gsb-100

I had planned to wait until a few of the current projects were complete, but this Gonset GSB-100 popped up locally and I couldn’t resist. These were produced from 1959 to maybe 1962, so it is contemporary with the early KWM-2. It covers eighty through ten meters; SSB, AM, PM (functionally similar to FM), and CW. It is well designed except for using a TV sweep tube for a final, and for apparently using an inadequate power transformer (these had a high failure rate). This one is dusty, but is in great cosmetic shape and appears to be complete. If the transformer is OK I should be able to bring it back to life. It will be a perfect match with the vintage homebrew amplifier I am refurbishing (using four 811-A’a and mercury vapor rectifiers). Someday I will need to come up with a communications receiver with which to mate it. Gonset didn’t make anything satisfactory so it will probably be a Hallicrafters or Hammerlund from the late fifties or early sixties. Maybe a 75S-1? A 75A-4 would be a better match (though not quite contemporary), being about the same size and also having a rotary drum dial – but the collectors have inflated prices on those far beyond their intrinsic value.

No photos this time, but the observatory should ready to move into again. New roof, new South wall, new drywall (Thanks, Scott at backyardobservatories.com ). Just need to paint the interior and get some gear mounted onto the pier which is still in place. I am not sure what I will install, but it will be lighter than what I have had in there in the past. The days of hauling 70 pound mounts and 50 pound optical tubes up the stairs are over for me, so no more Tak NJPs or 12″ RCs. No more LX-850 and 12″ enhanced SCT.  I have a couple of high quality small refractors available, and a Vixen GP-DX that would carry them with grace and style, so it will probably be something like that. I have a better Canon DSLR (T2i) than the one I used all those years ago (original Rebel) so I think that will do to get me back in action for widefield shots. Might pick up an 8″ SCT for longer focal length work, or the very economical and effective Astrotech 8″ RC.

The setup will be very modest compared to what has been installed in the past, but should be enough to keep me active.

heathtwins

 

The first “serious” station I owned was the Heathkit SB-301/401 combo. I enjoyed contesting in the early 70’s and these, along with a home brew amplifier using a pair of 4-400A’s, did a fine job for me. I also had an Eico 730 modulator connected to the SB-401 finals in a plate modulation scheme so I had real AM capabilities; not a common thing in the 70’s. Many rigs of that era included the AM mode, but it was usually a low level thing, not much more than unbalancing the balanced SSB gemerator. I also had the matching SB-500 two meter transverter, which I used to communicate through AMSAT-Oscar satellites 6 and 7. All in all, I got more use out of the Heathkit twins than any other equipment I ever owned. It is no wonder that I would like to have a set of those twins available again.

I violated one of my own rules in acquiring this particular pair. I don’t mind repairing or refurbishing communications gear but don’t like to get involved in finicky cosmetic re-work so I usually look for gear with no external flaws. The receiver above has had its cabinet painted black at some point. This might have been done to match the blackout SB-200 that was offered one year. Still, the front panel and lettering are excellent and there are no dents. It won’t be very challenging to shoot the cabinet with a close enough color match. If not, I should stumble upon a replacement cabinet sooner or later.

I may actually get an antenna or two up tomorrow. If so, I’ll be busy setting up the FTDX-1200 station and running power, grounds, and coax for a little while. Then I can start getting some of this vintage gear whipped into shape. I have an extra desk with a riser in the office, so I should be able to have the Yeasu, the KWM-2, the S-38C, and the Heathkit twins all set up together at some future date (after everything is working, of course). I suspect there won’t be room there for any more projects. That is OK; this will be enough to keep me busy for a while. I suppose I could set up an alternate station in the upstairs office, as there is an extra desk there as well. I had originally planned to set up the station on that desk; the Yaesu and Kenwood transceivers are on there now – but I think I would enjoy it more downstairs. I can have a much better RF ground there, too.

