Testing the MFJ-1020C Active Antenna/Preselector

By Jock Elliott, KB2GOM

Truth be told, I’ve been curious about the MFJ 1020C for a long time. Back when I wrote for Passport to World Band Radio, over a decade ago, I wondered if the 1020C was a worthwhile device, but then I had a big wire antenna outside connected to a communications receiver, so I didn’t worry so much about squeezing every last erg out of the signals I was receiving. As a result, I never experimented with an MFJ 1020C.

Now, however, I have a 50-foot indoor end-fed wire antenna connected to a Grundig Satellit 800, and I am constantly looking to improve the signal. Feeding the signal through a 9:1 unun and then through coax to the Satellit 800 has boosted the signal-to-noise ratio a bit — https://swling.com/blog/2022/05/the-satellit-800-the-tecsun-pl-880-and-two-indoor-antennas-an-afternoon-of-experimentation/ — and so has grounding the unun — https://swling.com/blog/2022/05/jock-gets-a-good-grounding/. But is there such a thing as too much signal to noise? Not in my not-so-humble opinion, so the quest for improvement continues.

During a phone call with Thomas (Maximum Leader of SWLing.com), I mentioned my curiosity about the 1020C. Thomas said, “MFJ is a sponsor of SWLing.com, I’ll see if they would like to send you one for testing.” Two days later, a package arrived with the 1020C, a power supply for it, and a short coax jumper.

The Basic Layout

The 1020C is small — 2.5” H x 6.4” W x 3.3” D – and looks well made. It covers 300 KHz to 40 MHz. On the front panel are two knobs, a push button, and a selector switch. The left-most knob controls the gain of the amplifier. Moving to the right, you’ll find a push button that controls the bypass circuit.

To the right of the bypass button, you’ll find the band switch, which controls which frequency range is in use, and to the right of that is the tuning knob which allows you to peak the signal in the frequency range you have selected. We’ll get to how it all works in just a bit.

On the back of the 1020C, you’ll find a coax connector labeled INPUT and another labeled OUTPUT, a grounding post, and a connector for the external power supply.

Setup is easy. Plug the power supply into the wall and into the back of the 1020C. (You can also run the 1020C off a 9-volt battery, which we will discuss in a while.) Connect a coax jumper from the OUTPUT connector on the 1020C to the coax input on your receiver. (If you don’t have a coax connector on your receiver, we’ll deal with that issue shortly).

Finally, you need to make a choice about which antenna you want to use. The 1020C Owner’s Manual says:

You may connect either the telescoping antenna provided or an external wire antenna of your choice. To connect the telescoping antenna; screw the antenna end through the top cover and into the spacer located on the PC board. If you chose to use external wire antenna; plug it into the INPUT SO239 connector located on the back of the unit. (DO NOT HAVE BOTH ANTENNAS CONNECTED AT THE SAME TIME!)

Attaching the telescoping antenna can take a while since you may have to hunt around to get the antenna centered on top of the screw inside the 1020C’s case.

Operating the MFJ 1020C

Here’s how I operate the 1020C:

With the BYPASS turned ON (the button pressed in), tune the receiver to the frequency you want to hear.
Set the GAIN knob to around 3 or 4.
Set the BAND knob to the band with the MHz that you are tuned to. You will notice that the red PWR indicator on the 1020C lights up.
Press and release the BYPASS button. This turns on the active preselector and amplification circuits.
Slowly turn the TUNE knob back & forth. At some point in its tuning range, you will hear the signal peak. With the 1020C, I often find there is a spot where the noise peaks and a hair to the side of the noise peak is the sweet spot for listening.
Finally, adjust the GAIN knob for maximum intelligibility of the signal.

Note: When the BYPASS button is pushed IN (the ON position), that means you are hearing the signal straight through from the antenna without going through the amplification and preselection circuits of the 1020C . . . it’s like the 1020C isn’t even there. This is true even if the red PWR LED is illuminated. To put the 1020C to work for you, the BYPASS button must be OUT, and a band must be selected.

The Results of My Tests

Bottom line: the 1020C can really help in certain situations.

Initially, I set up the 1020C with its diminutive 20 inch antenna and connected a coax jumper cable between its coax output and the coax input on the back of the Satellit 800. I wanted to see if it would out-perform the four-foot-long telescopic antenna on the Satellit. No way, I thought; the Satellit antenna is twice as long. But I was wrong. On the first day I tested the 1020C, the atmospheric noise was terrible. I could not hear time station CHU on 3.330 MHz at all with the Satellit’s built-in antenna. But with the 1020C properly tuned, I could hear the time “pips” on CHU clearly.

