Date   
Re: Antuino

Bruce Hall
 

Linearity issues aside, the Antuino is very handy for evaluating and aligning RF filters.  Attached photo is a 30M bandpass filter under test.  Measuring insertion loss, center frequency and bandwidth are all straightforward.  (Note: the 1X oscilloscope probes aren't the best choice but were on the bench.  They add attenuation without significantly changing the filter shape.)

Bruce


On Wed, May 29, 2019 at 3:31 AM Ashhar Farhan <farhanbox@...> wrote:
I guess, we need a better post mix amplifier? probably increasing the current there will help? I am not sure where this non-linearity is coming from. I suppose at least 70 db of linear range will be good. this is about 50 db.

- f

Re: uBITX will not turn on

Martin Potter
 

KK6ISP wrote :
"And in general many RF devices will show approx. 0 ohms DC resistance for one reason or another."

Clark,
The reason is reactance, which is frequency dependent. See the relevant section of any edition of the Radio Amateurs' Handbook.
73,
... Martin VE3OAT

Re: W8TEE Mag Loop Testing

Doug W
 

On Thu, May 30, 2019 at 12:19 PM, Jack Purdum wrote:
We plan on testing later today starting at 3PM EST on 7.050MHz
No joy at EN52.  I installed a trial of CW Skimmer to try to rx you.  I picked up enough other traffic to know I at least set it up right.
 
--
www.bitxmap.com

Re: Power supply for Biix40?

Ian Reeve
 

From a UK point of view, the mains plug is absolutely non compliant having no internal replaceable fuse.

I have seen this type of plug before on equipment and absolutely would immediately replace it with a compliant plug.

I can of course not comment on any plug moulded for connection to any other countries mains supply.

 

It is also a concern that there seems to be a lack of safety markings.

 

I would look elsewhere. Switching mode power supplies generally generate unwanted qrm which you would not want when receiving weak radio signals.

 

Just my thoughts about the UK version

 

 

 

Sent from Mail for Windows 10

 


From: BITX20@groups.io <BITX20@groups.io> on behalf of Bob Recny <n8sqt@...>
Sent: Thursday, May 30, 2019 7:46:52 PM
To: BITX20@groups.io
Subject: Re: [BITX20] Power supply for Biix40?
 
I don't see any safety marks (UL, ETL, CE, etc.) for something that plugs into the mains.

On Thu, May 30, 2019 at 11:21 AM John Cardoso <ve9pct@...> wrote:
Hi folks,
Can I use a switching power supply like this one
https://www.banggood.com/Excellway-3-12V-5A-60W-ACDC-Adapter-Switching-Power-Supply-Regulated-Power-Adapter-Display-p-1278019.html?rmmds=search&ID=47184&cur_warehouse=CN
to work without problems on Bixt40?
Thanks in advance
-John-

Re: Nextion 5/Enhanced for KD8CEC 1.2?

Sam Tedesco
 

Might be worth the time to delete any unused code, comments, etc and recompile. Space is really a premium at this point.

Re: Keyer for ubitx #ubitxcw

Sam Tedesco
 

Hi Kelly,

I still owe you a pic. Were you able to get any further on this?

Re: Power supply for Biix40?

fejohnso
 

It will work using a switching power supply--some are noisier than others or just use a 12v battery.  I also converted a P/C power supply to run mine, not as quiet as a batt but it works.  

On Thursday, May 30, 2019, 2:21:01 PM EDT, John Cardoso <ve9pct@...> wrote:


Hi folks,
Can I use a switching power supply like this one
https://www.banggood.com/Excellway-3-12V-5A-60W-ACDC-Adapter-Switching-Power-Supply-Regulated-Power-Adapter-Display-p-1278019.html?rmmds=search&ID=47184&cur_warehouse=CN
to work without problems on Bixt40?
Thanks in advance
-John-

Re: W8TEE Mag Loop Testing

fejohnso
 

What's RBN?

