Did You Contact My Novice Station WN2QHL in 1973-1974? Please Check My List and Let Me Know

Yesterday I went through my novice logs from 1973-1974.  I was in Congers, NY and my call was WN2QHL. Please take a look at the callsigns from my log and let me know if we had a contact.  I will then let you have more details from my log. 

Novice Contacts 1973-1974 from WN2QHL

WN2NEC

WN2RTH

WA4DCL

WN4CBB

WN9LLX

WN1RWX

WN4ETR

WB2CSO

WN8QHM

WN8ONA

WN4KID

WN8PMF

WN2INN

WN2ECU

WN4DSO

WN3UCL

WN4KBL

WB4WDQ

WN0IHH

WN9MNW

WN8ODW

WA8VCH

VE1BAD

WN8NIJ

WN8MYJ

WA3TKP

WN2GMQ

WN8LDI

WN5JZP

WN5JXZ

WN2PNQ

WN2HKY

WB2PPP

WN4EIS

WN4DNV

WA8WIK

WN3TPJ

WN1RRR  WN1RPR?

W2MJR

WN2SHL

WN3TZR

W1DUQ

WN2ROW

WN2SLA

WA3HNZ

WN2JXT

W2HAG

WA2CDE

WN8ORL

WN4FYL

WN1PXM

WN2FPQ

WN4ZFF/3

WN3VDU

WN8QPJ/8

WN3TBW

WN4BWT/4 OR BWJ

W9MZO/9

WN1SLG

WN0KTR

W9KCT

WN3VKH

K1BXZ

W1AW

WA2QNX

K2BBU

K1BXZ

WN2ROZ

W1TRS

VE3FMF

WN3UPO

K1OOL

WN2RNJ

WN2KWK

WA2CDE

WN2JDE

WN3UQO

WN2IZY

W3CNN

WN2NNA

WB2EVS

VE2AJQ

WN1SBE

WN4ZIN

WA2JXM

WA3TVE/3 OR JVE OR UE

WASQWF

WA3JRU

W3ABT

WA2IWX

WN3FLK

WN1RZW

WN3TBW

WB2PYM

WN1RXM

WN2ERU

WB8HHN

WN2LVV

WB8JBM/8

WN2TEO

K4LDR

WN2EHE

K8MFO

WN2NAE

W3IN

WN3SZX

WA1EOT

W2MUM

WA2UOO

WB2RKK

W4KFL

WN2NEC

WN4EJJ

WN1SCL

WN2NQL

WA1RXJ

WA2YAS

WN2QHN

WN8POK

WB2ABJ

WN1QKD

WN2SDO

WN1SRT

WN2KOH

WN8DOB

WN1SQM

WN2SXT

W2HN

WA1RFF

WN2VNA

WN1RME

WB4YNY

WB8ALE

WN4AQM

WN4DMO

WN3USU

WN8NXE

W2HAG

WA1KLB

WB2NDL

WN2JXG

WN1RIP

WN2LKN

WA3IYA

WB9LJS

WN2RPL

K1BOM

WN4GOC

WN8QGO

WN8OPB

WN8OOE

WN2SAM

WN4FXN

WB2SXD/2

WN2IQM

WN3VUU OR UUU?