A couple of days later, when SWLing.com announced the Annual Armed Forces Day Crossband Test — https://swling.com/blog/2022/05/today-14-may-2022-annual-armed-forces-day-crossband-test/ — I set out to see if I could hear some of the stations. I removed the telescopic antenna from the 1020C and connected the 1020C to my indoor end-fed antenna. Putting the unit in bypass mode, I then started punching in the crossband test frequencies on the Satellit 800. At each frequency, I would first listen to the frequency in “barefoot” mode, then activate the 1020C to see if I could bring any intelligible signal up out of the noise. I had no success until I got to 14.487 MHz USB. With the straight-through indoor end-fed antenna, I heard nothing, but with the 1020C engaged and carefully tuned, I could copy a station sending in CW: CQ CQ CQ. Later I was able to confirm the ID as NSS from Annapolis, Maryland, one of the stations in the crossband test.

On some easier-to-hear signals, the 1020C sounds as if it lowers the noise floor, improving the “listenability,” but the 1020C does not improve all signals. Sometimes the signal processed by the 1020C sounds roughly the same as the bypassed signal. And sometimes the bypassed signal (straight through from the antenna without the 1020C in-line) simply sounds better.

The pigtail.

Testing the 1020C with a Portable

Next, I tried the 1020C with my Tecsun PL-880. Immediately, I was confronted with a problem: how to get the signal from the coax output of the 1020C and into the antenna socket of the 880. Fortunately, a ham friend fabricated a “pigtail” for me that made the connection from the coax connector on the 1020C to the antenna input socket on the PL-880. As soon as I hooked it up, I heard an unpleasant hum that I had not heard on the Satellit 800.

I decided to see if running the 1020C off battery would offer an improvement. This involved another challenge: there is no “hatch” on the 1020C to provide access for plugging-in the 9-volt battery. Instead, you have to take out the screws on either side of the cabinet, remove the cabinet top, find the 9-volt connector hidden in a little plastic sleeve inside the 1020C, plug in the 9 volt battery, slide it into its clip, replace the cabinet top, and run the screws back in. That, in itself, is not difficult to do, but as soon as the battery needs replacing, you have to go through most of the process all over again.

The good news is that once the 1020C was running off battery, I could detect no hum, and the experience with the 1020C with the PL-880 was much the same as with the Satellit 800. Some signals were improved, some were the same, and sometimes the straight-through (bypassed) signal was better.

I have not tested the 1020C with a large, signal-devouring antenna out in the fresh air. The 2009 edition of Passport to World Band Radio offered that, with an inverted-L antenna longer than, say, 50-75 feet, the 1020C may not provide much benefit. However, my experience with a modest 50-foot indoor end-fed antenna demonstrates that the 1020C can deliver a significant signal boost in some circumstances, and I am glad to have it in my shack.

Bearing in mind that it won’t improve every signal you want to hear, if you live in an antenna-challenged situation, the MFJ 1020C – particularly if you can get 20-50 feet of wire outdoors or run around the perimeter of a room – may be just what the doctor ordered.

Suggestions for MFJ

There are three areas in which MFJ could make life easier for 1020C users: (1) make a pigtail or other device available to get the signal from any wire antenna to the coax input of the 1020C, (2) make a pigtail or other solution to bring a signal from the output of the 1020C to a shortwave portable (possibly a pigtail with an alligator clip to connect to the whip antenna), and (3) offer or provide quick-release pins for the 1020C cabinet for those who wish to operate it off batteries and want to be able to replace them quickly and easily.

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Introducing the new SWLing Post Message Board!

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Friends, I’d like to share some good news with you!

The short version:

I’ve created an SWLing Post discussion board that anyone can join, free of charge, at SWLing.net.

My hope is that this will be a spot for community members to get quick answers to questions and connect with other like-minded operators.

Everyone is welcome and this board is already populated with a number of moderators who will make sure that all questions–no matter how simple–are welcome. Trolls and rude people will be weeded out.

I would encourage you to create an account and check it out: http://swling.net

The long version:

In the past, I’ve mentioned in posts that email from readers and subscribers (of both QRPer.com and the SWLing Post) has increased to a point that I can no longer keep up with them. It became very evident when I went camping in West Virginia last month and came back home to find no less than 60 messages in my inbox. These 60 messages were all ones needing some sort of reply or acknowledgement–they didn’t include notifications and SPAM.

I take pride in replying to each and every message I receive, but sadly I can no longer keep up with the volume. Sadly, I don’t have enough time especially with my busy family life.

