via Twitter (@amatradio),
or via Facebook (facebook.com/amatradio).

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Sign up so you won’t miss our next prize drawing!

Please tell your friends about this giveaway!

Thank you to NooElec for offering these fantastic prizes!

Visit their website at NooElec.com / eBay store / Amazon store

Interested in ordering now on their website? Use coupon code
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for $10 off orders of $100+
(valid through June 17, 2017 at NooElec.com)

The winner will be chosen at random (using random.org) from all valid comment entries to this post received by the contest deadline. Entries will be deemed valid at the sole discretion of AmateurRadio.com and may be rejected for any reason, including inappropriate comments. Entries received after the deadline will not be considered. The prize may not be transferred. The prize may not be exchanged for cash. Winner agrees to allow AmateurRadio.com to use their name and callsign to announce them as a winner on our site, and to share their contact information with the sponsor for the purposes of awarding the prize. No purchase necessary to win. Odds of winning dependent on total number of entries received. Winner is responsible for any applicable taxes or fees imposed by their jurisdiction. Void where prohibited by law. Winners limited to licensed Amateur Radio Operators and subject to export restrictions, where applicable.  E-mail addresses of all other entrants will not be shared with any third party, including the sponsor. Entrants will not receive any unsolicited e-mail or be placed on any e-mail list.

Don’t forget to enter! Just leave a comment to this post.

Matt Thomas, W1MST, is the managing editor of AmateurRadio.com. Contact him at [email protected].

When broadcast television began to get big, back in the ’50s, the pundits predicted that it would kill radio. It didn’t, of course, because radio changed to serve its market in different ways (music, news and talk replaced soaps and serials). But TV did quickly become the 8000 pound gorilla … despite a recent radio industry group’s campaign saying that people spend more time with radio than TV today.

Television (or video) has existed in ham radio for a few decades. But for us, it’s still a very niche mode, practiced by a relative handful of hams. Despite all my television/video experience and all the video equipment I’ve accumulated for HamRadioNow.tv, I’ve never had much interest in ATV. Some local guys have had an ATV repeater on and off for a while, but I didn’t catch their bug. Of course, I spend very little time at home on the air. 90% of my operating time is mobile. But lots of hams do spend time on the air from the shacks, on radio.

So why hasn’t video been embraced by the masses?

Equipment is probably one reason. Until recently, hams have used mostly the same analog AM video mode as broadcast television did BD (Before Digital in 2009). A little off-the-shelf equipment has been available. Not that expensive, but not an impulse-buy, either. Getting it on the air was a little challenging. Broadcast TV runs hundreds of kilowatts with antennas on 1000’+ towers. Hams discover that when you spread ham-style signals out from a couple of kHz of SSB or FM to cover 6 MHz (the bandwidth of an AM TV signal), those signals sputter out pretty fast (but, as my guest on this show will point out, not that fast!). Repeaters help, but there are only a few repeaters around. And there’s certainly no large group of hams on the air to help pull you in. You have to decide that this is an edge you want to sit on.

Digital to the rescue? Broadcast TV was required to switch from analog to digital over a decade ago. Ham TV wasn’t required to, but some hams discovered and repurposed some relatively inexpensive digital equipment and discovered that digital ATV was better than analog in many ways (better picture, lower bandwidth, high definition, and at least not more expensive… maybe cheaper). They mostly don’t use the same digital that broadcast TV does in the USA. The digital equipment available allows for a variety of modes and schemes, adapted from cable-TV, satellite broadcast, microwave link and European broadcast digital TV.  And, btw, in a year or two the USA will change to a totally different digital video system, but that’s another story.

The digital stuff has made ATV repeaters easier, and  it’s made operating way more flexible. Analog ATV worked pretty much with a camera pointed at the ham’s face. You could maybe play back a VHS tape into your transmitter, but switching and mixing video required some expensive equipment. The repeaters could repeat the input signal, and that’s all. Well, the the same digital revolution that makes HamRadioNow possible on a shoestring budget (while looking better than broadcast TV did 20 years ago) lets ATV operators become studios. And video over the Internet does the same thing for ATV that it does for D-STAR, DMR, Fusion, etc. on voice: it brings activity from around the world to the local repeater when otherwise the handful of local ops wouldn’t really sustain it.

HamRadioNow has covered many TAPR DCC talks on digital ATV over the past decade. Yes, the first were this talk by Ken Konechy W6HHC (very technical) and this talk by Art Towslee WA8RMC (more operational) back in 2009. Seems like ancient history, but Art says they’d had digital on their ATV repeater in Columbus OH for 5 years . For more, dig out this YouTube Playlist and scroll to Episodes 127, 168, 169, 227, 284!

This year, we talked to digital guru Mel Whitten K0PFX and ATV Quarterly magazine editor Mike Collins WA6SVT in our thunderstorm prone SIB* tucked back in Tent City at the 2017 Dayton Hamvention®. The conversation is mostly aimed at hams who have never (and may never) operated ATV, but wouldn’t mind being informed about the subject. That’s plus or minus (OK, all plus) some ATV jargon that’s hard to avoid when talking to geeks.

Will this ‘new’ digital ATV finally create a mass migration to video? OK, I don’t think so. Maybe for the same reason we still make phone calls instead of ‘video calls’ on Skype, Duo, Facebook and Facetime (etc. etc.). We don’t want to have to look pretty for the camera. Hey, don’t call me on video right now! I’m still in my sweats and I haven’t showered yet. I’m not ready for my close-up, Mr. DeMille.

*Studio In a Booth

Gary Pearce, KN4AQ, is the host of HamRadioNow.tv. If you enjoy this and other HamRadioNow programs, help keep them 'on the air' with a contribution. Contact him at [email protected].