Re: Enclosure #parts and cooling
#parts
That would probably work, but I don't really need anything that elaborate. I think a fan with some ferrite beads on it will do.
Jack, W8TEE
On Wednesday, June 27, 2018, 3:47:17 PM EDT, Arvo KD9HLC via Groups.Io <arvopl@...> wrote:
On Wed, Jun 27, 2018 at 12:16 pm, Jack Purdum wrote:
3M took it and circulated the liquid over electronics for cooling. I'm trying to locate some of it for my uBITX!
I scavenged a heat pipe system from a laptop.? It has a pad that was in contact with the CPU, and a set of fins that were ducted to the fan. Is that what you mean?
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Re: Enclosure #parts and cooling
#parts
On Wed, Jun 27, 2018 at 12:16 pm, Jack Purdum wrote:
3M took it and circulated the liquid over electronics for cooling. I'm trying to locate some of it for my uBITX!
I scavenged a heat pipe system from a laptop.? It has a pad that was in contact with the CPU, and a set of fins that were ducted to the fan. Is that what you mean?
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Re: RFI from uBitx TX after AGC and other mods installed
Hi Don -- here are the results of my test:
1)? Unplugged AGC board from main PCB.? Jumpered the header on the main PCB.? Left all wires connected to the AGC board that was now "hanging in space" above the main PCB.? Result:? much reduced RFI - still audible but at a tolerable level
2)? Same as (1) with jumper removed from header on the main PCB.? Result:? same as (1) - RFI present but much reduced
3)? Same as (2) plus disconnect S-meter lead.? Result:? Same as (1) and (2)
4)? Same as (3) plus short J1 to ground.? Result:? Same as (1), (2) and (3) - actually no difference with J1 or J4 shorted to ground - I have J5 shorted to ground in all cases.
Similarly, with the AGC board plugged into the header on the main PCB, none of the changes in steps (3) or (4) affect the level of the RFI heard.
Two other things that come to mind:
1)? I don't think AGC is working - I don't see any shorts or disconnected components on inspecting the AGC board, but I'm not noticing any difference in received signals.? So perhaps a problem with my construction of the board and could this cause the RFI?
2)? I used Dupont jumper wires to connect to the headers on the AGC board (and soldered the other end of the Dupont wire to the appropriate control.? Wondering if the use of a header and push-on connector could be introducing RFI?? It sure has been useful in trying A/B test cases though!
73,
Rowland K4XD
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Re: Enclosure #parts and cooling
#parts
I did not know what it was called. Still, at $472 (smallest quantity I found), I'll probably stick to a small fan!
Jack, W8TEE
On Wednesday, June 27, 2018, 3:19:49 PM EDT, Stephanus K6NG <stephanus1@...> wrote:
On Wed, Jun 27, 2018 at 12:16 pm, Jack Purdum wrote:
3M took it and circulated the liquid over electronics for cooling
Flourinert FC-72
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Re: Enclosure #parts and cooling
#parts
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From Howard's post I only see two do not enter signs. I see everyone else's photos but not Howards??
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Enclosure #parts and cooling
#parts
3M used to allow anyone who wanted to do so, to experiment in their labs. One guy invented a liquid that had unique properties, including letting animals "breathe" in it completely submerged. Also, it was totally non-conductive. Still, the guy walked away from it as interesting, but non-commercial. 3M took it and circulated the liquid over electronics for cooling. I'm trying to locate some of it for my uBITX!
Jack, W8TEE
On Wednesday, June 27, 2018, 3:09:32 PM EDT, Arv Evans <arvid.evans@...> wrote:
Hmmm...maybe power the RF PA section through the Peltier device with a
heat sink on the outside of the case and another one with small fan on the
inside of the case to stir the cool air.?? 8-)
Arv
On Wed, Jun 27, 2018 at 12:44 PM Jack Purdum via Groups.Io <jjpurdum= [email protected]> wrote:
Probably a higher power draw than I want.
Jack, W8TEE
On Wednesday, June 27, 2018, 1:33:37 PM EDT, Larry Smith < 815cpu@...> wrote:
How about the Peltier Cooling Device for an idea.? Exhaust the hot air through a check flap/valve idea 73
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Re: Keypad for Raduino...?
Texas Instruments also has a programmable I2C I/O expander that lets you configure eight pins individually as inputs or outputs.? See TI part no. TCA9534A.? You already have an I2C port, so the expander IC adds only one component.? I have seen the A/D-input technique several times a,d would advise against using it because of electrical noise and the lack of precise measurements.