In fact, I realized recently that replying to emails is actually taking a large bite out of the time I have to do content creation. I can’t let that happen, because that could quickly lead to burn-out. Both of my sites are pure labors of love and I enjoy them immensely. Continue reading →

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A little off-line, off-grid camping

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You might have noticed a lack of posts this weekend and that would be because I was completely off-grid and off-line, camping with two good friends in Pisgah National Forest.

It was brilliant, actually. I got to hang with friends I’ve known for over 30 years, test my new one person backpack tent (a.k.a. the “Bear Burrito”–the one on the right above), and of course I played a bit of radio.

Black bears are a fact of life here in the mountains of western North Carolina and we spotted three hanging out within 25 meters of our campsite.

By the way: the trick when camping with bears? Don’t put food in your tent, else that whole “bear burrito” thing becomes a reality.

I had a fabulous time putting my Elecraft KX1 “Ruby” on the air. I made perhaps 15 contacts in CW (Morse Code) with 3 watts of power.

One of the cool things about the KX1 is you can change the mode to SSB and actually tune through several shortwave broadcast bands (if you have the three or four band version of the KX1). Of course, I had to do a little SWLing.

As I mentioned in my previous post, I’m also a proper coffee snob and I firmly believe coffee tastes better when brewed outdoors. Yesterday morning, I brewed a pot of Rock Creek French Roast.

Off-grid, off-line camping recharges my internal batteries and it’s for this reason, I’ll be doing a lot more this year with my family.

It’s is also a brilliant way to experience an environment without any forms of radio interference (QRM or RFI). If you want to do some proper DXing, take your radio on some primitive camping experiences. It’ll remind you what life was like before switching power supplies ruled the world!

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Shortwave Coffee

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This morning, I was searching hundreds of half-finished articles I’ve accumulated on the SWLing Post over the years looking for a particular note. During my search, I stumbled upon the following post from September 2020 that I thought I published but had not. There’s no time like the present, right? Here you go:

A couple weeks ago, a package arrived at the post office and I noticed that the return address was from friend and SWLing Post contributor and Patron, Scott Gamble.

Scott knows me pretty darn well because, frankly, we’re a lot alike: we’re radio geeks and coffee snobs.

The confirmation was in the box. A Shortwave Coffee mug:

Turns out, Scott discovered Missouri-based coffee roaster, Shortwave Coffee. He shipped me one of their branded mugs and it has become a favorite here at SWLing Post HQ.

Next time I’m anywhere within driving distance of Shortwave Coffee, you’d better believe I’m stopping by for a cauppa!

Thank you, Scott!

Fast-forward to the present day and, as I type this, I’m sipping a nice Rock Creek French Roast in my Shortwave Coffee mug. Thanks again, Scott!

I should add that my buddy Troy Riedel also sent me a shortwave coffee mug–one he actually designed–nearly a decade ago. It lives in our travel trailer so I enjoy it during each of our family camping trips!

Here’s wishing everyone an amazing weekend filled with shortwave and coffee!

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X-Raydio on the radio

Paul receives a Funklust DRM QSL

Audio File:

KiwiSDR Screenshot:

The signal was picked up as far as New Zealand one told me. I think reception reports from all over the world would be very much appreciated …

Have a nice day. Best regards.

Paul JAMET
Radio Club du Perche

That’s brilliant, Paul. Thank you so much for sharing the recording and QSL info. Hopefully, they’ll continue to receive reports from across the globe. It might be fun, in fact, to see just how far one could DX this DRM broadcast via the KiwiSDR network. Frankly, good copy of Funklust’s 250W DRM signal in Portugal is pretty impressive!

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Radio Waves: Taiwan Radio Enthusiasts, ABC Radio Still Vital, Funklust DRM, and Democracy’s Reliance on Quality Information

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Radio Waves: Stories Making Waves in the World of Radio

Welcome to the SWLing Post’s Radio Waves, a collection of links to interesting stories making waves in the world of radio. Enjoy!

Many thanks to SWLing Post contributor, Eric Jon Magnuson, who has been taking an active role in helping to curate our Radio Waves tips.

Taiwan radio enthusiasts tune in as Chinese, U.S. warplanes crowd sensitive skies (Reuters)

SYUHAI, Taiwan, May 24 (Reuters) – Shortly after dawn on a southern Taiwanese beach, Robin Hsu’s iPhone pings with the first radio message of the day from Taiwan’s air force as it warns away Chinese aircraft.

“Attention!” a voice says on the radio, speaking in Mandarin to a Chinese military plane flying at an altitude of 3,500 meters. “You have entered our southwestern air defence identification zone and are jeopardising aviation safety. Turn around and leave immediately.”

