Part of one row of the outside area -- less than a tenth of the total. There's no place to get a really good overview photograph but take it from me, the Hamvention is
huge!One commercial vendor offered miniature straight keys, J-38ish (the general Bunnell "Triumph" pattern, widely used in the U.S.) but about 3/8 full size. I wanted one...but didn't buy one on sight and, of course, could not find them again.
But that was all I missed at Dayton. I didn't buy anything large, but several smaller items came home with me along with plenty of photographs.
Above, the
Morse Telegraph Club, with a bit of the
Vibroplex booth in the background. (I bought a couple of "Vari-Speed" attachments from Vibroplex, a nice pre-WW II invention the company brought back several years ago. The new owner and staff were there, with the full line of keys.)
Begali!
Peitro Begali is at the right, perhaps the best key designer alive (apologies to
Mike Marsh, who does beautiful work) and certainly the most prolific; he demonstrated his Swedish-style straight key and let me give it a try. That blurry photo was the best I could get. The Begali booth is solidly busy all the time and a clear photo is all but impossible.
Speaking of keys, that's the ballcap and one ear of Mr. Enigma (the WW II encryption device) and Mr. Keys himself, Professor
Tom Perera, W1TP, and above him, a huge and
very wondrous strange key, with two sets of contacts and adjustments galore.
More keys. Readers of this blog will recognize the bugs, and perhaps the unusual Western Electric straight key at the top center, but how about the gadgets over at the right? They're "registers," with clockwork pulling a paper tape under a stylus that "writes" the incoming code as long or short lines. This technology preceded transcribing code by sound; it never occurred to Morse or Vail that anyone could manage that....until operators started doing it. The machines shown are roughly Civil War vintage.
Here's a beauty! A Collins 20V3 AM broadcast transmitter, 1 kW with cutback to as low as 250 Watts. Once a stalwart of local "coffeepot" AMs, most surviving examples are either relegated to backup transmitter service or, like this one, have been converted to ham use. You can see two of the tubes glowing at the left; there's another pair at the right: 2 RF finals, 2 modulators. Originally, 2 or 4 mercury-vapor rectifiers would have been glowing a happy purple-blue at the bottom of the window. This rig was up on the bed of a small truck but it's odds-on the 866s have been replaced by solid-state diodes; most people don't enjoy the failure mode of M-V rectifiers, or the half-hour-plus warm-up time if you don't keep them cooking all the time. This rig offers a surprise for the unwary: there's 110 VDC on the RF output! It operates a relay that shuts the transmitter off if there's an arc, and will give you quite a jolt if you don't know about it. (BT, DT.)
Another, even bigger transmitter, though I think it was a kiloWatt job, too. Originally it was a nice sober Gates gray. I was unable to capture the full glory of this repaint, complete with a yellow "tube guy," lightning bolts and floating eyeballs. Why? Why not! (Anything that keeps this old iron around and on the air is okay with me. Perhaps that's barbaric, but they are going to landfills in droves.)
Not every transmitter requires its own truck. This is a "1929 type" high-C rig probably built in the 1980s. It's a directly-coupled high-power oscillator. ("High power" being some tens of Watts, with luck.) Some hams run these on the air -- properly set up, they work fine, despite a tendency to "yoop" mildly as the antenna sways in the breeze.
Receivers! (One of those things is not like the others, and I don't mean the "doghouse" power supply for the HRO-7, second from left. Can you ID the odd box out?)
Hallicrafters, in fair shape.
National, a WW II set, ditto.
RCA, I think. In rough shape; you can't see the clock-type tuning scale, with "hour" and "minute" hand for reading down to the kilocycle. Or so.
RME 69, with the hard-to-find preselector. I wanted to buy this one; it's in decent shape, unrestored, and the price was right. But it would need weeks of work and I am full up for projects. Note the absence of labels for the controls -- designer E. G. Shalkhauser, W9CI, was of the opinion anyone who would be operating the receiver should either be smart enough to figure them out or sufficiently interested to read the manual.
RME made some of the best receivers of their day; after WW II, they built a few more models and were bought up by Electro-Voice. E-V eventually sold the name but it is tempting to wonder if some of the "DNA" remained: long after RME was gone, some retired E-V engineers started up a little ham radio company called
Ten-Tec. They've done all right.
This came home with me. Made right here in Indy, the EZ-TOON aftermarket vernier tuning knob! A 1920s aftermarket accessory for receivers.
Found two of them. Here's the user's side.
Among my purchases: a couple of books from the RSGB, the previously-mentioned Varispeeds (and a contact burnisher: I nearly lost a QSO two days ago thanks to dirty key contacts!), a pair of 6BG6 tubes, a kind of an octal 807 beam power tube, some round "Ohmite" type knobs, an NOS Hammarlund plug-in coil form in the original box, ceramic standoff insulators and a National variable condenser.
And that's a glimpse of my day at the Hamvention. I'm thinking about driving back Sunday -- need to top up the oil in my car, first.
Visitors walk down a narrow aisle between transmitters and the test bench before coming to the row of operating positions. Left:
Center:
Right:
Ship's radio rooms are a pretty fair match for the ideal ham shack, too, though I don't suppose very many of the guys copy traffic on a "mill" these days. (And I wonder if there might not be a few southpaws on the crew -- or did the Navy train ops to send left-handed?)
The big transmitters are right there where you can get a good look.
