SolderSmoke Podcast #239: Hex DX, VFO Temp Comp, DC RX, Polyakov!, DX-100, Wireless Set, Farhan's "Daylight Again" HDR rig, MAILBAG

N2CQR Hex Beam Aimed at Europe

SolderSmoke #239 is available for download: 

http://soldersmoke.com/soldersmoke239.mp3

TRAVELOGUE: 

James Webb Space Telescope.  Mars returning to opposition in early December.   

BILL'S BENCH

Hex Beam K4KIO - on roof – TV Rotor – 20-17-12  Lots of fun.  Working Japan regularly, Australia, South Africa on long path 17,000 miles.  52 countries SSB since July 11.

VFOs and Temp stabilization.  Dean KK4DAS found my ceramic resonator VFO for DC receiver drifty. He was right.  So I built a real LC Colpitts VFO.  Got me into temp stabilization.  A new hobby!  An obsession.  HT-37 and Ht-32 parts. Ovens?  WU2D’s second VFO video.  Understanding thermal drift and how to address it. Split stator caps.  Cut and try.  

Built a Polyakov DC Receiver. https://soldersmoke.blogspot.com/2010/03/polyakov-plus-dual-band-receiver-with.html  Lauser Plus.  Lauser = Imp or Young Rascal!  DK2RS.  He used a ceramic Resonator VXO at 3.58 MHz.   Mine works great on 40 with VFO running 3.5 -- 3.65 MHz. See schematic below. 

On 40 AM with DX-100 and MMMRX.  DX-100 died.  12BY7 VFO buffer went bad.  How common is failure in this tube type?  Nice QSO with Tim WA1HLR about the DX-100.

Got my Dominican license:  HI7/N2CQR!  SSSS on the way.   Thanks to Radio Club Dominicano and INDOTEL.

Getting more active in the Vienna Wireless Society.  

BOOK REVIEW:  

"The History of the Universe in 21 Stars” by Giles Sparrow.  Written during the pandemic.  Published by Welbeck, in London. https://www.amazon.com/History-Universe-21-Stars-imposters/dp/1787394654  Also:  From “Atoms to Amperes” by F.A. Wilson available for download.  See blog.

SHAMELESS COMMERCE DIVISION:   

Todd K7TFC getting ready to launch “Mostly DIY RF.”   I used his TIA boards in my 1712 rig.  He will have boards like this and much more.  Stay tuned.

I need more viewers on YouTube.  They want 4,000 hours IN A CALENDAR YEAR!  Please watch!

FARHAN’S NEW “DAYLIGHT AGAIN” RIG.  Analog.  VFO.   Comments, observations. We need to get him on the podcast.  Maybe two shows: SDR and HDR. 

PETE'S BENCH

Time very limited. But still sharing lots of tribal wisdom.

Wireless set with tubes!

Tool recommendation – Air compressor

 MAILBAG:

Farhan VU2ESE – Speaking of big antennas “Whenever I look at the huge construction cranes in Hyderabad, I always think how one could make 160m, 4 element yagi using it as a boom..”

Todd K7TFC in Spain, spotting Log Periodics in Madrid.

Andreas DL1AJG:  Can Biologists fix Radios?

Janis AB2RA Wireless Girl.  Expert on Hammarlunds.  And was my first contact with the Tuna Tin 2. She too was HB!

Peter Parker VK3YE on Owen Duffy VK1OD

Lex PH2LB on homebrew radio

Would this really be homebrew?  Mail from H-A-D article on FM receiver

F4IET a DSB rig from France

Ciprian got his ticket YO6DXE    

Josh G3MOT sent us a good video about the Vanguard satellite and IGY.

Dave Wilcox K8WPE bought Chuck Penson’s Heathkit book.

Rogier -- So many great articles and links from PA1ZZ

Bill AH6FC  Aloha. Retiring.  Wants to build.  Mahalo!

Grayson KJ7UM  Working on an Si5351.  Gasp.

Mike KE0TPE viewing YouTube while monitoring 6 meters.   He will have a lot of time to watch!

Chris KD4PBJ spotted Don KM4UDX from VWS FB

Mark WB8YMV building a superhet.  Having trouble with 455 kc IF can filter.