--
Jon Titus, KZ1G
Herriman, UT USA
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Hmmm...maybe power the RF PA section through the Peltier device with a
heat sink on the outside of the case and another one with small fan on the
inside of the case to stir the cool air.?? 8-)
Arv
On Wed, Jun 27, 2018 at 12:44 PM Jack Purdum via Groups.Io <jjpurdum= [email protected]> wrote:
Probably a higher power draw than I want.
Jack, W8TEE
On Wednesday, June 27, 2018, 1:33:37 PM EDT, Larry Smith < 815cpu@...> wrote:
How about the Peltier Cooling Device for an idea.? Exhaust the hot air through a check flap/valve idea 73
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Re: #ubitx safely putting on tight tuning knob
#ubitx
We grappled with the same tuning issue, especially since we were using an encoder push to change the tuning increment. Our experience is that once the rig is "set up", the most common actions are tuning and changing the frequency increment. We've added a second encoder to handle most of the "set up" duties where needed (e.g., setting WPM for the keyer, setting tuning skirts, etc.). However, we came up with what we call ALS Tuning. When the main tuning encoder is being used (e.g., Tuning State), the second encoder automatically has a tuning increment which is 1/10 of the main tuning increment. (The user could change this ration if they wanted to.) So, if the main increment is 1KHz, the ALS Tuning increment is 100Hz. This allows the user to tune reasonably fast across the band, but fine-tune when they approach the desired frequency, but without any kind of button push.? The really nice thing about ALS is that you don't have to "reset" the increment each time you make a large move in frequency. Some approaches use presses on the encoder to "cycle back" to the original encoder value. The code to do this is really simple.
Jack, W8TEE
On Wednesday, June 27, 2018, 1:29:01 PM EDT, Rob Bleumer <Bleumer@...> wrote:
 Ls? My solutio? for the fragil tuning knob: Put a push switch parallel to the switch of te decoder (Enter) and velten beneath the tuning knob.? Than t doesnot change the frequency if touched. Much easyer to work with.
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Probably a higher power draw than I want.
Jack, W8TEE
On Wednesday, June 27, 2018, 1:33:37 PM EDT, Larry Smith <815cpu@...> wrote:
How about the Peltier Cooling Device for an idea.? Exhaust the hot air through a check flap/valve idea 73
On Wed, Jun 27, 2018 at 9:27 AM, Jack Purdum via Groups.Io <jjpurdum@...> wrote:
I'm thinking about using an Apache case from Harbor Freight. However, I need a way to cool the PA's with some kind of fan, but without destroying the watertight nature of the case. I'm going to use a clear acrylic top for all external connectors/controls. I'm pretty sure there will be enough room for a battery pack, too.
Jack, W8TEE
On Wednesday, June 27, 2018, 10:08:02 AM EDT, Jamie Anderson < jamiea@...> wrote:
I really like that look.? Where did you get that briefcase and how did you create the front face metal panel???
I am toying with the idea of a setup like that or maybe an ammo box setup where I build a metal panel to hold the radio either facing the long side like yours or possibly facing the edge like a typical radio so I can maybe throw a mobile dual band rig in there with it. I'm not sure where I will end up yet.
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Re: Worked the SKCC Sprint with my uBITX
Hi Bill,
I finally connected my computer sound card and started Spectran to serve as my CW filter. I works great. But! I had forgotten about the processing lag. When I tapped the key the dit didn't come out right away. I remembered in a big hurry. Later I plugged in my NEScaf and that did the job without the lag.
73,
t'uther Bill KU8H
toggle quoted message
Show quoted text
On 06/27/2018 11:41 AM, Bill Carpenter wrote: I used my uBITX in the SKCC sprint last night and it performed very
well. I have the ND6T click kit installed but have not done the AGC kit
yet so I had to ride the volume control a bit! I used a Four States QRP
Hi-Per-Mite outboard audio CW filter which I highly recommend. Managed
23 contacts during the 2 hour event on 20 and 40 meters. Had a blast.
73, Bill NZ0T
--
bark less - wag more
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How about the Peltier Cooling Device for an idea.? Exhaust the hot air through a check flap/valve idea 73
On Wed, Jun 27, 2018 at 9:27 AM, Jack Purdum via Groups.Io <jjpurdum@...> wrote:
I'm thinking about using an Apache case from Harbor Freight. However, I need a way to cool the PA's with some kind of fan, but without destroying the watertight nature of the case. I'm going to use a clear acrylic top for all external connectors/controls. I'm pretty sure there will be enough room for a battery pack, too.
