2018 ~ Year of Transceivers:
3/15/2018 ~ Recovery!
I am happy to report that most systems have been recovered from my computer disaster --not all to what I am used to with the old system. Here is an example: Formerly I used Windows Movie Maker to create videos for you tube. Surprise! Windows Movie Maker is no longer supported for Windows 10 and you are cautioned to not down load "Movie Maker" form 3rd party Internet sites as most contain malware and spyware.
Windows 10 you are told can do the Movie Maker thing with an internal app called Photo. Well after investing about 1/2 hour I was able to not upload the new video but instead a single non-flattering photo of myself. Yes Donald Trump is better looking. This is real crap!
I was not able to get aol.mail to show up directly in my email. But when you have the "knack" you do the Dilbert thing -- I found that with the aol.mail you can forward the mail to "of course" a microshaft outlook mail account. So I now can see my primary email but must respond using the outlook account.
The really huge issue was my Dreamweaver MX2004 software which no longer can be purchased but must be rented. Well again having the knack and thinking ahead. When I first got Dreamweaver I loaded it on an old laptop (Windows XP Pro) as a failsafe. I dug out the laptop and got it working -- I now can upload to the radio websites and so that is good news although cumbersome in having to use two computers --but better than spending $20 a month to rent software.There is one short coming using the laptop -- it I so old that it doesn't recognize photos on my Android phone. So I now have to down load the photos to my new computer and save them as jpegs and then using a flash drive move them over to the laptop --again a small inconvenience but no rental fees or additional software purchases.
The other good news I now have Arduino 1.8.5 working with my old sketches made in 1.0.5. The ones recycled use the color TFT --I suspect I will have problems with the LCD sketches but haven't tried that as yet. In a prior post I mentioned one Arduino sketch not archived in late February was the rework of the Big Kahuna. I was able to recreate that sketch (about 2 hours) and you can see that below. If you scroll down to the prior posting you can see that we are close to what was originally done -- the biggie its still works on the air!
I did have to purchase Office 365 but did get a bonus of having Publisher included so that is a another way to build websites. With Power Point I now can create schematic diagrams and write articles using Word. At the end of one year everything dies and you have to spend another $70. But you do get yearly updates on all of the software. I did an evaluation of the cost of Office 2016 and thought initially this was less out of pocket today.
My thoughts are now turning to an even bigger monitor than my 20 inch. A 27 inch would really make this "new rig" really shine!
Hopefully we'll be getting back to hardware building in short order.
3/11/2018 Had a Major Setback!
Losing your "main computer" to a catastrophic event is like watching your Apache Anan 200, ICOM 7610 or maybe your FLEX 6700 go completely up in smoke. I used these model numbers since so many hams have shifted to high priced appliance rigs and thus not many homebrew rigs catch fire and burn. So OK for my description -- it is for impact. You simply don't want that to happen!
Now about two weeks ago I thought about such an event given there were some strange sounds coming from my 5 year old machine. Taking this as a message from the Radio Gods I used my 1 TB external hard drive and copied most things on to the external drive. So literally 99% of my precious radio files exist still today. The small percentage that were not can be replaced. So a word to the wise --back up your files. The one file I need to recreate that was not saved was the new display format on the Big Kahuna.It was done the day before the unfortunate event.
There was a bit of a trick to get this to work as there are two toggles switches on the front panel. One switch controls the band and thus you can select either 20 or 40 Meters with the switch. Actually in the code are five selections --so you can have any two band combinations. Thus you could have 80 or 15 Meters. or 40 and 10 Meters --you get the idea.
The other switch controls the selection of USB or LSB. Formerly I had the letters SB that was loaded during set up and then that switch changed the first letter to an L or a U. where that selection was made in the loop part of the sketch. Well because it is in the loop the L or U seemed to flicker on the screen based upon going through the loop. My solution for that annoying flickering was to load USB and LSB during the set up and then the small black square next to those words moves up or down to show which mode is active. The screen shows we are in 40 Meters. It took me about two hours to do this not so much about the code as it was putting the data on the screen so that it would look OK visually.
