Date   
Re: uBitx V4 test point measurement chart #ubitx #ubitx-help

 

Ted,

What instruments do you have? uBitx works at low signals, the signal at the product detector is almost
the same as at the antenna. I have been using my spectrum analyser to get the levels.

DC voltage chart is possible.

Raj

At 11/01/2019, you wrote:
Raj, et al,

Might I please get my hands on a list or chart with TP levels, for troubleshooting purposes? I did a search here on the forum but came up empty.

Thanks,

Ted
K3RTA

Re: ND6T AGC Troubleshooting

Albert Peter
 

Hi guys,

The new JackAl board for uBITX uses a hybrid JFET circuit for AGC control.  Have a look on   hamradiodesigns.com    and download the User Manual Section 2.  There is a complete AGC circuit in there which works very well.  You do have to break the IF chain in one spot, but nor other modifications and the uBITX reception is not changed.

 

Sent from Mail for Windows 10

 

From: Curt via Groups.Io
Sent: Thursday, January 10, 2019 9:54 PM
To: BITX20@groups.io
Subject: [BITX20] ND6T AGC Troubleshooting

 

I am beside myself that I cannot get this simple circuit doing something with the ubitx.  I am starting with the simple version with a single MOSFET, and I may add the series one later. 

I built one unit - nada.  So I build a second one, and left off the MOSFET.  I have its input attached to high side of the volume control pot (I think it is 10k in the Sunil case version), the ground attached to a connector in the closest corner of the board, and 5 volts from the raduino.  No matter how huge the signal -- I get no rectified voltage output.  What could I be doing wrong?  With hundreds of these boards in uBITX I am surprised by my result thus far. 

I am using a 2n2222A for the NPN, I have tried 3 different devices.  Yes the diodes each work on the DVM, and they are proper orientation. 

I also could not get the VK3YE AGC to work either.  The ubitx receives wonderfully and I am testing on 40m. 

73 Curt

PS - I do have a hybrid cascode but I am thinking to use it in a homebrew Rx -- not sure I wish to 'break' one of the bidirectional amplifiers here.  my goal is just to AGC the very largest signals. 

 

Re: uBitx V4 test point measurement chart #ubitx #ubitx-help

Albert Peter
 

In the next few days I will do a setup and troubleshooting section to the user manual, including test voltages throughout the circuit diagram.  We will post a notice when it is ready.

Thanks for asking.

Al

 

Sent from Mail for Windows 10

 

From: Ted via Groups.Io
Sent: Friday, January 11, 2019 5:46 AM
To: BITX20@groups.io
Subject: [BITX20] uBitx V4 test point measurement chart #ubitx #ubitx-help

 

Raj, et al,

Might I please get my hands on a list or chart with TP levels, for troubleshooting purposes?   I did a search here on the forum but came up empty.

Thanks,

Ted
K3RTA

 

Re: JackAl Encoder question...

Albert Peter
 

Dexter,

That is fine if you have one and if it fits into your panel design.  It was easier for me to drill a couple of hole than to try to retrofit a 5 or 6 jack assembly from an old computer.  But, if It works for you, go for it.

 

Thanks for the suggestion.

Al

 

Sent from Mail for Windows 10

 

From: Dexter N Muir
Sent: Wednesday, January 9, 2019 7:16 PM
To: BITX20@groups.io
Subject: Re: [BITX20] JackAl Encoder question...

 

Isolated headphone jack? How ancient is your junkbox? Old sound cards have them in various forms - even color-coded.
73 de ZL2DEX

 

Re: MAX9814 as AGC preamp for output

Wayne Leake
 

 Ted, the "here" does not take me to the correct place.
 Now I am wondering.
 Best, usually, to paste in the actual URL.
 Wayne WA2YNE

uBitx V4 test point measurement chart #ubitx #ubitx-help

Ted
 

Raj, et al,

Might I please get my hands on a list or chart with TP levels, for troubleshooting purposes?   I did a search here on the forum but came up empty.