Walter KA4KXX Great comment on the Daylight Again rig. 

Ramakrishnan Now VU2JXN was VU3RDD.  Found lost Kindle with SolderSmoke book on it. Building SDR rig from junk box.  Trouble with the LM386. 

Pete, Farhan and Tony:  Shelves of Shame

Daylight Again by Farhan

The Polyakov receiver I built yesterday (from SPRAT 110, 2002!)

IGY! Science and the Vanguard Satellite in 1959 (video)

The International Geophysical Year (1958-1959) was a very scientifically productive period.  It is really amazing how much we learned from tiny satellites like Vanguard.  Like the shape of the Earth!  Great stuff in this video.  

Very cool telescopes and cameras set up around the world to monitor the early satellites.  And there is a quick mention of ham radio efforts to monitor the new spacecraft. 

Thanks to Josh G3MOT for sending this to us. 

Go IGY! 

Buy a Real Sputnik Satellite! Let's Put Sputnik Back in Orbit!

Only 85,000 Euros (that's the opening bid).  But hey, it comes with the receiver pictured on the right.  I guess that's so you can listen to the beeps. 

Here's the description: 

---------------

Laboratory Test Model of "Sputnik 1 EMC/EMI", 1957
1:1 scale test model of the satellite "Sputnik-1", serial no. "0K6-1/004/1957", with built-in transmitter (including modern 12-volt power supply), polished stainless-steel sphere, consisting of two threaded hemispheres of approx. 23 in. diameter with two pairs of antennae of 95 in. and 105 in. at an angle of 35 degrees to the axis, on stand with O-ring, stand approx. 59 in. high, stand and model together approx. 79 in. high, accompanied by a Tesla Maj 620A radio receiver, manufactured in Prague c. 1956, restored working condition, including replacement of the silver-zinc battery with a modern alternative and a new metal casing for the electronic transmitter. Note: Built at the Experimental Design Bureau-1 (OK?-1/OKB-1) factory, also known as S.P. Korolev Rocket and Space Corporation Energia, Koroljow, Soviet Union, in 1957, shortly before the launch of Sputnik-1. - An impressive artefact from the dawn of the space age, of which few models are known. - Provenance: From the collection of Dr. Frank Malina, USA/CSSR.

Start Price: EUR 85.000

---------------------------

I'm a bit suspicious of the "modern 12-volt power supply,"  the "modern alternative" battery and the "new metal casing for the electronic transmitter."

Here's the link to the auction: 

https://www.the-saleroom.com/en-gb/auction-catalogues/auction-team-breker/catalogue-id-breker10030/lot-9c87007d-f0ff-4414-9663-adc200690819

Here's my suggestion:  Musk or Bezos or Branson should buy this thing, fix it up a bit, and put it back in orbit.  So we can listen to it again. I know a version of this was done back in 1997.  But I think we should do it again, this time with the actual test model. 

Here are the earlier SolderSmoke blog posts about Sputnik and Sputnik-related projects: 

https://soldersmoke.blogspot.com/search?q=Sputnik

Steve Silverman sent the auction posting to me.  Thanks Steve. 

It just so happens that earlier in the week I was out at the Air and Space Museum facility near Dulles Airport, where I saw this flight backup of the Vanguard satellite: 

Preserving Vanguard 1

Ira Flatow of "Science Friday" was recently talking about how best to preserve important bits of the history of mankind's exploration of space.  Our old friend Vanguard 1 was mentioned several times.  It is now the oldest satellite still in space.

You can listen to the Science Friday show here:

http://www.sciencefriday.com/segments/protecting-the-historic-human-record-in-space/

They also have a transcript of the show on the same page.

SolderSmoke fans will remember the Vanguard adventures of Mike Rainey AA1TJ:

http://soldersmoke.blogspot.com/search?q=Vanguard

This seems to be the month for Vanguard:  just a couple of weeks ago, on 40 meters I spoke to Dale Parfitt W4OP. Dale was one of the first people to pick up Mike Rainey's Vanguard replica signals (see link above).

AND...