The rectangular black square in the middle of the screen has the Word TUNE appear there when the rig is put into tune. That operation also generates a pulsed 988 Hz tone for ten seconds which facilitates tune up. Can't understand why the uBitx crowd is using hardware to generate the tone for CW. One day some brilliant uBitx illuminati will proclaim he discovered a new functionality --I have been doing this for three years.
So the recovery is in motion, but there are some terrible issues that are still in play:
- I still have not been able to read my main email account in Windows 10. I can do it on the Internet but not my computer --it is some sort of synchronization problem and also assigning ports to deal with aol.mail. I have done all the steps but am looking at no email on my computer for that account.
- Software today is an issue that was bought long ago. I have Office 2013 which now requires me to buy Office 2016 --now that is crap. Office 2016 is about $125.
- My Dreamweaver 2004 MX can't be loaded on this machine so I have no way of updating my websites unless I convert to another web publishing software. If you buy the new version of Dreamweaver, it is $250 or now the popular fad is paying a $20/month subscription fee. Even Go Daddy wants to charge you for web publishing software and two years is about $125. I have six websites with them --you think I'd get a discount. That sadly will mean no website updates as that is in line behind getting Office 2016.
- Windows 10 is nice but actually too many choices -- the screen gets filled up with a lot of crap I don't need.
- I saved all of the precious Arduino files and the libraries. But most of my prior work was done in IDE 1.0.5 as most of the current crop of libraries work directly with the version. Of particular concern are the libraries for Liquid Crystal Displays --most work with IDE 1.0.5 most do not with IDE 1.8.5. The stuff I did with the teensy 3.6/3.6 needs a download from PJRC and I think that has some issues with 1.8.5. So now if I want to go back and make upgrades to older rigs much like I did with the Big Kahuna, there are likely many hours of hand hockeying to get everything to work. The process of getting everything to work with IDE 1.8.5 will be a challenge. Much like the challenge of trying to have sex with a 400 pound woman in the back of a 1966 VW Beetle Possible but not without a lot of difficulty.
- Uploads to you tube and connections to NETFLIX are still on the list.
- And on and on. Word to the wise get a Back UP hard drive and never let your computer die. 73's Pete N6QW
I am using my new Dell Computer for the Blog.
- The Good news --it is really fast!
- The Bad News -- I still type with 2 fingers!
Turn on your speakers or connect your headphones for a musical tour of some of the radio projects from N6QW. Yes you have to have the "Knack", the tools and the parts to build these rigs. It also helps to have simulation software and an EE Degree.
Pete N6QW 3/9/2018
"Toobs can be used in Ham Transceivers!"
If you are 45 years old (which means you were born after 1972) you probably missed having a rig with glowing tubes sitting three inches from your nose. By 1972 solid state rigs were on the shelves of your local radio emporium and even some were soon to be fully all solid state. By the time you were 10 years old, there were few radios being sold that had vacuum tubes. You missed it.
But for some of us old timers we grew up with tube rigs. In 1959 I went to Pittsburgh to take my General Class Test (no VE's or send in box tops in those days) and after learning I passed, my first stop was at Cameradio in downtown Pittsburgh-- a Collins distributor. For the longest time I looked at a KWM-2 that had a price tag of $1250 without the power supply. To myself I said "someday". The KWM-1 the predecessor of the KWM-2 was rumored to have been installed in Gary Powers U2 Spy Plane that was shot down by the Ruskies. Single sideband had revolutionized our communications medium
In 1962 I spotted the rig below which was made by Swan Engineering and installed in a Sunbeam Alpine. Wow it was a single band SSB transceiver capable of working the world right from your car.
The Swan rigs were initially made in Benson, Arizona and later the manufacturing shifted to Oceanside, CA. Three models were offered: the SW-175, SW-140 and the SW-120 which were intended for operation on a single band. A later model the SW-240 was a tri-bander. The original lot were all hand made by Herb Johnson W6QKI (SK) in his garage. If you happen to have one with a gold face -- it is a rare one and likely from the first or second build.
I have owned literally dozens of these and still own one of the early units that was actually made in Benson, AZ. Unfortunately it is not a gold face.
Note this model does not have the meter case face over the frequency window and the panel meter is a really expensive Triplett. Note that the silk screening is kind of "crude" and not centered on the frequency window or other controls. The later unit says Swan-120 and my unit says SW-120 and Swan Engineering Co. The back panel on the above rig states it was made in Benson Arizona. But some 60 years later it still works and still puts out a nice signal.