On Thursday, May 30, 2019, 1:19:41 PM EDT, Jack Purdum via Groups.Io <jjpurdum@...> wrote:


All:

Today we began testing Al's new mag loop (ML) design, shown here:

Inline image

It's a 40-30-20M "luggable" loop. It's about 3' in diameter, breaks down so it fits in a car, and we can get almost 1.1:1.0 on all three bands with our remote controller. (Peter Parker might use it on the beach down under, but most of us won't use it as a walkable antenna.) We ran some tests today and did see RBN reports so we know it radiates. However, it's not waterproof yet and the rains moved in...again. We plan on testing later today starting at 3PM EST on 7.050MHz. We will be transmitting on two antennas: 1) the ML and 2) an EFHW in an attempt to get some meaningful comparisons. We expect to run about 20W of power. We will alternate between the two, but you won't know which is which. After about 45 minutes and it the weather holds, we will move up to 14.080MHz to repeat the tests.

If you have time around then, use the RBN to report what you're hearing. We'd really appreciate it!

Jack, W8TEE
Al, AC8GY

Re: VU Meter from Sunil

 

I don't mean to hijack this thread but it's kind of related. I am struggling to figure out how to interface the AGC board that came with Sunil's uBitx/Nextion case to a V4 uBitx board. I have the S meter all hooked up and calibrated per the instructions that came on the CD with the case, that is responding just like the instructions say, setting the upper and lower limits of the meter. The part I can't understand is where the first IF audio plugs into the AGC board and how the audio gets back to the audio output. Man am I confused. Has anyone got this working? Care to share how you did it?

Joel
N6ALT

Preliminary results -- W8TEE/AC8GY Mag Loop Testing

Jack, W8TEE
 

All:

Conditions were not ideal, but we did get some RBN reports. While it's far too soon to say much, it appears the mag loop gives up about 1-2dB over the EFHW, which is up about 60' or so. VE8JY in Alberta heard us, but looking at their antenna system, they can probably still hear Jimmy Hoffa's last conversation. Also, we did get some rain during the test period which forced us to stop for a while. We tried to protect the cap, but were not totally successful. We are going to try again after we iron out some hiccups that showed up during the test. We also need to put it in a protective case.

About the design. The feed loop is rotatable (by hand right now), but we do not think it's worth the effort to motorize it. The software driving the cap via a stepper motor works pretty well, but we think we can refine it somewhat. We are about 50' away from the ML and the control aspects seem to work just fine. Why the 4-loop construction? Because we wanted to be able to fit the loop in the truck of a car without killing the efficiency. True, it's not an Alex loop, but we didn't intend it to be. On the other hand, it's going to be cheaper than most portable antennas and it can handle considerably more power than most. We have more tests in mind down the road, but we are encouraged by the results.

To all of you who tried to give us a listen today, Al and I very much appreciate your efforts on our behalf.

Jack, W8TEE

On Thursday, May 30, 2019, 1:18:40 PM EDT, Jack Purdum <jjpurdum@...> wrote:


All:

Today we began testing Al's new mag loop (ML) design, shown here:

Inline image

It's a 40-30-20M "luggable" loop. It's about 3' in diameter, breaks down so it fits in a car, and we can get almost 1.1:1.0 on all three bands with our remote controller. (Peter Parker might use it on the beach down under, but most of us won't use it as a walkable antenna.) We ran some tests today and did see RBN reports so we know it radiates. However, it's not waterproof yet and the rains moved in...again. We plan on testing later today starting at 3PM EST on 7.050MHz. We will be transmitting on two antennas: 1) the ML and 2) an EFHW in an attempt to get some meaningful comparisons. We expect to run about 20W of power. We will alternate between the two, but you won't know which is which. After about 45 minutes and it the weather holds, we will move up to 14.080MHz to repeat the tests.

If you have time around then, use the RBN to report what you're hearing. We'd really appreciate it!