The Vanguard reproduction project came up during Eric Guth 4Z1UG's "QSO Today" interview with Graham Firth G3MFJ of the G-QRP Club:

http://www.qsotoday.com/podcasts/g3mfj

(Graham has such a great voice.  He definitely SHOULD build a phone rig!)

VIVA VANGUARD!  
  

"Receiver Here is My SWR meter OM..."

Santa managed to include in his delivery some of the materials that I needed to build my 160 meter inverted L antenna.   You see, Steve Silverman, Pete Juliano and I have collectively more than 150 years in ham radio, but none of us have ever operated on Top Band.  The three of us have taken A SOLEMN OATH to correct this horrendous deficiency.   I am in the vanguard, partly due to a weather pattern that is perfect for antenna building. 

Armed with a new elastic band for my Wrist-Rocket sling shot and some perfectly shaped lead sinkers,  yesterday -- with the obvious cooperation of The Radio Gods -- I managed to get two ropes over some 70 foot trees.  Soon -- with minimal gnashing of teeth -- I had 185 feet of wire in the air. 

This morning I was messing around with L networks at the base of the antenna.  I took a coffee break, leaving the 185 foot wire and the ground system connected to the coax.   I had the transmitter off, so I was surprised to see the SWR meter jumping around a bit, up significantly from zero.   What could that be?  It wasn't coming from my station, so it had to be coming from some other transmitter. And the slight bit of jumping that I saw on the SWR meter had the familiar pattern of the human voice.  Some radio sleuthing ensued.

I flipped the station antenna switch to the  "bench" position, and connected my scope to the coax.  Wow!  I immediately saw a big strong AM signal with modulation, at about  5 or 6 volts peak to peak.  The Rigol 'scope gave the frequency:  1220 kHz.  

I tuned the HQ-100 to that frequency.  As I listened to Gospel broadcast, I could follow the voice peaks on the 'scope. 

Some Googling ID's the station:  WFAX 1220 AM.   5 kilowatts in the daytime.  1.5 miles from my house.  The vertical portion of the inverted L is obviously picking up a LOT of energy from the WFAX tower.  And the horizontal portion of my antenna is broadside to the WFAX tower.

Of course this all made me think about throwing together a crystal radio, but then I realized I'd already listened to WFAX with simple diode -- the one in my SWR meter.  That little SWR meter was acting like a crystal radio with a visual output!     

Vanguard!

Wow, Vanguard even looks like a QRPp satellite. 

I suspected that something was up:  I noticed that Mike Rainey, AA1TJ has recently been crossing pond with a QRPp Germanium rig...  Then Steve "Snort Rosin" Smith clued me in: The next period of  Vanguard QRPp Activity Days begins tomorrow.  "Club 72" has a nice write up, and a nice collection of pictures of the Vanguard rigs that have been built around the world:

http://www.club72.su/vanguard.html

Go Germanium!  Go Vanguard!

Our book: "SolderSmoke -- Global Adventures in Wireless Electronics" http://soldersmoke.com/book.htm Our coffee mugs, T-Shirts, bumper stickers: http://www.cafepress.com/SolderSmoke Our Book Store: http://astore.amazon.com/contracross-20

Sputnik Party 2012 Soapbox

Poster by Steve "Snort Rosin" Smith

3 October from AA1TJ:

Here's an admittedly late reminder that the Sputnik Party begins
tomorrow (4 October). I've been preoccupied with non-hobby concerns in
recent months but I did manage to throw something together for the
event.

My transmitter follows the lines of the 10mW, battery-powered, RF
beacon that was carried into orbit in 1958 by "Vanguard 1." You may
recall this is the one Premier Nikita Khrushchev characterized as "the
grapefruit satellite."

My present build uses essentially the same circuitry and componentry
as did an earlier, 20m version; details of which can be found at

http://aa1tj.blogspot.com/2012/06/vanguard-1-satellite-transmitter.html

The 15m version drives a 44m end-fed wire with 30milliWatts.

The receiver that I built for the event is essentially a "Q-multiplier
-> detector" type regenerative job. However, the Q-multiplication is
accomplished by a parametric amplification using a quartz-crystal
controlled pump. I thought it would be historically appropriate given
that parametric amplifiers were all the rage in the late 1950's.