Jack, W8TEE
On Wednesday, June 27, 2018, 10:08:02 AM EDT, Jamie Anderson < jamiea@...> wrote:
I really like that look.? Where did you get that briefcase and how did you create the front face metal panel???
I am toying with the idea of a setup like that or maybe an ammo box setup where I build a metal panel to hold the radio either facing the long side like yours or possibly facing the edge like a typical radio so I can maybe throw a mobile dual band rig in there with it. I'm not sure where I will end up yet.
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Re: #ubitx safely putting on tight tuning knob
#ubitx
 Ls? My solutio? for the fragil tuning knob: Put a push switch parallel to the switch of te decoder (Enter) and velten beneath the tuning knob.? Than t doesnot change the frequency if touched. Much easyer to work with.
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On Wed, Jun 27, 2018 at 10:10 am, <dl2qa@...> wrote:
Display Shows nothing.
Nothing is a vague description.? Do you mean the display does not light up at all or it lights up blank or it lights up and displays something but not what you expected or something else?? The more information you provide the more help you will get.? If you are not sure how to describe what is happening a picture could help. ? --
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after building trx in case .Display Shows nothing.
No vfo Output no rx/tx
can anyone help. ??
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On Wed, Jun 27, 2018 at 08:11 am, M Garza wrote:
You could use a single sheet of aluminum metal stock, and mount the PA transistors to that.
One consideration for that kind of design is the managing moisture on the inside of the enclosure.? The PA transistors could end up being the coolest part of the the inside of the case which would cause condensation on them.? Having wet PA transistors might be a problem when keying up TX.
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All nice builds!? ?Enclosure choices at:?? 
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"Just an idea."
But a good one!
Jack, W8TEE
On Wednesday, June 27, 2018, 11:11:49 AM EDT, M Garza <mgarza896@...> wrote:
Jack,? You could use a single sheet of aluminum metal stock, and mount the PA transistors to that.? It could have a lip that the acrylic could bolt onto. You could use aluminum angle stock to make the lip and just bolt the acrylic and aluminum sheet to it.? If you have a way to bend? the aluminum sheet metal, you could just fold in the lip on it and make it out of 1 piece of aluminum.? You could put it on the side that will be exposed to allow the air to circulate.??
Here is a very bad ASCII drawing:
=========================? ? ?<- Acrylic sheet
? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ---|? ? ?<- Aluminum lip (aluminum angle stock or folded metal) ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? |? ? ? <- Aluminum sheet stock ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? | ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? |
Just an idea.
Marco - KG5PRT
On Wed, Jun 27, 2018 at 9:52 AM Jack Purdum via Groups.Io <jjpurdum= [email protected]> wrote:
I will probably upgrade the heat sinks and the fan will be mounted either on the top or the interior side of the case. I'm not a big fan of top vents for cooling. I may mount a small speaker on the top with holes for that, but the speaker will be "sealed" to the top. (The larger Apache case will likely have a vertical separator, with the paddle, headphones, and battery pack in the other half. I will probably mount the fan on that vertical partition. That way, if I spill something or it's starts raining, liquid won't get into the xcvr section of the case.) I will need some kind of cooling as the JackAl board draws enough current to heat the regulators up a bit.
Jack, W8TEE
On Wednesday, June 27, 2018, 10:39:39 AM EDT, Doug W < dougwilner@...> wrote:
On Wed, Jun 27, 2018 at 07:27 am, Jack Purdum wrote:
need a way to cool the PA's with some kind of fan, but without destroying the watertight nature of the case
I'm assuming you will be operating with the case open.? I haven't done the math but I would think unless you fall asleep on the ptt or your key I doubt you would need anything more than some vent holes in your acrylic plate.? You could upgrade the heat sinks for insurance.? If you really want a fan why couldn't you just put in the acrylic? ? --
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Re: Easy, Inexpensive Cooling Fan, Excelway Case
Yep. I already bought some for that very purpose!
Jack, W8TEE
On Wednesday, June 27, 2018, 11:31:30 AM EDT, Michael Babineau <mbabineau.ve3wmb@...> wrote:
If the fan is generating RF noise, ?that can often be cured but putting ferrite beads on both of the leads as close to the body of the fan as practical.
RF has a way of sneaking around on DC power leads if you are not careful.?
Cheers
Michael VE3WMB
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Arvo W0VRA