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 1 
 on: Yesterday at 11:18:24 PM 
Started by AJ1G - Last post by AJ1G
Got rid of the sag described above simply by powering the 32 directly from a wall outlet vs a daisy chain pf a light duty 2 wire extension cord plugged into an outlet strip plugged into another light duty extension cord.  Should have gone for the oxygen free copper No. 16 2 wire cords!

Just had a number of QSOs on 40 with it, getting at least 100 watts PEP out, received several good audio comments on it.  Now  need to find a nice early SX-101 to match up with it.

 2 
 on: Yesterday at 09:52:25 PM 
Started by w4bfs - Last post by ka1tdq
I agree.  There's very little SDR software for the Mac.  I have a Mac, but I also have an inexpensive PC that I use for my ham radio stuff, SDR included. 

AND, my plug for the SDRplay.  They run around $150 and it'll be the last receiver you'll ever need.  It's the size of a cigarette pack.  Put the tube receivers on eBay and be done with it.

Jon

 3 
 on: Yesterday at 09:51:17 PM 
Started by KC1AEW - Last post by KC1AEW
Iím a new AMfone member and starting to work my Hallicrafters sx 88. The most severe cosmetic problem with these radios is the sagging bezel as shown in the attached pictures. I been researching options to repair or replace for a while. The original zinc casting can be straightened but there is a (Lost) art to this, which may not work and could result in a lot of busted pieces. Pot metal casting have no ductility and very little strength and can turn into a puddle if overheated - In this case I loose my original pattern bezel. Remaining replacement options are 3D printing, casting or CNC machining from a plate. The problem with 3D printing or CNC machining is the time and expense to develop a correct CAD file of the part and then turning it into an acceptable machine language to make just a few bezels. The larger shops in this area had no interest in wasting their time with this small item - the smaller shop sited a high cost since the first and possibly the second part would require program modifications to make a correct part. The shops all recommended aluminum casting - especially for the small quality (5-10 pieces) I was interested in. I am currently working with a pattern maker and small casting shop to price out a small quantity of castings (the casting pattern to be of hardwood to be good for 50 or so castings). The machining work on the final casting would be limited to drilling holes for mounting screws and dial shafts. The final part would be powder coated with a lightly textured flat black coating to be close to the original. I will cover the cost for all this but am looking for sx88 owners looking for a new bezel to replace their deformed ones. A Little Background: My first step in looking for a replacement was to bring the entire radio into a small CNC capable shop - they said they could make the bezel out of a 1" alum plate for around $200. I then brought the removed bezel in to have one made - do to the complexity of the part they turn the job down. The casting foundry and pattern maker I am working with now are very experienced and have no issues with making the bezel, So here I am looking for any interest so that I can amortize the cost and help out some sx88 owners who need a bezel.
Give me a shout if interested. Thanks, Bob 860-535-0242 (KC1AEW)

 4 
 on: Yesterday at 06:32:32 PM 
Started by k7mdo - Last post by Steve - K4HX
Nice PW rig! And that mod tranny is strapping.

I wonder if a 6BQ5 could replace the two 6AQ5s?

 5 
 on: Yesterday at 06:31:13 PM 
Started by w4bfs - Last post by Steve - K4HX
I've messed with CubicSDR briefly. There are others, depending on the SDR hardware you wish to use. One that looks impressive is SdrDx.

http://fyngyrz.com/?p=915


Others include GqRx

https://sourceforge.net/projects/gqrx/

and SDR# (but I think it might only be tied to Airspy hardware now. It wasn't in the past).

http://airspy.com


That said, there are far more options in the PC realm. As Mac user, I bought a PC to play with the SDR stuff. I hate to say it, but I think you miss out otherwise.

 6 
 on: Yesterday at 03:02:36 PM 
Started by w4bfs - Last post by w4bfs
been touring the web looking for sdr software for mac osx ver 10.x ....I see some specific sw for specific hw but am confused as to what-is-what .... I've been out of the game too long to understand much of the abbreviated language heretofore mentioned .... I would rather not run windows 8 / parallel type of setup ....surely someone has something that is suitable or maybe my ignorance is too profound to get past or be able to understand ....help appreciated ....73 ... John w4bfs

 7 
 on: Yesterday at 02:14:31 PM 
Started by Pete, WA2CWA - Last post by KA3EKH

This is some stuff that I wrote up for Millist and MRCA reflectors and is more centered on Military surplus radios but may be of interest in my account of Dayton.