20160526_174035[1]

 

Dunno how much time I’ll be able to commit to these, so I don’t know when I’ll have results to share. As shared on a previous post, the S-38C is an attempt to reexperience my very first shortwave receiver. The KWM is an attempt to approximate my primary station from the 70’s, which was a Collins S-line (32S-1, 75S-1) from the early 60’s. The KWM-2 was the platform from which Collins derived those. The  S-1 line design and performance were very similar to the KWM-2 which spawned it. The later S-3 series (32S-3, 75S-3) from the late 70’s was a significant upgrade but I never owned those.

I wanted to find an S-1 pair (and may still, some day) but the collectors have really grabbed those up. The KWM-2 is much more available because it was produced in far greater numbers (many were placed into military and commercial service) than the separates (which were marketed only to the ham radio market segment). This should satisfy my desire to experience the S-1 line again, while using up less space and tying up less money. I haven’t yet attempted to date this one, but until I do I’ll call it a 50’s project as this model was introduced in 1959. I admit that it is probably from the 60’s. The model was produced into the 70’s, but a logo change took place somewhere along the line and this one has the earlier badge so it’s not a later unit. Once refurbished, I’ll use it as a backup station until I have an opportunity to swap it for an S-line inj need of attention.

My other 70’s station that I would like to re-create was Heathkit’s later homage to the S-line, the SB301/401 pair. The design, styling, and functional arrangement were very obviously modeled after the early S-line. Mine worked great, but was eventually replaced by an S-1 pair, despite that gear being at least ten years older.  I probably never managed to put as many hours on the S-line as I did on the Heathkit pair, as I owned those during my peak active years. The good news is that these sold like hot cakes and there are plenty of them out there. The prices have remained modest; I won’t have any trouble getting a set of Heathkit twins put together.

All this vintage gear will be fun to have around, but it is already obvious that modern gear has the whole DSP (digital signal processing) thing figured out. As good as the S-line receiver was, and as rosy as my memory of it is, the FTDX-1200 with DSP has  a vastly superior receiver. I have spent lots of time listening on that, using a short random wire on the floor. I am getting closer to getting a real antenna erected so I can hear better and also transmit. Antennas will be modest, as I am now on a very small downtown lot. I have made up a multiwire dipole that should get me on 40 through 10 meters (no WARC) and may get that strung this long weekend. I picked up a trapless vertical antenna for 20 through 6, including WARC bands, but I don’t yet know where I will place it so it may be a while before it goes up. When it does, I’ll be ready for my first-ever WARC band activity. I was never equipped for those bands before.

sb-500

 

Most hams have probably never seen one of these SB-500 two meter transverters. No, I don’t have one (actually, I do have one but it will need to be refurbished), but I did have one back in the day. In the early 70’s the 2 meter ham band was still mostly AM (Johnson and Gonset radios come to mind – and of course the Heatkit lunchbox) but FM was on the rise (usually with converted low band land mobile radios). A few weak-signal fans were using CW. Pretty much nobody was using SSB, though, and when Heathkit introduced the SB-500 it did not create a firestorm of interest. It took in a signal from a ten meter (28MHz) transmitter and heterodyned it up to 2 meters (144 MHz), retaining whatever modulation was present.  Then it transmitted the new signal. Anyone with a ten meter SSB transmitter could rig  one of these to generate a two meter SSB signal. It was a turnkey setup if you had the SB-401 transmitter with which it was designed to mate. Like most, I wasn’t excited about it but approved of the idea in general.

That changed for me when Amsat-Oscar 6 was launched in 1972. This satellite, built by amateur radio enthusiasts, was in a low earth orbit similar to the weather satellites. One of the things it could do was to take in a span of spectrum (100KHz, I think) in the two meter band and translate the whole chunk down to ten meters and retransmit that span, including whatever signals were there. Thus, a whole group of people could be simultaneously using the system and each could be involved in his/her own conversation. That looked like fun! The satellite’s power budget was extremely limited, though. Only efficient modes of operation were permitted. This meant CW or SSB; I was equipped for neither on two meters.