WN8PGD

WN8PIU

WN8OGY

WN8OWD

WN8OHP

WN9JOI

WN2GMQ

WN3VUR UR UUR

WN2LOC

WN2SAM

WN2TJQ

WA43PM

WA4YDR

WN9LDS OR LOS

WN9LSR

WN3UDR

WN1RGU

WA1RYL

WN2LBO

WN1RIM

WN2TAG

WN2TLQ

WN8ODP

WN2TBB OR JBB

WN4CRZ             First QSO with DX-100

WN4HKG

WA6TLH/HK6         FIRST DX  40 METERS   Feb 23 1974

WN2JHP

WN2TAS OR JAS

WN8QXR

W4DRJ

WN4GBX

WN4DAQ

WB8KUQ

WN4BPN

WN2SAM

WN8OVW

VE3GXX

WN0JOZ

WN6CPQ

WA4CNL

WN0LLT

WN0KUU OR KVU OR KUV

WN8QIN

WN4HLQ

K0IEU

WA1DWL

WN4GUF

VE1IC

WN4FOM

K2AVX

WA9AKY

VE2DJB

WN4EDQ

WN8PLH

WN2TPD

WN1SZS

WN4HRC

WA0WTV

VE3HEF

WN3UOO

K2IY

W4AHN

WN8OIF

WN9NYO

VE3AFX

K1PNB

K5EQX

WB6ALD

WB6LUS

WN0LQE

WA1POJ

WA5RFT

WN8NYU OR V

WN4GUF

K1BXZ

WN5GTE

WB5GDN

WB5GEN

WN2TJQ

WN2JXT

WN4CQX

WA1ASU/1

WN2IOJ

WN4GMY

WN2RUZ

WB8PRJ

WN4BTL

WB8MOI

VE3AGY

W8JEI

WN3VUZ

WA2CME

WN5KYK

WA1JUY

WN2NIL

K3DHD/9

WN4CTJ OR CWJ OR WUJ OR CVJ Gadsden AL.

WP4DRE/5

WN2GMQ

WN1SIP

WN9MOS

WN9OCO

WN2UAC

WN8NPY

WB5DIZ

WN2JHD

WN2RYH

WN2RXL

WB8OFU

WN8RTU

WN8MTW

WN8PIY

WA8JPC

K1OOL

WB2MYV

WN4CNE

WN4DXW

WN2PHE

WN8MYJ

WM2TTQ

WN4AYX

WN4ECB

WNOJGT

W4UHF

WN4FPU

WN8QCV OR U

WN8PCV

WN2STZ

WN2KLX

WN2FUN

WN2SLF

WN8RTZ/9

WN9MLY

WA7SCG

KP4USN

WN2UMV

WA6ARG

WA4BPS

WN9MAO

WN5HRI OR 4

WN2PWM

KZ5VV

ZL2ACP

WA6UUR OR VVR JACK IN Pasadena

KN5KSX

YU1NFT

YU2QZE

WA7STW

WN8RIK/4

WN2UMU

WN2PNQ

WN2QCE

YU2QZ

WN2TJQ

Save $2970! Build this $30 DIY Microphone!

There are a number of good ideas in this video.  We've known for a long time that many expensive mics are really simple, cheap mic capsules in fancy packaging.  This video takes a $12 mic capsule (which looks a bit like the ones we are using for the podcast), adds come amplification, a USB interface, and some really cool looking bronze packaging to come up with a very nice microphone. 

I liked his use of solder wick as a shield for the DIY mic cable.  Who knew the wick was hollow!  I also like the cooking torch for use in soldering the brass.  I need one of those. The little Murata DC voltage booster with positive and negative output seems useful. 

It seems that anyone working on this kind of project quickly gets pulled into the use of "audio speak." Late in the video Matt says his mic has nice low-end "presence."   A quick look at the comments section shows one person saying that one or the other of the mics sounds a bit "moist."   

There are many other similarly interesting projects on Matt's YouTube channel:

https://www.youtube.com/c/DIYPerks/featured

JPL, Mars Helicopter, Cube Sats, Ham Radio and more: N5BF talks to Eric Guth 4Z1UG

This morning Eric Guth has a really interesting interview on his QSO Today podcast.  

Courtney Duncan N5BF had a full career at JPL and is the current president of the San Bernardino Microwave Society.  There is a lot of interesting stuff in this interview, much of it about space exploration.  Courtney tells us about how experience with re-purposing radio gear came in handy at JPL.  For example, the helicopter that they have been flying on Mars has a very cheap and light off-the-shelf Zigbee transceiver.  He also talks about the origins of the Cube Sats.   

