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Re: 2n2xx Transceiver
I would be interested in maybe 2 boards. Gotta have something to keep me
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out of trouble during the winter. Art N4EZZ <n4ezz@...> GnuPG key ID 0x6712DD0E ============================= "Whenever a man has cast a longing eye on offices, a rottenness begins in his conduct." Thomas Jefferson On 11/9/19 12:08 PM, Leland L. Bahr wrote:
A long time ago, NORCAL offered a transceiver kit designed by Jim |
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Re: Group Introduction: If you're going to post on the group, reply here!
¿ªÔÆÌåÓýMike K5ESS ? From: [email protected] [mailto:[email protected]] On Behalf Of Ryan Flowers ? Hello everyone, -- https://miscdotgeek.com |
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Re: 2n2xx Transceiver
I will start the ball rolling. :)
I would like 3 pcb's for sure. Rev. O. Alan Jones, N8WQ On Sat, 09 Nov 2019 14:08:57 -0500, Leland L. Bahr <w5drc@...> wrote: A long time ago, NORCAL offered a transceiver kit designed by Jim Kortge, K8IQY. It was called a2N2XX as it could be built on 20, 30, or 40 meters. It was unique as it used a lot of 2N2222 transistors and did not use any IC chips. It worked extremely well. There was a reflector set up for this radio, [email protected] It has 73 members and is a pretty quit reflector these days. But, a few days ago one member popped up and asked about getting a PC board for the project. K8IQY popped up and said MAYBE.<SNIP>
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2n2xx Transceiver
A long time ago, NORCAL offered a transceiver kit designed by Jim Kortge, K8IQY.? It was called a2N2XX? as it could be built on 20, 30, or 40 meters.? It was unique as it used a lot of 2N2222 transistors and did not use any IC chips.? It worked extremely well.? There was a reflector set up for this radio, [email protected]?? It has 73 members and is a pretty quit reflector these days.? But, a few days ago one member popped up and asked about getting a PC board for the project.? K8IQY popped up and said MAYBE.? That got me going and I sent out a few e-mails to the group as I was very excited to think a board may indeed become available for the project from Jim.? But to my dismay only a couple others showed interest.? (Maybe the members of that group all have one and are not interested in building another one.)? I love to build so maybe I am alone.? I bring it up here because maybe the members of this group would be interested in building an all transistor mainly made up of 2N2222 transistors transceiver. As I said, Jim Kortge, the designer said he would consider a PC board run, but I am sure he would not want to do it for just a couple guys.? You can read up on this NORCAL kit at: Maybe there is some interest in this project on this reflector.? I also think being an all transistor radio, it lends itself well for learning how to trouble shoot a radio.? (Sorry for the long post.)
Below are a couple messages I had sent to the 2n2xx group: Jim and others, Keeping your Gerber Files private sure makes sense to me, Jim. If you don't there will be a Chinese knock off for sale shortly thereafter.? As I mentioned in my prior post, the crystals and final output transistor also need to be addressed as the originals would be difficult to find.? You being a great designer maybe could come up with an good cheap alternative transistor for the same PC board or just alter it slightly for another approved transistor.? Maybe someone else could jump in and provide a set of crystals for each band or have a group of three guys each supplying the crystals for one of the three suggested bands. Using readily available surplus crystals would cut down expenses. I see lots of surplus crystals at 4,6,8,4.194304, 4.032, 4.096, 7.2, and 11.0592 Mhz.? ( Checking, I see Mouser has 4.9152 mhz crystals for 40 cents ea, 7.3728 Mhz crystals for 40 cents each, and 11.000 Mhz crystals for 40-50 cents each plus 11.046 Mhz crystals for 40 cents each.?? These are all very close to the original 2N2XX crystal frequencies.) ? A build list of parts from Digi-key or from Mouser would also be a big plus as been suggested. ? If all this were done, they would go a long way in resurrecting the 2N2XX radio.? I'd even maybe be willing to help be a supplier of the matched crystal sets for the project if this would help move the project forward.? I don't know about others, but I'm 81 and don't get on the air much anymore.? But I still like to build QRP rigs.? I've got many 2N2222 transistors around here