Jack, W8TEE
Al, AC8GY

Re: Power supply for Biix40?

Sam Tedesco
 

I just like the pic of the ps at 24v with the pot at the off position and it's only rated for 12v. 

Re: W8TEE Mag Loop Testing

Jack, W8TEE
 

Reverse Beacon Network (Welcome! - Reverse Beacon Network)


It's useful for testing because listeners around the world function as spotters and can give you a signal report.


Jack, W8TEE


On Thursday, May 30, 2019, 4:53:39 PM EDT, fejohnso via Groups.Io <fejohnso@...> wrote:


What's RBN?

On Thursday, May 30, 2019, 1:19:41 PM EDT, Jack Purdum via Groups.Io <jjpurdum@...> wrote:


All:

Today we began testing Al's new mag loop (ML) design, shown here:

Inline image

It's a 40-30-20M "luggable" loop. It's about 3' in diameter, breaks down so it fits in a car, and we can get almost 1.1:1.0 on all three bands with our remote controller. (Peter Parker might use it on the beach down under, but most of us won't use it as a walkable antenna.) We ran some tests today and did see RBN reports so we know it radiates. However, it's not waterproof yet and the rains moved in...again. We plan on testing later today starting at 3PM EST on 7.050MHz. We will be transmitting on two antennas: 1) the ML and 2) an EFHW in an attempt to get some meaningful comparisons. We expect to run about 20W of power. We will alternate between the two, but you won't know which is which. After about 45 minutes and it the weather holds, we will move up to 14.080MHz to repeat the tests.

If you have time around then, use the RBN to report what you're hearing. We'd really appreciate it!

Jack, W8TEE
Al, AC8GY

Re: W8TEE Mag Loop Testing

Jack, W8TEE
 

Yep, we know about the HV issues. The cap is run by a NEMA 17 stepper which Al has geared down. The stepper controller goes to 1/32. We're still experimenting with timer interrupts to slow it even more, and then speed it up. More work.

Jack, W8TEE

On Thursday, May 30, 2019, 2:56:00 PM EDT, Jim <Jscook@...> wrote:


That’s a nice looking loop. What are you driving the cap with? I found a nice Comet vacuum variable capacitor and also a drive set up for it. Haven’t gone any further. Keep the group updated. Watch the HV around the cap as it can get high..safety.
Jim
WA3APC


Re: Power supply for Biix40?

Kelly Mabry
 

I bought a 12v 6a supply from ebay.  That plugs into a wall socket, I have plans to include a battery pack in mine for portable ops.
73, 
Kelly KD5AJ 

Re: Power supply for Biix40?

John Cardoso
 

Thank you folks for your replies, Sam, Bob, Ian, fejohnso, etc... :)  much appreciated.
I was/am mostly concerned about possible noise interference (due to their high switching frequencies) with the Bitx40.  I think I would have some trouble :(
Thank you all again.

BITX 40 not tuning

lbjunk@...
 

I wired up the BITX 40 and triple checked my wiring, it is correct as far as I can tell.  When I power it on the frequency is stuck on 7.106...  I am unable to change the frequency.  Any help or ideas would be appreicated.

Re: uBITX will not turn on

Clark Martin
 

I’m quite familiar with reactance from years of working with it.

Clark Martin
KK6ISP

On May 30, 2019, at 12:11 PM, Martin Potter <ve3oat@...> wrote:

KK6ISP wrote :
"And in general many RF devices will show approx. 0 ohms DC resistance for one reason or another."