Taiwan, which China claims as its own territory, has complained for years of repeated Chinese air force missions into its air defence identification zone (ADIZ), which is not territorial airspace but a broader area it monitors for threats.

Although Taiwan’s Defence Ministry details these almost-daily incursions on its website, including maps outlining the activity, a band of Taiwanese radio enthusiasts like Hsu has been tuning in to related radio traffic and publishing the recordings online. [Continue reading…]

ABC’s oldest medium, radio, still vital in a world of streaming and podcasts (ABC News)

Thelma Denny doesn’t know life without the ABC.

Now 84, the resident of Apple Tree Creek near Bundaberg, was born six years after radio announcer Conrad Charlton announced to the country: “This is the Australian Broadcasting Commission.”

As a young girl, Thelma remembers her father “always had the radio on”, especially for the cricket or her mother’s favourite long-running radio drama Blue Hills.

These days the radio is her comfort and companion, especially since her husband, Ronald, died in 2016, two days after their 58th wedding anniversary.

Still living independently, the great-grandmother loves nothing more than to unwind with Phillip Adams talking from her bedside table each weeknight as she falls asleep.

But ABC radio is also her lifeline, so when her radio went on the blink, Thelma was at a loss.

“That’s been the problem, I can’t get an update on the weather,” she said.

“If there is a storm on, I have to turn off the television and the computer which has the weather bureau site.”

In times of emergency, it’s recommended battery-powered radios are part of home emergency kits, with power outages, poor internet and phone coverage meaning many regional areas’ only source of information is the radio. [Continue reading…]

Funklust is back on air with a boost (Red Tech)

ERLANGEN, Germany — Funklust, a German Digital Radio Mondiale shortwave station that began broadcasting in 2003, has returned to the air after undergoing extensive improvements.

Funklust is the student radio station of Friedrich-Alexander-Universität Erlangen-Nürnberg in Germany. The station is a partnership between the university and the nearby Fraunhofer Institute for Integrated Circuits.

Friedrich-Alexander-Universität describes itself as “one of the largest research universities in Germany,” while Fraunhofer bills itself as “Europe’s largest application-oriented research organization.”

A joint effort

The students produce the program content and schedule. Fraunhofer handles the technical side of Funklust. Programming is mostly non-stop music, but it does carry a few external programs, such as Radio Goethe. The station was originally on the air as BiteXpress in 2003 and switched to Funklust several years later.

Fraunhofer recently updated the station’s equipment, and Funklust returned to shortwave in October 2021 after going off air in 2018.

The original transmitter was a 1,000 watt Telefunken S2525 DRM-capable transmitter. Fraunhofer replaced it with a new RFmondial 250 watt transmitter, which feeds the signal into a vertical lambda/four-monopole antenna mounted on a concrete mast at a height of 58 meters (just over 190 ft.)

A shortwave broadcast station typically broadcasts an analog signal using amplitude modulation. A single transmitter would only carry a single audio service, nothing more. By contrast, a DRM transmitter offers additional signal options, including the carrying of transmission information and other data. [Continue reading…]

Public Media and Direct Democracy (Public Media Alliance)

By Gilles Marchand, Director General of SRG SSR

“The fate of democracies will depend on their ability to produce and disseminate quality information.”

This article was originally published in Le Monde on 15 April 2022.

The debate surrounding funding for public service broadcasting is wide open and has, in particular, been covered by this newspaper. The French Presidential election campaigns have provided various different proposals, ranging from replacing the licence fee with an allocated budget to privatising the entire sector.

Clearly, this is a sensitive issue. It concerns a fragile ecosystem that has been disrupted by international pressure from streaming platforms and turned upside down by social media. It also fascinates politicians who enjoy the rush of being regulators, clients and media consumers all at the same time. Switzerland, with its direct democracy model, is an interesting testing ground as the citizens of this small multilingual and multicultural federal state get to decide regularly on the fate of the country’s public service with a vote.

Switzerland: a testing ground

As such, SRG SSR (Swiss Broadcasting Corporation) is the only public service provider in Europe to have come face to face with universal suffrage. In 2018, a referendum on abolishing all forms of public funding for it sparked fierce, unprecedented debate surrounding SRG SSR’s radio, TV and online programmes. The European broadcasting industry watched on in amazement as the battle lines were drawn between those for and against the existence of public service media. In the end, following a lot of intense campaigning, there was a convincing outcome at the polls as over 70% came out in favour of this public service and a licence fee which at the time amounted to around 360 euros a year per household! [Continue reading…]