Thanks,

Ted
K3RTA

Re: Case for uBITX with Nextion Display

Prathap Naidu
 

Sorry this msg for meant to go direct to Sarma Ji

Anyway new cabinets should launched at the lamakan Ham meet, larc.in  during next week end

tnx 73

Pop

VU2POP

 

From: BITX20@groups.io [mailto:BITX20@groups.io] On Behalf Of Prathap Naidu via Groups.Io
Sent: Friday, January 11, 2019 2:21 PM
To: BITX20@groups.io
Subject: Re: [BITX20] Case for uBITX with Nextion Display

 

Tnx , I saw your post on the group

Will share pictures when the cabinets are ready

Tnx 73

Pop

VU2POP

 

 

From: BITX20@groups.io [mailto:BITX20@groups.io] On Behalf Of MVS Sarma
Sent: Thursday, January 10, 2019 12:07 PM
To: BITX20@groups.io
Subject: Re: [BITX20] Case for uBITX with Nextion Display

 

Pratap is vu2pop 

 

 

On Thu, Jan 10, 2019 at 12:04 PM Mvs Sarma <mvssarma@...> wrote:

I know that Om Pratap vu3pop from Bangalore, India, has developed. He is likely to sell them any time now.

He makes them off GI sheet, with powder coated painting. the cabinet looks elegant.

 

 he could be contacted  on gmail with his call sign

regards

sarma

 vu3zmv

 

On Thu, Jan 10, 2019 at 8:24 AM Doug Person <doug@...> wrote:

I'm wondering if anyone has identified a good case for uBTIX with enough
room for a 3.5" or bigger Nextion display.

I've been browsing around - but I'm just not sure what would work.  Ideas?

--
73 de Doug -- KJ0F


Re: Case for uBITX with Nextion Display

Prathap Naidu
 

Tnx , I saw your post on the group

Will share pictures when the cabinets are ready

Tnx 73

Pop

VU2POP

 

 

From: BITX20@groups.io [mailto:BITX20@groups.io] On Behalf Of MVS Sarma
Sent: Thursday, January 10, 2019 12:07 PM
To: BITX20@groups.io
Subject: Re: [BITX20] Case for uBITX with Nextion Display

 

Pratap is vu2pop 

 

 

On Thu, Jan 10, 2019 at 12:04 PM Mvs Sarma <mvssarma@...> wrote:

I know that Om Pratap vu3pop from Bangalore, India, has developed. He is likely to sell them any time now.

He makes them off GI sheet, with powder coated painting. the cabinet looks elegant.

 

 he could be contacted  on gmail with his call sign

regards

sarma

 vu3zmv

 

On Thu, Jan 10, 2019 at 8:24 AM Doug Person <doug@...> wrote:

I'm wondering if anyone has identified a good case for uBTIX with enough
room for a 3.5" or bigger Nextion display.

I've been browsing around - but I'm just not sure what would work.  Ideas?

--
73 de Doug -- KJ0F



Re: Harmonics and Relay Replacement

 

At 11/01/2019, you wrote:

Even worse, the mercury I fiddled with as a kid, salvaged from thermometers.
This explains all!


Remains to be seen just how hilarious cow farts are.
I use cow methane for cooking and water heating at the farm.

Raj

Re: Tracing receive signal for low signal

Dave Space
 

I need to do some more testing as some of my bench numbers look like they might be better than Jim's.

TP 1 @ 7.150MHZ 700uV gave 0.1 p-p
TP2 "                      200uV gave 0.1 p-p

TP16 took like 300uV to get to 0.1 p-p, so a lot more
TP17 took much more like maybe over 2000uV.. have to go back and measure.  
(It might be my signal generator doesn't get close enough to the BFO.. have to try playing with it a bit more).

Re: Harmonics and Relay Replacement

Jerry Gaffke
 

Good one!
Something tells me that's a staged photo.

Jerry, KE7ER



On Thu, Jan 10, 2019 at 07:21 PM, Ted wrote:
Yeah, the biggest hazard with those relays are the 8 pointy things on the bottom, and that it takes a soldering iron to install them. 

Re: Harmonics and Relay Replacement

Ted
 

Yeah, the biggest hazard with those relays are the 8 pointy things on the bottom, and that it takes a soldering iron to install them. 

