On Aug 3, 2019, at 7:50 AM, Rob French (KC4UPR) <robert@...> wrote:

I've got a new uBITX v5.  I've only been using it for CW so far (haven't gotten around to wiring up the mic yet), but I've noticed that, after calling CQ a half dozen times, the finals get way hot... too hot to hold my finger on for more than a second or so.  

As far as I can tell, my antenna is good to go... according to my antenna analyzer, < 2:1 SWR across 40 meters, which is where I'm using it currently.  I guess I could try doing the same thing into a dummy load to verify that it's not due to an SWR problem.  

Other than loading the KD8CEC firmware and making some firmware configuration settings, I have not deviated from the stock configuration--same finals, same heatsinks, no change to PA bias settings.  

I'm assuming this is not normal.  Any thoughts on resolution?  I'm using a metal case that doesn't quite let me mount the board close enough to back to bolt the finals to the back panel, but I've thought of making a hole in the back panel to accomodate bolting on a larger heatsink.  But I'm also thinking that there may be bigger underlying problem that I address, regardless of whether or not I add a bigger heatsink, fan, etc.

Things I'm thinking I should do:
- Recreate my CQ calling into a dummy load, see how hot they got (does anyone have any metrics for key-down time versus temperature?)
- Measure the current draw on transmit, and/or perform the PA bias calibration from the HF Signals web site
- Build one of those LED SWR meters to back-up my antenna analyzer
- Any other thoughts?

Some are out of alignment on my boards but all the holes are there.Just bear in mind that on my boards I had to add a jump link to give both channels on the headphone socket.As it stands you will only get audio on one side..

Get Outlook for Android

---

From: BITX20@groups.io <BITX20@groups.io> on behalf of Mark Hatch <mark2382@...>
Sent: Saturday, August 3, 2019 7:21:25 AM
To: BITX20@groups.io <BITX20@groups.io>
Subject: Re: [BITX20] amatureradiokits enclosure question #ubitx #ubitx-help

 

I didn’t have to cut any pins in my two kits...  strange how those holes are not aligned...


I agree with Dexter,  looks like this was done by hand.

73
mark

On Aug 3, 2019, at 7:26 AM, Edward Reynolds via Groups.Io <n7snt@...> wrote:

I’d look at the picture on the HFsignals site uBITX wire up section for volume control and compare your connections with picture. Otherwise no answer other than a bad volume controller. Good luck

Ed de N7SNT 

On Aug 2, 2019, at 6:32 PM, Rob French (KC4UPR) <robert@...> wrote:

Super excited, just put together my uBITX and love it, though I haven't successfully managed any 2-way QSOs yet.  I've got a few spots on RBN, so I know something's getting out... Anyway...

I've noticed that the volume control (I'm using the stock potentiometer) is super sensitive at the low end.  i.e. As soon as I turn it on, I never turn it more than about 1/4 turn.  And if I go more, it distorts super quickly.  Very small adjustments of the knob change the volume pretty drastically.  I actually wondered if I wired the pot backwards!  But, I checked against the schematic and also this page ( https://ubitx.net/wiring-up-the-volume-control/ ), and as far as I can tell, I've done it right (green, orange, yellow, from L to R).  Any other thoughts?

Thanks!
Rob KC4UPR

Super excited, just put together my uBITX and love it, though I haven't successfully managed any 2-way QSOs yet.  I've got a few spots on RBN, so I know something's getting out... Anyway...

I've noticed that the volume control (I'm using the stock potentiometer) is super sensitive at the low end.  i.e. As soon as I turn it on, I never turn it more than about 1/4 turn.  And if I go more, it distorts super quickly.  Very small adjustments of the knob change the volume pretty drastically.  I actually wondered if I wired the pot backwards!  But, I checked against the schematic and also this page ( https://ubitx.net/wiring-up-the-volume-control/ ), and as far as I can tell, I've done it right (green, orange, yellow, from L to R).  Any other thoughts?

Thanks!
Rob KC4UPR

On Thu, Aug 1, 2019 at 02:39 AM, David Wilcox wrote:

 The reference manual reads like a college text book

Hi,

I've looked at the "Analog Discovery" Digilent scopes. I can understand why the manual would be a densely packed tome. The Analog Discovery is nearly a universal device and the whole universe of what is does as well as how to create those universes is likely covered in the manual. 

So for a beginner you have to take a big bite to get through it.

However, if you just pick out one thing, the simplest examples that hopefully exist in the manual of how to look at analog analog waveforms and go with that for now, likely you can have some success and fun learning how to use an Oscilloscope. Even though the scope first requires you to understand how to make the circuitry in the Digilent device to "assemble" itself into an oscilloscope by doing something from the control software to upload the "scope circuitry" to the Digilent device.

If you stick with the "Analog Discovery" module it looks like you can get a lot of mileage out of it as you learn more.  Hopefully, there are videos that users of the device have put up in an effort to help others use it. Once you get through that you should be able to relate the instructions/videos on more generic scopes to what to do on the Digilent scope.

Tom, wb6b

I think that paypal has tweaked something and the old style button had stopped working. I will fix the raduino too.

- f

On Sat 3 Aug, 2019, 3:17 AM Jerry Gaffke via Groups.Io, <jgaffke=yahoo.com@groups.io> wrote:

While you are at it, include a way to buy a Raduino.
That option seems to have disappeared from hfsignals.com

On Thu, Aug 1, 2019 at 07:21 PM, Ashhar Farhan wrote:

Yup,  'Group, we have a problem'. I will fix this Paypal trouble in 24 hours. Aah, the joys of Paypal customer service, here we go again...

- f

Yup,  'Group, we have a problem'. I will fix this Paypal trouble in 24 hours. Aah, the joys of Paypal customer service, here we go again...

- f