I was using the Heathkit SB-301/401 on HF, though, so the SB-500 was a perfect solution. I managed to pick an SB-500 locally and after some work had it operational. I rigged omnidirectional antennas for the uplink and downlink frequencies and began listening. The satellite had an orbital period of around 110 minutes and an overhead pass lasted maybe 20 minutes. The inclination was such that I could usually hear two consecutive passes (three if the middle one was directly overhead).  I used both CW and SSB and had many enjoyable contacts through Oscar 6.

While Oscar 6 was still operational, Oscar 7 was launched. It had new capabilities but still had the 2 meter/10 meter translator so my setup worked well with both satellites. I had a lot of fun with both. I shut down my “ground station” when I relocated and never got set up for satellite work again but kept up with happenings. Eventually the batteries on Oscar 6 failed so we were down to one satellite. Around 1980 Oscar 7 also went silent due to a battery failure. Nearly 20 years later, someone noticed that it was back up! A shorted battery had put it out of commission but when the battery eventually rotted away it left an open circuit and the solar panels could again power the system. There is no storage, of course, so when the satellite is in Earth’s shadow it shuts down but most of the time it is up and fully operational despite being over 40 years old!

Clearly, I need to rig something to listen for the 10 meter downlink. I suspect that when I have done so, I will get the bug to relive my experiences all those decades ago and actually use it. The good news is that it will be much easier to set up a 2 meter SSB/CW rig these days.

S-38c

 

This arrived recently. Background: the first shortwave receiver I ever owned was a 1952 Hallicrafters S-38C. It was about ten years old at the time (as was I). Dunno what happened to it. Every five or ten years I wonder whether I should try to obtain one for old time’s sake. This time I did. Looks great, but (of course, for $20) doesn’t work. Into the project pile it goes – maybe with a little extra priority. Come to think of it, I think I paid $15 for the first one, and it worked…

The next receiver was a Heathkit GR-64 in 1968 or so. Bad mistake; I haven’t felt any nostalgia for that one. I built it to be the receiver in my first Novice station. It wasn’t a very good performer in that application (though it was better than the S-38). I was seduced by the features and glossy appearance but I soon realized that I should have selected the HR-10 instead for ham use. I don’t think I’ll be looking for a GR-64 to cherish.

When I got my General class I picked up an Eico 753 SSB/CW transceiver. It was better, but not well respected in the ham community. Then a few other transceivers until I got my next separate receiver. This one was designed for amateur use and was loosely modeled after the very highly respected Collins 75-S series receivers. It was a Heathkit SB-301 and worked alongside its companion SB-401 transmitter for several years until both were replaced by the Collins S-line (75S-1, 32S-1) it emulated. I don’t remember what happened to the S line, but that was the last tube receiver or transmitter that I owned. I could easily see me grabbing a set of Heathkit twins or an S-line again just to enjoy having them around.

Automated small-batch brewing appliances have been around for a little while. The first to hit production was probably the Picobrew Zymatic, which makes 2.5 gallon all-grain batches using conventional ingredients and sells for about $2000.  The next to reach production will probably be its little brother, the Picobrew Pico, whose Kickstarter campaign was extremely successful. The first production units, originally predicted for March shipment, should be going out fairly soon. Given that their first Kickstarter project resulted in the Zymatic, a product that has been delivered in decent quantities (well over a thousand),  it seems likely that the Pico will come through. That one is half the price (and half the production quantity) of the Zymatic. It is much smaller, too. The big difference is that, although it is an all-grain system using “normal” ingredients, they can’t be loaded directly into the machine. Ingredient packs must be acquired from the vendor. They have acquired the rights to a fair number of popular craft brews and their in house brewers, who  have created a large library of recipes for the Zymatic, are busily converting those to Pico packs as well. They are also aggressively pursuing independent homebrewers for their recipe development program. It appears the Pico owners will have no trouble obtaining recipe packs that will please them – but this one isn’t going to be nearly as attractive to homebrewers as the Zymatic. They (we) like to use the ingredients we already have on hand (and generally buy in quantity to control costs). It should be a pretty cool item for a non-brewing craft beer drinker, though.

