Solar Cycle 25 -- The High Frequency Oracle Has Spoken (THFOHS!)

Not quite as authoritative as a spoken message from the The Radio Gods themselves (as in TRGHS), but the HF Oracle seems to be well connected.   Time to start planning for Moxons and Hex Beams!  

Read the full poetic report from the Oracle here: 

https://forums.qrz.com/index.php?threads/the-hf-oracle-prognostication-for-solar-cycle-25.626433/

National Dial and Gearbox Problem Resolved

Thanks to all who offered advice and assistance.  With help from you guys -- and  especially from Pete Juliano N6QW -- I think I have this fixed.

Pete was right -- the problem was really with the variable capacitor.  The one I was using was kind of stiff and irregular in its motion.  I found another one in the junk box that was easier to turn (it has one set of ball bearings).  This fixed most of the problem.

I also spent more time making sure the shaft of the cap lined up perfectly with the shaft of the gear box.  This also helped a lot.

I realize now that some of the "stickiness" that I occasionally feel while tuning may be coming from the dial -- not from the gear box.  It looks like my dial took a hit that slightly bent one portion of it.  It seems that the numbers have a bit of trouble clicking over on that portion of the dial. Some lubricant may help there.  But I can live with it.

The receiver now tunes very smoothly and I can go right back to a frequency and find the signal exactly where I left it.  There does seem to be a very slight difference depending on whether I "approach from above" or "approach from below" -- but this is not a big deal.

Check out the pictures of the receiver and the VFO.  Note the "cardboard from a coat hanger" coil form.  The winding is held in place with nail polish varnish.  I had planned on having the variable cap, the coil , and the associated fixed caps all in a box for better thermal stability, but the VFO is very stable even without the box.  I have the VFO running 455 kc ABOVE the signal frequency.  It runs from about 7455 kc to about 7800 kc.  I could have set it up to run 455 kc BELOW the signal freq.   That would have made it a bit more stable (it is easier to attain VFO stability at lower frequencies) but VFO is so stable that I probably won't mess with it. I followed DeMaw's rules:  Physical stability, NP0 caps.  For the NP0 caps, put several of them in parallel to get the desired capacitance value. Keep heat-producing active components away from the coils and caps.   

Thanks again to Armand WA1UQO for giving me this amazing piece of radio history. And thanks to Tim Sutton for the big box that holds this receiver. 

James Millen knew what he was doing.  See: http://www.isquare.com/millen/millen-page.htm

M0KOV's Real Life Dilbert Moment -- His Mom Took Him to the Doctor

M0KOV's BITX

Dilbert's mother took him to the doctor because of ham radio.  Jean Shepherd's date said that Shep's mother should "take him to a doctor" (he was obsessing over his Heising modulator.)  And now we learn that Steve M0KOV was hauled into the doctor's office because of his "obsession with electronics."  You are in good company Steve.  The Knack diagnosis is confirmed. 

From Steve M0KOV: 

Just watched young Dilbert at the doctor's surgery.

Although I was late getting my ham licence, I'm sure that I fit the standard knack victim mould. I built my first radio at the age of 10 and even before then I preferred to be bought batteries, switches and lamps rather than sweets. Within a couple of years my small bedroom comprised of a bed, somewhere to throw my clothes and an electronics work bench. The bench and  floor were completely covered with half built electronic projects, ex military radios, tools, my beloved old Heathkit oscilloscope and the rest. 

Now, my true Dilbert moment. I remember being in the family doctors surgery and my mother was discussing my inability to get to sleep (a perfectly normal ailment for a 13 year old male). She was voicing her concern that it might be my obsession with electronics,  and it was all going round in my head and keeping me awake. Funny, later in my life she never seemed to be bothered if the worry of studying or exams kept me awake.

Thanks for another great podcast.

73 de Steve M0KOV

SolderSmoke Podcast #209 SKN, Old Rigs, Movie Review, Safety Tips, Mail Bag

SolderSmoke Podcast #209 is Available: 

13 January 2019

http://soldersmoke.com/soldersmoke209.mp3

An HT-37 "With Presence!"  Even on CW!  A Straight Key Night Story
Saving a much-loved HT-37 
Drake 2-B Alignment
Tweaking the Mate for the Mighty Midget
Fixing a Deaf DC Receiver
A Wobbly National HRO-ish Gear Box 
Minimum Discernible Signal Tests
Pete's Festive Holiday Transceiver in a Bottle

Movie Review:  "First Man"  Neil Armstrong goes to the moon. 

Safety Tips for 2019:  Fuses, Hard Drives, Flu Shots. 

MAILBAG: 
Dave G6AJW builds Pete's Sudden Transceiver
Rogier KJ6ETL builds a new shack
Steve N8NM Helps save the HT-37
Jim AL7RV W8NSA builds Parasets
Dave AA7EE puts a beacon on the air -- Please Listen! 
Jan OM2ATC builds and documents an Si5351 VFO
Bruce KC1FSZ Homebrew's a BITX
KB1GMX's Tip on IRF-510 Oscillation Prevention
Ryan W7RLF Homebrews a DC Receiver

Listening to August K5HCT from the East and West Coasts on 40
Tim WA1HLR rebuilding his 1968 transmitter.  

Old Station On-The-Air -- A Transmitter Half as Old as Radio Itself

I'm biased, but I think it is "a thing of beauty."   With some unexpected free time available, today I followed up on my HT-37 work by cleaning and aligning the Drake 2B.  I was assisted in this by one of the many great YouTube videos by Alan Wolke W2AEW.   

The Drake 2B's 50 kc and 405 kc oscillators were right were they were supposed to be -- no adjustment required.  And I don't think they have been peaked since 1973.  The 455 kc IF can was also very close to perfectly tuned. 

Since most stations from the mid-1960s had some QSL cards on the wall behind the rig, I pulled out some old ones and put them up.  Many of these contacts were made by the rigs in the picture. 

If we say that 1897 marked the first use of radio, and if we assume that this HT-37 was manufactured in 1959,  that means that my old transmitter has been in operation for almost HALF of the history of radio.