The TBS low VHF transmitter-receiver they've been getting into operating condition is kept far enough away to keep curious fingers safe. You can just see the side of it in the right-side image of the operating positions -- the acronym for this is sometimes (and unofficially) translated "Talk Between Ships" and sure enough, my Dad's 1946 Introduction to Radio Equipment, NAVPERS 10172* says it was "designed to provide short-range communications between surface craft such as task forces or convoys." Interestingly, the book covers operation of just about every receiver and transmitter in the USS Indianapolis Radio Room exhibit.
The more modern ham gear is kept out of sight when not in use, but pipe that shiny green SP-600! I'll be back -- the museum is not very far from where I work and they tell me volunteers are present many mornings and all day most Thursdays.
Part of one row of the outside area -- less than a tenth of the total. There's no place to get a really good overview photograph but take it from me, the Hamvention is huge!
Above, the Morse Telegraph Club, with a bit of the Vibroplex booth in the background. (I bought a couple of "Vari-Speed" attachments from Vibroplex, a nice pre-WW II invention the company brought back several years ago. The new owner and staff were there, with the full line of keys.)
Begali! Peitro Begali is at the right, perhaps the best key designer alive (apologies to Mike Marsh, who does beautiful work) and certainly the most prolific; he demonstrated his Swedish-style straight key and let me give it a try. That blurry photo was the best I could get. The Begali booth is solidly busy all the time and a clear photo is all but impossible.
Speaking of keys, that's the ballcap and one ear of Mr. Enigma (the WW II encryption device) and Mr. Keys himself, Professor Tom Perera, W1TP, and above him, a huge and very wondrous strange key, with two sets of contacts and adjustments galore.
More keys. Readers of this blog will recognize the bugs, and perhaps the unusual Western Electric straight key at the top center, but how about the gadgets over at the right? They're "registers," with clockwork pulling a paper tape under a stylus that "writes" the incoming code as long or short lines. This technology preceded transcribing code by sound; it never occurred to Morse or Vail that anyone could manage that....until operators started doing it. The machines shown are roughly Civil War vintage.
Here's a beauty! A Collins 20V3 AM broadcast transmitter, 1 kW with cutback to as low as 250 Watts. Once a stalwart of local "coffeepot" AMs, most surviving examples are either relegated to backup transmitter service or, like this one, have been converted to ham use. You can see two of the tubes glowing at the left; there's another pair at the right: 2 RF finals, 2 modulators. Originally, 2 or 4 mercury-vapor rectifiers would have been glowing a happy purple-blue at the bottom of the window. This rig was up on the bed of a small truck but it's odds-on the 866s have been replaced by solid-state diodes; most people don't enjoy the failure mode of M-V rectifiers, or the half-hour-plus warm-up time if you don't keep them cooking all the time. This rig offers a surprise for the unwary: there's 110 VDC on the RF output! It operates a relay that shuts the transmitter off if there's an arc, and will give you quite a jolt if you don't know about it. (BT, DT.)
Another, even bigger transmitter, though I think it was a kiloWatt job, too. Originally it was a nice sober Gates gray. I was unable to capture the full glory of this repaint, complete with a yellow "tube guy," lightning bolts and floating eyeballs. Why? Why not! (Anything that keeps this old iron around and on the air is okay with me. Perhaps that's barbaric, but they are going to landfills in droves.)
Not every transmitter requires its own truck. This is a "1929 type" high-C rig probably built in the 1980s. It's a directly-coupled high-power oscillator. ("High power" being some tens of Watts, with luck.) Some hams run these on the air -- properly set up, they work fine, despite a tendency to "yoop" mildly as the antenna sways in the breeze.
Receivers! (One of those things is not like the others, and I don't mean the "doghouse" power supply for the HRO-7, second from left. Can you ID the odd box out?)
Hallicrafters, in fair shape.
National, a WW II set, ditto.
RCA, I think. In rough shape; you can't see the clock-type tuning scale, with "hour" and "minute" hand for reading down to the kilocycle. Or so.
RME 69, with the hard-to-find preselector. I wanted to buy this one; it's in decent shape, unrestored, and the price was right. But it would need weeks of work and I am full up for projects. Note the absence of labels for the controls -- designer E. G. Shalkhauser, W9CI, was of the opinion anyone who would be operating the receiver should either be smart enough to figure them out or sufficiently interested to read the manual. RME made some of the best receivers of their day; after WW II, they built a few more models and were bought up by Electro-Voice. E-V eventually sold the name but it is tempting to wonder if some of the "DNA" remained: long after RME was gone, some retired E-V engineers started up a little ham radio company called Ten-Tec. They've done all right.
This came home with me. Made right here in Indy, the EZ-TOON aftermarket vernier tuning knob! A 1920s aftermarket accessory for receivers.
Found two of them. Here's the user's side.
I had to build the chassis. It's just galvanized sheet metal -- aluminum might look nicer. Top view with the lid off -- band selection by plug-in coils! I didn't have any simple-type grid-cap clips but the little brass coil spring works okay:
From below, you can see my efforts to "fine tune" the regeneration control with paralleled resistors. The original used a carbon-compression rheostat, an early multi-turn variable resistance, but I had to come up with a coarse setting:
Multiwire cable out the back to the batteries -- 3V "A" and a 45V, tapped at 22.5V "B." The detector is a type '32 screen-grid tube with two stages of audio from the '19 dual-triode in the back compartment.