Here is Eric's page on this interview, with useful show notes: 

https://www.qsotoday.com/podcasts/n5bf

I like to listen to Eric's shows on YouTube -- here is the YouTube recording of the N5BF interview: 

https://www.youtube.com/watch?v=Fbr4jE11vfg

Here is N5BF's ham radio web site: 

http://cbduncan.duncanheights.com/HamRadio/HamRadio.html

Here is the club page of the San Bernardino Microwave Society:

http://www.ham-radio.com/sbms/

Thanks to Eric and Courtney! 

M0NTV's "Crystal Filters for the Fearful" (video)

I really liked Nick M0NTV's approach to making a crystal filter (see video above).  He really simplifies a process that desperately needs simplification. I remember when I was building my first superhet receiver,  I came across Doug DeMaw's schematic for a crystal tester that would allow me to properly build the filter.  But the piece of test gear was far more complicated than the receiver I was building.  I never built Doug's device. 

Nick's technique is simpler even than the G3UUR method that many of us have been using for years.  Nick dispenses -- wisely I think -- with the need to calculate motional parameters, Q,  and equivalent series resistance.  This also eliminates the need to fidget around with the design software such as Dishal or AADE.  

Nick uses the Cohn topology (good choice) and uses kind of an "informed cut-and-try" technique to come up with the capacitor values.  

Filter impedance is determined with series trimmer resistors and the NanoVNA to watch the resulting passband.  Nick says this is a Charlie Morris ZL2CTM suggestion.  It obviously works very well -- the ripple that would result from impedance mismatch is eliminated.  

Nick's determination of the best turns ratio for the impedance matching transformers is brilliant.

Nick apologizes for what he says is a long video.  But it is only 30 minutes or so long, and if you are going to build your own superhet or SSB filter rig, it is well worth watching.   

Three cheers for Nick and for Charlie!  Thanks guys!   

The Importance of Keeping the Noise FLAT

 

A few days ago I put up a blog post about using a noise generator (in my case my cheap FeelTech sig generator) and my TinySA spectrum analyzer to look at the passband of a crystal filter.  I was using the 9 MHz filter used by Dean KK4DAS and the Vienna Wireless Makers Group.  The idea is simple: insert broadband noise into the input. The filter should pass more of the noise that falls within its passband.  The TinySA should let you see this.  At first, I was pleased that I could clearly see the passband.   I thought I had succeeded.  See above. 

But I was bothered by something.  Look at that bump in the passband.  It should be close to flat across the top.  

I decided to take a look at the same filter with my NanoVNA.  Here I was not using a noise generator.  The NanoVNA sweeps the filter using and looks at output in the Log-Mag mode.  Here is what it looked like (below): 

That was much better.  But why the difference?   Tony Fishpool G4WIF suggested that my noise source might not be putting out noise at the same level on all frequencies.  I took at look at the noise output of the FeelTech sig gen in the range of the filter passband (with some above and below frequencies for reference) and I found that the flatness of this noise depended a lot on what frequency I had the sig gen set to.  I tuned it around a bit until I found a setting that produced a flat noise output in the desired frequency range.  Then I went back and swept the filter with the noise and the TinySA again.  Here is what it looked like with the "flat" noise: 

Better,  I think.  Closer to the passband displayed by the NanoVNA.   

Tony points out that these Chinese sig gens don't really put out random noise -- they give us predictable noise.  Dean said "Predictable Noise" would be a good name for a rock group.   I said they could open for my favorite: "The Ceramic Spurs." 

Juliano

 

https://n6qw.blogspot.com/2021/11/a-scratch-built-minimalist-ssb.html

Farhan's Amazing Knack Story: From a Boyhood SW Receiver to the Design of the sBITX SDR

The presentation starts at about the 4 minute point. 