I put together the keying and R/T changeover circuitry this morning.
When it appeared that "all systems were go" I began sending CQs on
21.060MHz. The band, or at least that portion of the band (the
receiver only tunes from 21.060 to 21.064MHz), seemed rather quiet,
but my 6th call netted a "dit dit dah dah dit dit." Resending my call,
I was very pleased to hear HB9DCL come back to me from just outside of
Zurich. The reports were 579/339. Frank was running 5W to a log
periodic antenna. I sure hope this is a sign of things to come!

I hope to be at the key by 1300Z tomorrow. Although my little
"grapefruit" only puts out 30mW, folks running "Sputniks" made from
ex-Soviet subminiature "rod tubes" should be at least two S-units
stronger. A number of European stations will be operating this year
and at least one station that I know of will be QRV from Japan. Just
listen for the beeps and give them a call!

Thank you,
Mike, AA1TJ

.......................

04/10/12  ( first day)

dear friends &Sputnikers

today a Belgian "sputnik clone" crossed the pond

first hit

15:22 with N0UR a 2 x sputnik "solid" QSO

Jim wrote: Thanks QSO, here is how you sounded in MN

( in attach)

16:00 second hit with AA1TJ , Mike "the inventor of all this Sputnik madness" hix 3 

this time a bit more difficult but at last we could manage to exchange reports,

between the QRM and noise at last got confirmation , 

Mike's sigs  here where 339 but still copyable

all OK with my 559 sigs then suddenly some other sputnikers came on the scene and I lost Mike

nevertheless

with my 60 years again excited as a young boy

as we made some history today hi x 3

will take a picture

for the moment a complete mess as the DC/DC invertor inside the sputnik  broke down

lost the very early contact with UA1CEG suddenly no more power in the SPUTNIK-cabine LOL

had to drag my new testbench power supply (still under construction )

or  lot of things to fix for those lausy 700 milliwatts hahahaha

73 to all

Jos

ON6WJ

.................................

News flash...Sputnik worked Vanguard across the pond. I just sent this
letter to some of the guys

Dear Friends

I won't forget this morning's QSO with ON6WJ anytime soon! As he
beeped/called CQ I could hear him riding on waves of QSB. I kept
hoping he would end on the top of the wave. It happened one time and
Jos sent "AA1TJ?" but by the time I re-sent my call we were back in
the trough of the wave. He started calling again and once again I
crossed my fingers. Finally it happened, he ended on top of a
particularly strong peak...and sure enough, he copied my callsign. It
took more effort to exchange the reports but we eventually did it! He
confirmed my 559 and I did the same for my 339 report. It must be true
that anything worthwhile doesn't come easy, because the more difficult
the QSO the more I seem to enjoy it! I copied Jos' info: "SPUTNIK PWR
700mW = ANT 3EL YAGI" perfectly on my tiny receiver. Just as amazing,
he copied my 30mW transmitter made from one PNP Germanium transistor
dating from September of 1959. Needless to say, I'm a happy camper
today. Merci Beaucoup, Jos.

Just above my operating frequency I heard PA0PJE sending "CQ Sputnik."
You had a beautiful signal here, PJ! It was easily S6 on the peaks. My
transmitter frequency trimmer adjustment is buried in a rat's nest of
wires which I didn't dare stick my hand in so early in the day.
However, if I hear you again I will definitely risk it.

Thanks Carlo/IZ4KBS and congratulations on your Russian QSO. Any
contact all with this simple stuff is reason for a celebration!

...and now back to the Hobbit Hole for another dose of QRPp.

73/72,
Mike, AA1TJ

Our book: "SolderSmoke -- Global Adventures in Wireless Electronics" http://soldersmoke.com/book.htm Our coffee mugs, T-Shirts, bumper stickers: http://www.cafepress.com/SolderSmoke Our Book Store: http://astore.amazon.com/contracross-20

AA1TJ -- As always, in the Vanguard

Here is a recent e-mail exchange between Michael, AA1TJ, and Dale, W4OP.  (Dale happens to be the fellow who built the W1FB Barebones Superhet that I am currently using on 17 meters. Details on this caper appear in SolderSmoke -- The Book). 