Re: Harmonics and Relay Replacement

Dan Schaefer
 

What’s the promotional code.  They seem to be asking for one on the order
Thanks.  
Dan



On Jan 10, 2019, at 1:18 PM, MVS Sarma <mvssarma@...> wrote:

Ted,
 did you watch the warning at the end
 here is it, i quote from that site.
"
MFG: AXICOM/TE
P/N: D2n V23105-A5403-A201
COIL: 12VDC/0.4W/360 ohm
CONTACT RATING: 3A@250VAC/220VDC
ACTION: DPDT
DIP Socket/PC Mount General purpose relay. uULc listed, RoHS compliant.
L: 3/4” W: 3/8” H: 7/16” WT: .005

California Proposition 65 Warning WARNING: This product contains chemicals known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov
(This item was manufactured prior to August 31st, 2018)


On Thu, Jan 10, 2019 at 11:25 PM Ted via Groups.Io <k3rta=yahoo.com@groups.io> wrote:
Just an FYI for people looking to swap out their relays - while they last: M.P. Jones & Accociates at  US$.79 each and they're the right part number, etc.

ND6T AGC Troubleshooting

Curt
 

I am beside myself that I cannot get this simple circuit doing something with the ubitx.  I am starting with the simple version with a single MOSFET, and I may add the series one later. 

I built one unit - nada.  So I build a second one, and left off the MOSFET.  I have its input attached to high side of the volume control pot (I think it is 10k in the Sunil case version), the ground attached to a connector in the closest corner of the board, and 5 volts from the raduino.  No matter how huge the signal -- I get no rectified voltage output.  What could I be doing wrong?  With hundreds of these boards in uBITX I am surprised by my result thus far. 

I am using a 2n2222A for the NPN, I have tried 3 different devices.  Yes the diodes each work on the DVM, and they are proper orientation. 

I also could not get the VK3YE AGC to work either.  The ubitx receives wonderfully and I am testing on 40m. 

73 Curt

PS - I do have a hybrid cascode but I am thinking to use it in a homebrew Rx -- not sure I wish to 'break' one of the bidirectional amplifiers here.  my goal is just to AGC the very largest signals. 

Re: Harmonics and Relay Replacement

Mike Short
 

Everything causes cancer in Kalifornia. Probably living there does too. 


--
Mike
AI4NS

Re: Harmonics and Relay Replacement

Dr. Flywheel
 

Good to be cautious and prudent to warn the public about real threats. However, crying wolf too many times annuls the good intentions. It is a situation very similar to marking all documents as "SECRET" just to see real secrets escaping into the public domain.

--Ron   N7FTZ

On Thu, Jan 10, 2019 at 5:54 PM Bob Lunsford via Groups.Io <nocrud222=yahoo.com@groups.io> wrote:
RE: What, the warning that the state of California believes these will cause reproductive harm?






Re: Output Filter

 

Hi Richard,

There sure does seem to be a problem there.  I guess first thing I would do is put the current LPF design values into a program like Elsie and see if they give the expected curve.  Then you would know where the schematic values are correct or not.  If so, then the inductors should be wound at least according to the toroids.info calculator (which I've always found to be quite accurate).  The only warning would be if the cores used on these sets are kind of non-standard or something.  Of  course measuring is great if you have an accurate meter or a GDO.

73,


Mark.

Re: Harmonics and Relay Replacement

Bob Lunsford <nocrud222@...>
 

RE: What, the warning that the state of California believes these will cause reproductive harm?

Re: Harmonics and Relay Replacement

Bob Lunsford <nocrud222@...>
 

"As of August 2018 the State of California" ... has become even
more confused about such a simple term as "Relevancy."

Bob — KK5R

--------------------------------------------

On Thu, 1/10/19, Carlos Puig <cpuig3141@...> wrote:

Subject: Re: [BITX20] Harmonics and Relay Replacement
To: BITX20@groups.io
Date: Thursday, January 10, 2019, 6:54 PM


Apparently,
the
requirements for these warnings recently changed. 
Here is the
explanation from the MPJA web site, which now has
the Prop 65
warning on *every* single part they sell:



Carlos -
KJ6ST



On 1/10/2019
13:31, Bob Lunsford via
Groups.Io wrote:



That's
like the ceramic tubes used in one conduction cooled
amp by Heathkit that had a warning that said breathing the
dust from that ceramic tube was hazardous. This meant that
they did not recommend anyone use a grinder on them to
take them apart. Only a fool would do that, anyway.