I think if I were only allowed to watch one YouTube video in the next year, I'd make it this one. 

In this amazing RSGB video, Ashhar Farhan VU2ESE takes us back to his earliest days as a radio amateur.  He tells us about his very early desire to build radios, his early projects, and his personal evolution as a designer and builder,  from a simple DC receiver, to the BITX, the Minima, the uBITX and now the hybrid HDR/SDR sBITX.  

There is a lot of  homebrew wisdom and tribal knowledge in this video. And we learn so many hitherto unknown details about the rigs that have become so important to us:  

-- Farhan had the EMRFD book with him on the famous flight from Sweden to India during which the BITX was designed. 

-- We learn about the origins of the BITX oscillator circuits, and that the VFO and BFO are essentially the same.  

-- I was really pleased that Farhan included a picture of my HB BITX17 rig in his presentation. 

-- Farhan discusses the difficulties he faced in obtaining needed parts in India. 

-- We actually see the nylon washers that Farhan used in the original BITX. 

-- Farhan discusses his early system for measuring coil inductance. 

-- In addition the huge contribution of EMRFD,  Farhan talks about how he was helped by Pat Hawker G3VA's writing, and the ARRL's SSB Handbook. 

-- Farhkan talks about his Tex 465 'scope and his building of a Spectrum Analyzer. 

-- We see his evolution to dual conversion. We see the conceptual birth of the Minima and the birth (thanks Wes!) of the TIA amps.  I didn't know about the HF-1.  Then Farhan designed the uBITX and now the sBITX.  

 -- Farhan talks about his practice of taking the pictures of new rigs with the new rig sitting atop the book that was most important in its design and construction.  FB. 

-- I was really blown away by Farhan's presentation of how the uBITX advertisement was inspired by and in many ways based on the Heathkit ad for an HW-101.  Amazing. 

-- I learned a lot from Farhan's discussion of SDR theory.  I pledge to spend more time with this.  I really like Farhan's hybrid HDR/SDR approach. 

-- But I have a question:  Farhan seems to say that we'd need a big expensive GOOGL computer to do the direct sampling HF SDR.  But doesn't the little RTL-SDR do just that?  Without a GOOGL?  

-- Great to see Wes's AFTIA being used in the sBITX.  

-- Really cool that Farhan has his mind on VHF transverters when designing the sBITX.   I liked use of the TCXO module to free up one of the Si5351 clock outputs.   FB.  And great to include an idea from Hans in this rig. 

Thanks very much to Farhan (who stayed up until 3 am to do this!) and to the RSGB for hosting.

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: 

Using Noise to Sweep a Filter with the TinySA

 

I've been meaning to try this for a long time.  Years ago Tony Fishpool and Graham Firth wrote about using a noise generator and a spectrum analyzer to sweep the bandpass of a filter. The idea here is to send very broadband noise into a filter, and then use a spectrum analyzer to see which frequencies make it through.   

I thought about building a noise generator like the one in Tony and Graham's book, but then it occurred to me that probably had one sitting on my bench.  Sure enough, a look at the manual for my cheap FeelTech function generator revealed that PRESETS 3 and 8 are noise generators.   I quickly pulled out a 9 MHz filter that Dean KK4DAS had given me, put the noise into one end and the TinySA on the other end.  Bob was quickly my uncle.  See above.  

More recently Tony G4WIF built a comb generator as a noise source: 

http://www.fishpool.org.uk/combgenerator.htm

Thanks to Tony, Graham, and Dean.  And to the folks who developed the TinySA. 

Why Does Solder Smoke Always Go Right Into Your Face? Now We Know

Because our podcast and blog is called SolderSmoke, I felt compelled to post about this video in which a fellow does some pretty interesting research into how solder smoke actually moves.  We don't often see this much concern about the behavior of our beloved smoke. 

Thanks to Todd K7TFC for alerting us to this.  

I use a small fan to disturb the airflow pattern.