----------------------------------------------------
From AA1TJ: 


Wahoo...Dale, you amazing!

You are my first QSO with the Vanguard 1 reproduction satellite beacon transmitter. My circuit is a fairly close copy of the one shown on the lower left-hand corner of the 1959 CQ Magazine article (notice the output signal pick-off shown in this schematic is incorrect, or at least incomplete). My circuit uses link-coupled output impedance matching, which is similar to the only other documentation that I was able to dig up. The attached image "Early_Microlock_Bcn.jpg" was snipped from an original NASA report on the transmitter used in early airborne and sub-orbital tests leading up to the Vanguard flights. 

Yes, you heard correctly. I'm using a Philco 2N504 surface-barrier transistor, but please let me back up a bit. 

Roger Easton (a native Vermonter...and still resides here!) was at the helm of the communications development for the Vanguard/Minitrack project. Of the Vanguard "grapefruit" satellite beacon transmitters, he wrote in the May 2008 issue of High Frontier magazine

"We tried subminiature tube transmitters first. They worked marginally. Finally, Bell Telephone/Western Electric developed a very nice transistor for the task, and the problem was solved." 

However, that leaves out a small detail. They first tried Philco surface-barrier transistors, which worked fine on the bench, however two problems were discovered. They were found to be too temperature sensitive; the RF output power from the one-stage transmitter dropped excessively at elevated temps. Secondly, there was some issue with the packaging that produced erratic operation when the transistor was rotated positionally. The Western Electric devices proved better on both counts. 

The WE transistor appears to be "unobtainium" these days. That, plus the fact that my circuit won't be flying up to space anytime soon, prompted me to settle on a Philco 2N504. Although my device was manufactured in September of 1959 (Vanguard TV-4 - re-Christened "Vanguard 1" - first orbited on March 17, 1958), the 2N504 was an off-the-shelf item on the launch-date.

The only other obvious difference is the Vanguard 1 beacon circuit operated on 108MHz, whereas mine is presently working on 14.0596MHz. I recently had it running as a beacon on 10m for 48 hours but I had no luck given present band conditions.

The receiver is a simple, 0-V-0 regenerative set using a single Raytheon QF721 (fabricated in February 1953). I heard little activity on 20m when I started up my auto-keyer this morning. I had it looping 3X1 CQs whilst I worked on another project. To make matters more difficult, the exhaust fan was running in my shop and it happened to be raining heavily when you called. Worse yet, the receiver had drifted off my calling frequency by the time you called. I barely discerned a high-pitched CW "1" or "J"...which prompted me to quickly switch off the fan and re-tune. You were subsequently a solid 579. 

Of course my heart jumped when I heard you calling me...how I love that feeling! And it was a fabulous QSO so far as I'm concerned. Following our contact I opened my metal index card file box and pulled out the QSL that you sent to me following our "Code Talker" QSO. To think I now have another happy memory to add to that one! Thank you once again, Dale. It figures you'd be the one to pick-off my unannounced presence on the 20m QRP calling frequency with 25mW. Well done, OM. 

Also, you might enjoy this video of the actual launch, including some interesting control room audio banter. It may be found here: http://www.nrl.navy.mil/vanguard50/index.php. The way at least one of them nervously repeats, "Keep going baby!" gives some indication of the pressure these guys were under...having failed so spectacularly on two previous occasions. 

All the best,
Mike, AA1TJ    
        

On Mon, Jun 25, 2012 at 11:51 AM, Dale Parfitt wrote:

Hi Michael,

That was fun!

I first heard you on my SG-2020 rig, but did not have a paddle handy, so I fired up the K3. I don't ever recall having QRN on 20M, but it was  bad. Without it, you were 579 and even with it, 569 towards the end of the QSO.

I just happened to be QRV on 060 listening when I heard your CQ's. Not bad for a 25mW signal from (I think you said) a Philco transistor.

73,

Dale W4OP

Our book: "SolderSmoke -- Global Adventures in Wireless Electronics" http://soldersmoke.com/book.htm Our coffee mugs, T-Shirts, bumper stickers: http://www.cafepress.com/SolderSmoke Our Book Store: http://astore.amazon.com/contracross-20