Several Crystal Filter frequencies were used, with some at 5.5 MHz while others at 5.773 Mhz. It all must have been based on what was available. Internally there were many tube changes and it can drive you nuts. An example, some units use two 12BA6's while other used two 6BA6's -- in one case the filaments were in parallel while in the other the two tubes were in series. One version used a 12AV6 wired up as a tone oscillator while other variants just unbalanced the carrier for tune up.
Nonetheless many units were sold world wide and some are still on the air today.
In 1977 I made a decision to scratch build a Swan-120. Only this time I was opting for making it more compact in size. There were to be three modules: a mainboard, a VFO Module and a driver / final amp module. I built it and the results were less than sterling. One problem was the final amplifier would not be tamed. In disgust I removed all of the parts from the mainboard and just kept the metal chassis plate that was approximately 4.5 X 6 inches. A couple of months ago while looking in a box of old parts I found the chassis plate, which is shown below.
Mind you the size is 4.5 X 6 inches. About a month ago an event occurred that caused me to think about rebuilding that 1977 rig -- with some changes.
The current plan is to rebuild most of the mainboard but to use a solid state audio amp for the output and instead of the tube driver and final to use all solid state devices for about 30 watts output on 40Meters. For the frequency control and BFO frequencies -- yes an Arduino + Si5351. The IF will be at 9.0 MHz using the GQRP Club filter.
Here was the first step and that was to cut some new holes in the chassis plate. Wow there ain't much metal left. I used tube shields on most of the tubes as that will help with the heat dissipation.
|The new mainboard with parts installed|
|First Part Installations|
One critical item was the Balanced Modulator transformer which was built from parts from a defunct Drake TR-4 transceiver Balanced Modulator.
Drake's original assembly consisted of a diode ring and two coils. The hardest part of the modification was making the adapter plate (piece of scrap PC Board) to mount the transformer to the chassis. Guys, bragging here, it was done on my manual mill and took all of about 5 minutes, The larger opening is about 3/4 inch square and the two slots were milled out using a 1/16 inch end mill. The Drake enclosure has a forked spring type piece of metal on either end. When fitted into the slot it expands and a couple of tangs on the assembly spring load the fit so once installed it doesn't move.
The modification of the transformer consisted of removing the four diodes and rewiring the two windings to five of the six pins. The Swan transformer had a primary winding that connected at either end to the plates on the 7360. Across this winding were two capacitors in series and the series connection was to ground. Effectively the two series caps make the total capacitance across the transformer the product over the sum of the two. Using my AADE LC meter I measured the inductance of that plate winding and found it to be 35 uHy. Now it is a slug tuned core --so any stray capacitance can be touched up with the slug. Since the BFO is at 9 MHz the capacitance across the winding = 10 PF. Thus two 20 PF caps in series will do the job. NOW I had to do this twice --so keep this in mind --luckily I caught this before applying power. I went into my capacitance storage bin and plunked out two 20 PF caps and installed them across the core and bringing the common connection to one of the pins.
At 3:00 AM my brain awoke me and said "You dummy" those caps have a voltage rating of 50 VDC. Connecting them to the plates of the 7360 that will have 185 VDC supplied to them will blow them up! We are working with Toobs guys think about higher voltages ratings of components!!!!!
With a good deal of arrogance my tribal knowledge is showing as I have built about a half a dozen tube type SSB transceivers and by and large the current technology solid state IC based transceivers are far easier to implement. I have also built some hybrid rigs where the VFO is all solid state and the rest tubes. This one below is basically a Swan 120 with EL84 tubes in the output for a whopping 20 watts PEP on 20 Meters. I started building this the day I retired in 1997 and it took about a month. The IF is at 9 MHz and used a KVG XF-9B filter. You had to have the knack to build this rig!
Something different than the SW-120 -- the meter reads Cathode Current and was an S Meter as well. Yes this was only possible because of my extensive junk box and having many years of tribal knowledge. Not many hams today can build rigs like this -- but those reading this blog actually could. But first you must start by saying Yes I Can!