ready to be used!?? Being a marketing guy, this project needs to be mentioned on other reflectors if it indeed will happen.? All in all, I don't think the workload would be insurmountable and if these extra details were addressed, the project would be in much larger demand.? Everything else is easily obtained.? A memory keyer could easily be added from a number of suppliers and a case made from PC board material or even made from a 3D printer could be developed. Lee, w0vt, w5drc The original 2n2XX used a 2SC5739 output transistor, no longer readily available.? I see w8diz used a pair of 2SC5706 transistors in his latest design.? They together produce 5 watts plus.? (KB5JO has a 20 meter DIZ kit and it puts out around 7 watts on 20 meters with a pair of 2SC5706 transistors in his radio.)? DIZ also uses this transistor in his driver stage.? Mouser has them for 40 to 60 cents each based on quantity purchased.? Yes, you would need two of them, but they work well and are super cheap from a reputable supplier.? Not fake Chinese transistors.? According to DIZ, they even work up to 17 Meters with slightly less power output in his 17 meter version.? So they would be good in a 40,30, 20 meter transceiver.? The 2n2XX uses a 2SC5739 which is on the edge of the PC board.? With a little Gerber change I bet a pair of 2SC5706 transistors could be configured side bye side.? Not sure if the 2N7000 could drive them or if you would want to use a 2SC5706 driver in it's place.)? Jim knows more about this then me.? I just know enough to be dangerous! Lee, w0vt, w5drc |
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Re: Group Introduction: If you're going to post on the group, reply here!
I plan on working with some of the QRP rigs from previous posts this winter when the snow keeps me off of SOTA summits.
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73, Dan KA7GPP -----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf Of Steve Ratzlaff Sent: Saturday, November 9, 2019 10:20 AM To: [email protected] Subject: Re: [qrptech] Group Introduction: If you're going to post on the group, reply here! AA7U here. ____________________________________________________________ Do This Before Bed, Watch Your Belly Fat Melt Like Crazy floraspring.com |
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Re: Group Introduction: If you're going to post on the group, reply here!
My problem is I Forget more than I Learn...guess brain is shrinking
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-Diz On 11/9/19 11:28 AM, Art N4EZZ wrote:
I'll follow along on this one. |
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Re: Group Introduction: If you're going to post on the group, reply here!
WA5BDU reporting. On Sat, Nov 9, 2019 at 10:14 AM Trystan G0KAY <trystandavies@...> wrote: Ryan, |
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Re: Group Introduction: If you're going to post on the group, reply here!
Hi Art,
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If you are not learning you are already dead. At a minimum you learning how it feels to die. Depending on your beliefs maybe you are still learning in the next world. I tell all the kids at graduation open house parties that school doesn't end until you die! Usually they are already mature enough to understand that:) 73, Bill KU8H On 11/9/19 11:28 AM, Art N4EZZ wrote:
I'll follow along on this one. --
bark less - wag more |
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Re: Group Introduction: If you're going to post on the group, reply here!
I'll follow along on this one.
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Long ago someone told me that if you are not learning, you are dying. Since then I have tried to learn something new every day. At 70 now I do tend to be a bit thick headed at times but I keep trying. Hope you folks can teach me something. Art N4EZZ <n4ezz@...> GnuPG key ID 0x6712DD0E ============================= Learn from the mistakes of others, You'll never live long enough to make them all yourself! Larry On 11/9/19 2:44 AM, Trystan G0KAY wrote:
Ryan, |
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Re: DDS VFO!
"NC-40 filter is too narrow for SSB (though I have listened to ? The NC40 uses crystal filters so, referencing the schematic, it would be a simple matter of changing C9-C13 to alter the bandwidth of the filter.? There were a few people on the BITX series radios who replaced the fixed capacitors in the crystal filter with varactor diodes to make the bandwidth variable. ? ? |
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Re: DDS VFO!
