Well G3XBM is always reminiscing about his time at PYE, I wish I could do the same for Thorn Automation days, but as most of the work was restricted very little of their products have made it into the Amateur world. .

Rogers recent ramble here made me reach for the desk drawer. Out I pulled a PF1 receiver still complete with case.



I cut my teeth on a PF1 with my first taste of 70cm receive back in the early 1980's. What I seem to remember I picked  up quite a few of these at a radio rally for about £5 each! But the crystal was about the same price again, which was required to replace the original to get them working on one lonely channel, or tuned up on a single repeater frequency, in my case being Stafford GB3ZI (433.275MHz). What I seem to remember tune up was quite a fiddle, they used to break into oscillation, as the pull was quite a bit out of the zone of where they had originally been working in the commercial world.






This one has seen better days, but most of it is still quite complete apart from the metal shield over the front end. The battery was rechargeable 9V long time expired, but soldering in a 3F23 or PP3 would make it burst into life. So as you can see I have been around quite a while to remember the older PYE generation, but not quite as long as G3XBM. :-)



Steve, G1KQH, is a regular contributor to AmateurRadio.com and writes from England. Contact him at [email protected].

Original shape of coupling loop

My last couple of posts have been dealing with extending the bandwidth of my MFJ 1788 loop antenna. With the loop the lower the SWR the more bandwidth I  have before I have to retune the loop. Up to this point I have tried moving the antenna ALL over my balcony and the best SWR at that point was at best 1.6 with the loop in the horizontal position. I then gave the loop a go in the vertical position something I had never done before. I was surprised that the loop had a better SWR, I was able to get it down to 1.4 SWR. One last suggestion given to me was to adjust the internal 10 gauge coupling loop. Today I took the section of the cover off that exposed this coupling loop and moulded the loop from it's "0" shape to more like an egg shape. with doing this I was able to lower the SWR do 1.2 to 1.3 depending on the band I was on.

New and improved shape

Mike Weir, VE9KK, is a regular contributor to AmateurRadio.com and writes from New Brunswick, Canada. Contact him at [email protected].

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Now, thanks to AmericanRadioHistory.com, most of those great old hobby magazines of the past can be viewed online and enjoyed once again.

As a pre-teen short-wave listener in the late 50's, I couldn't wait to get my hands on the latest edition of Popular Electronics, stuffed with its latest SW broadcast news, frequency lists and DX stories.






Thanks to David Gleason's work, I always have several of my favorite classics downloaded to my I-Pad's bookshelf for offline reading. With hundreds of recent updates this spring, there appears to be a lifetime of vintage reading now available!




As a builder of vintage-style radios, particularly transmitters, I can often find new inspiration from the magazines particularly devoted to ham radio. If your workshop library is lacking in vintage reference material, you need look no further than this site for a vast source of building inspiration....transmitters of all description along with receivers from crystal tuners to complex multi-tube designs.



So many of these early publications were the brainchild of Hugo Gernsback, a prolific writer and editor of both technical and science fiction magazines but sometimes blurring the boundaries of each! I suspect that his wide variety of radio publications had some significant role in the way radio so quickly transformed the world.
Even in the 50's, long after the 'golden years' of radio, it was not uncommon to still see radio antennas on most houses, at least in my neighbourhood!







If you haven't visited this wonderful resource yet, I'm sure you will be amazed at what you find.
Steve McDonald, VE7SL, is a regular contributor to AmateurRadio.com and writes from British Columbia, Canada. Contact him at [email protected].

The slow adjustment resistor

In my last post regarding the SWR on my MFJ 1788 mag loop I was suggesting that I wanted to get my SWR below 1.6 and I did get it too 1.4. The reason I want as low SWR as possible is I have better  band width before I have to retune the loop. One reader of my blog Paul VA3ZC also lives in a condo and has an MFJ mag loop as well. He gave me some great great suggestions, one being to go into the loop's control box
(the box used in the shack to tune the loop) and by adjust a certain resistor I could slow the  tuning down and maybe fine tune the loop to a lower SWR.  He also suggested reshaping the coupling loop that is inside the mag loop. I decided to give the resistor a go first. It's much easier for me to open the control box and adjust a variable resistor than to open the loop up and start adjusting the coupling loop and put the loop cover on and give it a go.

What was left of battery holders

I was able to adjust the resistor to the point were the tuning light was flashing about 3-4 times per second as Paul had informed me that his loop had been adjusted to. Once done I gave the tuning process a go and it turned out the lowest SWR I could get was 1.7! I tried moving the loop all over the balcony and it made no difference. I found at a slower speed the SWR would jump very fast from 2.0 to 1.7 and bang back up beyond 1.7. It's not that Pauls suggestion was incorrect but these loops are very funny bunnies. I did take a picture of where the variable resistor was before I began the adventure and I decided to put it back to that adjustment. Low and behold I was back to the 1. 4 SWR. If I want  my next adventure will be to adjust the coupling loop inside the antenna housing BUT I just don't want to get myself in a "I wish I just had let things well enough alone" situation. I did find when I opened up the mag loop control box the battery hold turned very brittle and was falling to peaces as I handled it. The control box can run off batteries if need be but not this one until I replace the holders. With the Christmas season on us I will once again have to ask my readers to hold on with regards to the Sun SDR2 Pro SDR radio update.
Mike Weir, VE9KK, is a regular contributor to AmateurRadio.com and writes from New Brunswick, Canada. Contact him at [email protected].