Ok, the trip is over. Got back around eleven last night after the ten hour drive and started unloading the truck. Wondered in to work this morning and being the kids are working on their finals have the opportunity to jot down a couple things.
I did an informal poll on Saturday and talked with at least a dozen or so people about the fest. People ranging from hard corps Military radio to just regular vendors that were there. I wanted to get a sample of their opinion to mix in with my own being thatís always a hard thing to do. So often before you write or try to say anything you suffer from already having formed an opinion and try to make what youíre writing conform to that thought. But I will try to give what I saw and heard some credence with regards to this yearís event.

Venue:
Harr was located in Trotwood, a suburb of Dayton thatís a depressed semi urban slum. It not in the city but itís nothing like the clean country environment at the Green County Fairgrounds. My hotel is in Fairborn and in the past this involved a half hour drive thru the wastelands that are now the northern bergs of Dayton, closed stores, delict houses and hotels. At least they did tear down all the old Delphi plants and put a casino in that locations but the trip from the hotel to Trotwood was always something like driving thru the outskirts of our older northern cities and at the end of the road was the Hara Arena. An example of what was once fine venue that had fallen on hard times for several years. The Green County Fairground are a fifteen minute drive from Fairborn to the fairgrounds over open farm land and clean Ohio country side to the fairgrounds located just outside Xenia. A world of difference with the only disadvantage being you no longer travel by any fast food establishments and I do miss the morning stops at Tim Hortons for donuts and coffee.
Much has been said about the mud. It did rain Thursday and Friday night and again on Saturday. The infield of the racetrack did turn into a mud pit. People, carts and cars got stuck.  There was much bitching and complaining about how all the personal carts sank and suffered from short battery life in the mud. What do you think is going to happen on a grassy surface when you get lots of rain?  I have had to deal with mud before and sometimes thatís just a fact of life.
The flea market sales aria was smaller than the old site. Maybe as much as twenty percent. But anyone who had been in regular attendance for the last several years can tell you that there were plenty of spaces that never were sold at the old location along with lots of spaces people bought just to park in. I think it was an improvement forcing everyone closer together and eliminating all the empty spaces between vendors. But do think itís a bit confusing having one flea market section in the track infield and another on the bottom side of the tent section by the main buildings.
And it is true that they just had one general entrance for everyone to come in and out of that resulted in long lines and wasted time although there were no significant delays in the mornings when I arrived or the afternoon when we departed.

Ergonomics:
Apart from the mud and signal entrance have to say that there was a huge improvement in the choices and amount of food vendors. But that was at a cost, $2 for a bottle of water or $10 for a burger is a bit much. I did not partake of any of the food vendors myself so cannot comment on the quality although have been told they were good.
Bathrooms in the sections I was in consisted of all port a pots. They clean them out around noon each day and perhaps it would have been better to do this first thing in the morning. Did hear complaints about people going first thing and being upset that they were not clean at that time.  There were plastic trash cans and recycling cans at the ends of most of the rows in the flea market and they were emptied often On Saturday before departing the event had a big box of trash and hauled it over to the nearest trash receptacle and it disappeared. Just a note on trash. I saw people just dump on the ground at their spaces thing like a stack of Motorola Micors and remotes along with lots of other stuff, itís amazing the things people just dump and leave behind.