The Brewie is a riskier proposition; it isn’t yet in production and the company can’t point to a previously successful brewing appliance as Picobrew can. Pre-orders are $1600. If successful, it will do 5 gallon batches, and you can use your own ingredients.  I don’t feel very confident about that one.

The next contender’s Kickstarter project just went hot today. The Artbrew will be about the same price as the Pico (though adventurous Kickstarter supporters can snag one for $490). Same capacity as the Pico, too – but with the ability to use your own ingredients. It seems to be one to watch. There’s no history to look at, but the price seems right for what it offers. If successful, it will offer features not available in the Pico, such as internal chilling to fermentation temperatures, as well as maintaining proper temperatures during fermentation. That last bit is important, especially for casual or careless users, as poor management of fermentation temps is a frequent cause of poor homebrews. It is more of a crossover machine, probably directed primarily toward the craft beer crowd yet offering homebrewers the option of using their own recipes and ingredients.

 

picopalecloseup

 

Newsflash: neither of my entries in the AHA national homebrew competition made it to the final round.

It was an extremely mild and pleasant winter here, but also a very busy one. Between relocating the office, Dad’s broken hip, and reverting to a solo practice in which I do everything myself, I haven’t been inspired to write here. There are developments, though.

The brewstand described in the previous post has arrived and is nearly ready for action. The burners amd gas manifold are installed; just have to mount the pilots and thermocouples now. Then I will be able to do normal 5/10 gallon brews in the garage again. Parts one and two of my build article are posted on homebrewtalk.com . Part three will be the final installment after the project is complete.

I have been using a Picobrew Zymatic in the office for indoor 2.5/3.5 gallon all-grain brews. With 15 batches under my belt on that setup, I’m ready to review it when writing time permits. It is a great little system and I plan to use it whenever weather or time don’t permit full, outside brew days.

Current favorite brews: a clone of Pliny the Elder IIPA, a clone of grapefruit sculpin IPA, my house pale ale, my house vanilla porter, and a clone of Yeti RIS. I know, I need to get more of my own recipes into the rotation when time permits – but the clones are so darn good and I only have five taps!

I’m going to make a real effort to post something here biweekly so folks don’t get the impression that it is an abandoned page. I plan to describe a typical Zymatic brewday. I also want to write a little about some new toys, such as the digital refractometer and the pH meter.  Of course, I’ll have to write about the first brewday on the big rig whenever that is complete. I thought I was going to finish building that this weekend, but there’s a lot of paperwork that will need to be done today instead.

 

 

panel2

Got the panel built. I made a few changes from the initally proposed layout, mostly for cosmetic reasons (and, speaking of cosmetics, I WILL be cleaning up some of those rough edges at some point!). I changed to illuminated rocker switches for the pumps and main power to simplify the panel. I changed the chiller output temperature display to a (mostly wasted) PID to reduce panel space usage and to match the PIDs that are actually being used as PIDs. The panel is reasonably uncluttered and should look OK once the lettering arrives and is applied. The bottom panel is a little busier than I had in mind but all of the inputs and outputs are required so it is what it is.

 

Here’s the front of the panel with a legend of device functions:

panel1 with legend

Now the holdup is the new stand. I expected it weeks ago but haven’t yet received a firm shipping date (just a series of “next week” predictions).

layout testlayout test WITH FUNCTIONS

Phase one is the construction of this control panel to operate the three burners, heat exchanger, and two pumps that will be installed. Three Mypin PID modules will operate the burners via Honeywell solenoid valves. The Inkbird at the bottom is being used only as a display device. I plan to have the panel cut, the devices mounted, and the wiring completed over the next two weekends

 

Note: I see that I set up the new URL as a redirect so the browser still displays the old blog name. I’ll switch it to a mirror so it shows the new domain name when I’m in a really good mood and time permits.