On Tue, Nov 5, 2019 at 08:07 AM, Bob Macklin wrote:
NorCal40 As the NorCal 40 uses the SA602/612 GC mixer, the 49er DDS should work just fine.? That said, the SA602/612, unlike many of the mini-circuit mixers (SBL-1 types), is not a 7dBm device, which again, is why the AD9850 DDS from the 49er (W8TEE) works well with that device.? The W8TEE DDS used in the 49er project, has an output level adjustment for tweaking. If using a si5351 DDS, which has more than double the output level of the AD9850, it would be a good idea to pad (attenuator) down the output level down to something more palatable to the SA602/612.? Additionally, and this is just personal experience, putting some level of pad between the DDS and the mixer input lets both devices see a solid 50 ohm impedance which, is a good thing. Robin - AC7LX |
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Re: Arduino Connectors?
¿ªÔÆÌåÓýBob,Besides Samtec you might look for/at the Molex KK series.? Those are .1" excuse me 2.54mm spaced male and female headers.? If you search ebay and Amazon they are often called JST connectors as JST style are used a lot.? The pins are .025" square or round pins and the male headers are usually breakaway style.? I recently bought some of the 20 pin female headers that Rob linked on ebay.? They are not breakaway though.? You do have to cut them and unlike the Molex style you have to sacrifice a pin so if I want a 20 pin female header or 2 of them from the 40 pin strip it ainta gonna happen!? If you try to cut it between pin 20 and 21 you will end up with 2 headers of 19 pins so save yourself some grief and just cut it right over pin 21! In searching I see that Arduino makes or lists those female headers under their brand name.? I just bought a bunch of the 6, 8, and 10 pin stackable female headers from nooelec.com on their ebay store.? I just tried to find them at their non ebay site but do not see them.? Nooelec.com also sells many of the SDR dongles and appears to be their claim to fame. I was just looking and Jameco shows these: I did not look at Adafruit but am sure they also have them. The thing about these "stackable" headers is that they employ long male pins which makes them very convenient for Arduinos because you mount the female header on top of the Arduino and the LONG male pins stick through to also give you the male header to plug in to the module below.? Or you can reverse it depending on whether you need/want the female header on top or bottom but the long pins that go through the board and make the male headers on the other side is very convenient! Here is the Nooelec auction for 200 of the 6 pin female stackable headers: They do seem to be better quality than the ones I have bought from some of the Chinese sellers. When I was looking at Mouser I see that 3M also makes a lot of the male headers and suspect that they have some female headers too but did not look for those specifically. You can also just use a regular 40 pin wide (.6 inch wide) IC socket for I think the Nano in a pinch but IC sockets are not really deep enough.? The stackable ones mentioned above are .4" deep as I recall and an IC socket is maybe 1/16" inch deep or so! I hope that helps. Good luck. Jim Pruitt WA7DUY On 11/8/2019 10:48 AM, Bob Macklin
wrote:
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Re: Send in your QRP Pictures!
Lee, Not really interested in refurbishing. I want to make something my own. This is almost like the OMs who answer my homebrewing questions with "why not just go buy ___?". I know people mean well but I would rather make a boatanchor than buy one. Actually, I've been making some mild steel enclosures to build skill for my eventual 50-lb radio. I'm wanting something more capable than a one-tube oscillator-amplifier. At very least, a MOPA transmitter. I'm also not going to buy FT-243 crystals (too rare and too constricting). I'm either going to figure out a VFO, or I'm going to drive the oscillator stage with a DDS generator. At very least, I'll buy some QRP crystals in the HC-49 case, 3D print or scroll-saw some cases, and build some up that way. If I were using smaller crystals, I'd limit the oscillator stage to 45-75 volts, meaning the crystal heating should be low. Right now I'm finishing up a 6SN7 twin plex receiver. It will do until I can make some kind of superheterodyne rig. A full-blown phone transceiver might be a bit much for working in tubes. I'm not sure what I want to do but I get very little time to build, let alone operate, these days. Ed AE7TE On Fri, Nov 8, 2019 at 9:22 PM Leland L. Bahr <w5drc@...> wrote:
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Alan N8WQ
bleepingbeep
Nick Kennedy
Trystan G0KAY
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