Clark,
The reason is reactance, which is frequency dependent. See the relevant section of any edition of the Radio Amateurs' Handbook.
73,

Re: W8TEE Mag Loop Testing

Terry Morris
 

I think Peter uses either Rubbermaid or Tupperware for water resistant his variable capacitor. Or, you might try an inverted Glad sandwich bag draped over the wood block and Vari/cap to protect from water.   LOL :)


Terry - KB8AMZ
Brimfield Twp, OH USA EN91hd
Linux User# 412308, Ubuntu User# 34905, PCARS#78, NAQCC#6668, QRP-ARCI#8855, SKCC#14195


On Thu, May 30, 2019 at 5:06 PM Jack Purdum via Groups.Io <jjpurdum=yahoo.com@groups.io> wrote:
Yep, we know about the HV issues. The cap is run by a NEMA 17 stepper which Al has geared down. The stepper controller goes to 1/32. We're still experimenting with timer interrupts to slow it even more, and then speed it up. More work.

Jack, W8TEE

On Thursday, May 30, 2019, 2:56:00 PM EDT, Jim <Jscook@...> wrote:


That’s a nice looking loop. What are you driving the cap with? I found a nice Comet vacuum variable capacitor and also a drive set up for it. Haven’t gone any further. Keep the group updated. Watch the HV around the cap as it can get high..safety.
Jim
WA3APC


Re: Preliminary results -- W8TEE/AC8GY Mag Loop Testing

Terry Morris
 

Looks like a great job of pipe bending.

Terry - KB8AMZ
Brimfield Twp, OH USA EN91hd
Linux User# 412308, Ubuntu User# 34905, PCARS#78, NAQCC#6668, QRP-ARCI#8855, SKCC#14195


On Thu, May 30, 2019 at 4:54 PM Jack Purdum via Groups.Io <jjpurdum=yahoo.com@groups.io> wrote:
All:

Conditions were not ideal, but we did get some RBN reports. While it's far too soon to say much, it appears the mag loop gives up about 1-2dB over the EFHW, which is up about 60' or so. VE8JY in Alberta heard us, but looking at their antenna system, they can probably still hear Jimmy Hoffa's last conversation. Also, we did get some rain during the test period which forced us to stop for a while. We tried to protect the cap, but were not totally successful. We are going to try again after we iron out some hiccups that showed up during the test. We also need to put it in a protective case.

About the design. The feed loop is rotatable (by hand right now), but we do not think it's worth the effort to motorize it. The software driving the cap via a stepper motor works pretty well, but we think we can refine it somewhat. We are about 50' away from the ML and the control aspects seem to work just fine. Why the 4-loop construction? Because we wanted to be able to fit the loop in the truck of a car without killing the efficiency. True, it's not an Alex loop, but we didn't intend it to be. On the other hand, it's going to be cheaper than most portable antennas and it can handle considerably more power than most. We have more tests in mind down the road, but we are encouraged by the results.

To all of you who tried to give us a listen today, Al and I very much appreciate your efforts on our behalf.

Jack, W8TEE

On Thursday, May 30, 2019, 1:18:40 PM EDT, Jack Purdum <jjpurdum@...> wrote:


All:

Today we began testing Al's new mag loop (ML) design, shown here:

Inline image

It's a 40-30-20M "luggable" loop. It's about 3' in diameter, breaks down so it fits in a car, and we can get almost 1.1:1.0 on all three bands with our remote controller. (Peter Parker might use it on the beach down under, but most of us won't use it as a walkable antenna.) We ran some tests today and did see RBN reports so we know it radiates. However, it's not waterproof yet and the rains moved in...again. We plan on testing later today starting at 3PM EST on 7.050MHz. We will be transmitting on two antennas: 1) the ML and 2) an EFHW in an attempt to get some meaningful comparisons. We expect to run about 20W of power. We will alternate between the two, but you won't know which is which. After about 45 minutes and it the weather holds, we will move up to 14.080MHz to repeat the tests.

If you have time around then, use the RBN to report what you're hearing. We'd really appreciate it!

Jack, W8TEE
Al, AC8GY

Re: uBITX will not turn on

giant
 

Oh, the way you describe the power wiring makes more sense. The directions I saw said to wire the red to the pot switch and did not mention to run the brown with it. My brown is still going to the 3 pin connector directly. I will change this since that configuration would make more sense, but I don't see how that would cause my issue.