In this episode, Martin M1MRB is joined by Chris Howard M0TCH , Martin Rothwell M0SGL, Dan Romanchik KB6NU, Ed Durrant DD5LP and Frank Howell K4FMH to discuss the latest Amateur / Ham Radio news. Colin M6BOY rounds up the news in brief and this episode’s feature is When HF is Quiet.

ICQ AMATEUR/HAM RADIO PODCAST DONORS

We would like to thank David Cripps (G7IDB) and Bill Seward (KG4SAQ) along with our monthly and annual subscription donors for keeping the podcast advert free. To donate, please visit - http://www.icqpodcast.com/donate

• National Security Risks with Amateur Radio Violations
• The CWops Award 2019 for advancing the art of CW
• 1940s Radio Times now online
• WSJT-X 2.0 Full Release now Available
• "Suspicious" Post Office Package Was Ham Radio Equipment
• Worked All Postcodes
• 2018 QST Antenna Design Competition Winners Announced
• Scouts at AJ2019 Awaiting Amateur Radio Call
• Logbook of The World Tops 1 Billion QSO Records
• New Amateur Radio Packet Gear for International Space Station

Colin Butler, M6BOY, is the host of the ICQ Podcast, a weekly radio show about Amateur Radio. 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.

Stories you’ll find in our December, 2018 edition:

The Beginnings of FM Radio Broadcasting
By John F. Schneider W9FGH

We take broadcasting on the FM band for granted today, but getting to this point required early proponents of FM broadcasting to fight every step of the way. Among FM foes were the giants of AM broadcasting; the emerging powers behind television; that rascal David Sarnoff of RCA; even the FCC itself and the fact that there were only 25 FM receivers in the entire world. John explains all the things you don’t know about FM radio (including the fact that Edwin Armstrong didn’t invent that method of modulation—by a long shot) and how FM almost died in the aftermath of World War II.

The EICO story; the Electronic Instrument Company and its Kits
By Rich Post KB8TAD

Founded in 1945 by Harry R. Ashley, with an investment of $1,500, EICO was a competitor of Heathkit and Allied Knight-kits in the heyday of kit-built test equipment, audio products and ham gear. All those kits are now in the nostalgia category, but because they were well documented, mostly put together with screws rather than rivets, they can still be repaired and used. In fact, Rich tells us that some of the ham and audio gear and certain useful pieces of test equipment have become quite collectible. Rich also explains how, despite a shift to consumer electronics audio gear, like Heathkit and Allied Radio, EICO never made it past the computer era.

Classic Rock Era is Alive on Shortwave
By Ken Reitz KS4ZR

There’s something about Classic Rock music that just won’t fade. And, anyone who remembers shortwave radio programming in the 1970s and 80s, knows that rock music was readily found on the shortwave bands from the BBC and VOA’s regular music programming to private American shortwave stations such as WRNO “The Rock of New Orleans,” and Radio New York Worldwide. But thanks to programming on WTWW, WRMI, Radio New Zealand International and the Mighty KBC, the bands are alive once more with the pulsing sounds of Classic Rock.

BCB DX’ing With That Old Transistor Radio
By Richard Fisher, KI6SN

You have to wonder how many AM transistor radios have been relegated to the back of our junk drawers because “they just don’t work very well.” A reasonable guess would be in the seven figures over the decades. For strong local stations that may be just fine, but for the BCB DXer, the shrinking antennas bring awfully discouraging results. These transistor portables are more prone to local manmade interference as well. Richard shows us an easy and inexpensive solution to this dilemma in a tunable AM broadcast band loop antenna. Follow his step-by-step instructions and make even your transistor radios perform.

Scanning America
By Dan Veeneman
Fayette County (GA) and Intro to ULS

Federal Wavelengths
By Chris Parris
Federal Wavelengths 2018 Wrap Up

Milcom
By Larry Van Horn N5FPW
Monitoring Santa Claus, NORAD and Combat Air Patrols

Utility Planet
By Hugh Stegman
Chasing Italian MF Coastal Stations

Shortwave Utility Logs
By Hugh Stegman and Mike Chace-Ortiz

VHF and Above
By Joe Lynch N6CL
CubeSats go to Mars

Digitally Speaking
By Cory GB Sickles WA3UVV
Complex Simplex

Amateur Radio Insights
By Kirk Kleinschmidt NT0Z
Confessions of an Autotuner Abuser

Radio 101
By Ken Reitz KS4ZR
Chasing AM Band DX: Then and Now

Radio Propagation
By Tomas Hood NW7US
Winter DX is at the Door

The World of Shortwave Listening
By Rob Wagner VK3BVW
Propagation Tools, Wire Antennas and DX News

The Shortwave Listener
By Fred Waterer
New Programming from Spain and Greece Plus: Christmas Around the World

Amateur Radio Satellites
By Keith Baker KB1SF/VA3KSF
Amateur Radio Satellite Primer (Continued)

The Longwave Zone
By Kevin O’Hern Carey WB2QMY
SDR Startup: It’s a Wrap!

Adventures in Radio Restorations
By Rich Post KB8TAD
Recollecting My First EICO: The 425 Oscilloscope

Antenna Connections
By Dan Farber AC0LW
First Antenna: The Selection Process

The Spectrum Monitor is available in PDF format which can be read on any desktop, laptop, iPad®, Kindle® Fire, or other device capable of opening a PDF file. Annual subscription is $24. Individual monthly issues are available for $3 each.

Ken Reitz, KS4ZR, is publisher and managing editor of The Spectrum Monitor. Contact him at [email protected].