Many of them were sold but I never heard of anyone being
assaulted by the dust.

California has people who sit up nights writing this stuff
up.
If it were a real unavoidable hazard, it would have been
pulled
off the market by the EPA. Still, good to know that there is
a
hazard with the relays. And I bet it is that something
inside
has been soldered. Also, I still use the old tin-lead solder
and
find myself worrying more about things.

Bob — KK5R

--------------------------------------------
On Thu, 1/10/19, Christopher Miller <djmalak2k6@...>
wrote:

Subject: Re: [BITX20] Harmonics and Relay Replacement
To: BITX20@groups.io
Date: Thursday, January 10, 2019, 2:32 PM

Lol! So dont break it
open and lick it? That probably means it contains lead. I
worked in a clean room that used an an acid that would
destroy bone but only after time passed. We had calcium
rich
jelly so you could get to the hospital in time. All that
means is don't be stupid when installing them.

Kf4ftr

Re: Using a HYCAS IF amp in the BITX receiver

Ashhar Farhan
 

scot,
as an aside, you mentioned using the feedback amps from the progressive receiver as drop in replacement. if you do have a spectrum analyzer handy, could you measure the transmit output, say on 28 mhz ssb? 
i was wondering this morning if they would offer substantially better spur reduction as their harmonic output would be lower.

On Fri, 11 Jan 2019, 04:46 Scott McDonald <ka9p@... wrote:
As you may have noticed, Farhan recommended on the HF Signals web site the use of the IF AGC system of Hayward and Damm, commonly known as a HYCAS, as a potential improvement for the uBITX.
 
Finally got around to trying this over the holidays in a uBITX receiver lash up, and was very happy with the results.  The HYCAS system works with a bit less gain up at 12 MHz, and I was seeing about -10 to +35 dB gain on the board with my particular build.  This is a fairly transformative modification.  I rarely found myself reaching for the volume or IF gain control in the three weeks I've been using it so far, and it sounds great.
 
I mention this only because Mike, G4JXX, mhadley157@..., has a limited number of boards (at $15 US plus postage) and kits left, so if you were inclined to experiment with this modification.  Mike told me he was thinking about having some more boards made if there was additional interest.  I've built 3, two at 9 MHz and the uBITX version at 12, and each one has fired up first time and performed well.
 
I have no connection to Mike other than as a satisfied customer, and had contacted Mike originally when Wes Hayward mentioned Mike as a potential source of a quality HYCAS board for another project I was working on.  So if you might be interested in trying this on the uBITX, you may want to reach out to Mike and check the status of his stuff while it's still available, or otherwise encourage his efforts.  Mike also had an ad in the back of the last issue of SPRAT with a bit more info.
 
And just a few other tracks in the sand for anyone else homebrewing uBITX hardware.
 
Kits and Parts offers very reasonable priced matched 12 MHz crystals that worked very well for the homebrew cw and ssb filters used for this experiment.  It may be unseemly not to buy 150 bulk crystals and sort them, but in the end, at a buck and a half a crystal, I got 2 nice filters for less than ordering a pile, and the filters turned out well.  Life is sometimes too short to match crystals, and 6 bucks in crystals for a 4 pole cw IF filter is another cost effective upgrade.
 
The WA8ISP and W0EB Raduino clones were both used in the radio, and both performed very well.
 
And if you are a Progressive Receiver fan, I tested the SBL-1 mixer/2N5109 post amps from Wes' original article as drop in replacements for the TIAS and homebrew mixers, as well as the product detector/ audio board.  They were, literally, drop-ins, and worked great.  The Progressive mixer/post amps have a few dB gain less than the TIAs if you leave the 6 dB pads in, but it was not an issue.
 
YMMV but just thought I'd pass it all along.

Happy building.
 
Scott KA9P