Economics:
I can only speculate on what I saw and know firsthand. I brought a bunch of Watkins Johnson and Collins stuff that I was selling for a friend. It was all priced to sell, not what many would consider its worth but with the idea of I want this stuff to go away. And with this in mind I sold just about all of it on Friday. This included things like KWM2A transceivers that needed to be restored for $450 each with parts KWM2A transceivers for $250 and Watkins Johnson working radios in the $500 range working and non-working Racalís for around $100 each. Did not sell as much Friday, had a flock of 30L1 amplifiers and ended up selling them all as a package deal because they were not generating any interest at $350 each. Selling at those prices things were moving. I saw items like a working R-388 for just $250 and a 51J-4 for $350 and consider that good deals for those buying. Think both sold, know the R-388 did. There were items like the GRC-19 set for $1,500 that more than likely did not sell but that just proves that at that location and time a T-195/R-392 just wonít bring that amount. I saw a Harris RF-2368 receiver, the military version of the RF-590 for $850 and keeping in mind what they have been selling for I tried to buy it but they would not reduce the price to what I was able to afford so I did not get it. Thatís the thing, if what you have is not selling maybe itís just not worth what people are willing to pay at that time. Other times and places will have different results. Everybody always says about how they can get more on EBay- so let them go and sell it there. Think that my experience has been that everything at Dayton sells for about half to two thirds what it would sell for on EBay and there is no shipping.
As far as the quantity and quality of the sellers, think that just about the same as itís always been. Just speaking for myself have to say that I donít believe in this story on how at one time ďHams would not cheat peopleĒ or ďeveryone was friendlierĒ or all the other old saws we were feed growing up in the hobby. Been doing this for about forty years now and canít say people are any better or worse on the average, but thatís just me. Your experience may differ. There were some complaints about Mendelson not being there this year, I did not notice until I saw some post about it. At one time Mendelson sold lots of useful parts and surplus electronics but I watched them change over the years from a hardware and parts dealer to a huge cluster of tents at Dayton that sold more and more junk like cookware and other unrelated items and did not miss them at all this year.

Conclusions:
Dayton or now Xenia? Is more than just a flea market itís an opportunity to get together with fellow collectors and the mill radio community in general. Itís the opportunity to take part in the 3885 WW2 AM net, the Back Pack Net or my favorite the 51.0 Cold War Net and show off your radios in the field. Not just sit around in you basement or workshop and talk about operating but to get out in the field and operate it. Whatís the point of restoring and working with this stuff if you donít show it off or use it as originally intended? Over thirty Mill radio people took part in each of that days nets. We all had a good time doing it. Also in the process I picked up a frequency counter that I was given and have in the past given away items to other who were like minded. So at the end of the day itís not just a flea market to me. Itís the chance to get together, exchange equipment, operate radios, tell stories and give and get advice and a thousand other things that make the event a success so that will be my prognoses of the event. It was a success and I will be glad to be going again next year.

Ray F/KA3EKH



 8 
 on: Yesterday at 12:17:30 PM 
Started by W1ITT - Last post by W1ITT
Please see my September 25 2016 listing for Collins Gold Dust Twins, reduced to $2500.  One owner, immaculate, a couple boxes of spare tubes, manuals etc.
Norm W1ITT

 9 
 on: Yesterday at 09:05:37 AM 
Started by WB2MJH - Last post by WB2MJH
Johnson Viking Valiant for sale . . Very nice condition , has been stored for seven years in ham shack , worked fine at that time . . Free Johnson invader 200 for parts or repair has good front panel.  . Available for pickup in Upstate New York or Metro New York City area . . .
Price : $600.
Thanks,
Len, WB2MJH. . L.crispix@gmail.com

 10 
 on: Yesterday at 07:22:00 AM 
Started by VE3ELQ - Last post by VE3ELQ
Steve -

I've been toying with the notion of trying something like what you have done but have the same safety concerns expressed by ND8D.  Can you share with us how you went about playing with the circuitry on the "hot" side of the pulse transformer?  Temporary isolation transformer?  Floating scope?  One hand in the pocket? Or what?

Rod
Rod,
My new TX project is intended to run off a 240VAC source wired according to the 2011 electrical code.  It starts at the power company transformer outside as a center tapped secondary. White is the neutral center tap and black and red are the two 120V hot wires running 180 degrees out of phase. The neutral wire is at ground potential and is indeed grounded either at the breaker box or by the power company at the transformer. This can be confirmed with an AC voltmeter from neutral to the extra (for safety purposes) ground wire at the outlet, or the separate station ground, mine reads zero volts. Wiring in older houses prior to the 2011 code change is anyone's guess but probably the same.

Using two 50A rectifier diodes from both hot leads, black and red, feeding the filter cap with the white as ground, full wave 170VDC (depending online voltage), will be seen at the cap. An inrush current protector device and shorting relay should be included to protect the diodes.  That's the plan.  I have NOT yet done this. 

My project is in the final stages of bench testing and not yet in a box. Its currently powered from a 120V isolation transformer fed from a Variac as its prudent to bring things up slowly when testing new designs. I'm currently experimenting with different output transformers, different low pass filter designs, and a higher voltage modulator, and so far its all working FB. The last step will be the power supply as above.  The only stuff in my house using big iron 120V power transformers is my HAM gear and I hope to change that.

73s Nigel


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