Date   
Re: YOTA 2018

Hans Summers
 

Hi Simas

Yes... correct... the QSX as constructed at the YOTA buildathon in South Africa in August 2018 didn't have the final version of the firmware; not just that, the firmware did not even function as a transceiver. So that is all to come - and I am very sorry that it has taken so long but I WILL get it all sorted out, as soon as I can. 

73 Hans G0UPL

On Thu, May 2, 2019 at 6:10 PM Simas Pudziuvelis <simas.pudziuvelis@...> wrote:
We are desperate for any news regarding QSX. Right now it's just a glorified inductance meter/signal generator.

Using an FT817 with the 10W Linear PA

Andrew Lincoln
 

Hi Hans,

A question about using your 10W Linear PA with an FT817.
You mentioned before that the output of the FT817 would need to be reduced to be used with the PA.
When using the FT817 on digital modes and possibly ssb, I read it’s best to set it to run on full power 5w and use the audio drive to control the power output. I set my FT817 to 5w and adjust the audio drive until it’s outputting about 2.5w which is better for the PA’s and stops the signal from being over driven.
Would you recommend that I run the FT817 at about 2.5w and then feed your PA via an attenuator to reduce the power? Or would you recommend setting the FT817 to it’s lowest power 500mw and the feed your PA via attenuator to lower the power?

Also do you know of any good links for attenuator circuits/pads?


Thank you

Andrew.

Re: Hamvention 2019

Kees T
 

Bill,

That's funny. ...."bolted to the table", .............but will Hans be "leaving" with the prototype ? He might be bringing an auctioneer buddy. This hobby is great fun and entertainment., better than gathering at McDonalds for senior coffee.

Next thing we'll hear is someone trying to buy one from the YOTA kids.

73 Kees K5BCQ

Re: YOTA 2018

Simas Pudziuvelis
 

We are desperate for any news regarding QSX. Right now it's just a glorified inductance meter/signal generator.

YOTA 2018

Daniel Walter
 

Hans,

Just curious as to how the YOTA kids are doing with their early model QSX's. 

--
73, Dan  NM3A

Re: Amplify U3S CLK0 output to drive this MF amp question?

Chris Wilson
 

Hello Hans,

Thursday, May 2, 2019

Thanks and understood Hans, an enviable situation to be in :)


Best regards,
Chris 2E0ILY mailto:chris@...


HS> Hi Chris



HS> Yes I WILL be able to fix it... but at the moment there are
HS> hoards of people waiting for QSX so I am trying to prioritize on that... 


HS> 73 Hans G0UPL
HS> http://qrp-labs.com
HS> On Tue, Apr 30, 2019 at 4:17 PM Chris Wilson <chris@...> wrote:

HS> Hello Hans,
HS>
HS>  Monday, April 29, 2019
HS>
HS>  I was going on the Si5351A data sheet that I read as saying the CLK
HS>  outputs are 0.6V, I am now hoping I am being thick or
HS>  misunderstanding it! Thank you Hans :)
HS>
HS> Will you ever be able to have a look at the U3S issue with Iv option
HS> please? I have a feeling what's happening is for whatever reason CLK1
HS> *IS NOT* having the Park mode reliably disabled when Iv is set to 1.
HS> So an output is always apparent on CLK1, which is not what's needed. I
HS> think this is apparent wit X2 on and off. Probably only Hans can delve
HS> that deep! But if anyone feels like `scoping CLK0 and CLK1 with Iv set
HS> to 1 and X2 on and off I'd sure appreciate confirmation of what I am
HS> seeing here. Thanks.
HS>
HS>
HS> Best regards,
HS>  Chris    2E0ILY       mailto:chris@...
HS>
HS>
HS>> Hi Chris
HS>
HS>
HS>> Why can't it drive it directly? Your quoted text says anything
HS>> over 2.5V pk-pk and later says that includes any 3.3V system
HS>> (logical). The Clk0 output should be at least 3.3V pk-pk since the
HS>> QRP Labs Synth kits are normally set up a bit on the higher side
HS>> of the nominal voltage e.g. 3.5V.
HS>
HS>
HS>> 73 Hans G0UPL 
HS>> http://qrp-labs.com 
HS>> On Mon, Apr 29, 2019, 14:43 Chris Wilson <chris@...> wrote:
HS>
HS>> Chris Wilson 29 April 2019
HS>> 
HS>> 
HS>>  A  friend  is  wanting  to get onto MF but has a tiny garden, so I am
HS>>  allowing him to work portable from my fairly large site and aerial. He
HS>>  will  use my U3S to drive a G0MRF 300W MF Class D amp. The build notes
HS>>  say this:
HS>> 
HS>>  "A signal at twice the desired frequency is applied to the input
HS>>  connector. (1) This is AC coupled to the clock input of a CMOS 4013
HS>>  D-Type flip flop. Potential divider R1 and R2 hold the clock input
HS>>  just below its switching point of 6V DC. Any signal from C1 exceeding
HS>>  apx 2.5V p-p will clock the circuit correctly. In practice any output
HS>>  from 3.3V to 12V logic, or an input from 5 to 50mW from a 50 ohm
HS>>  source can be used"
HS>> 
HS>>  I  believe my U3S built without any of the output driver stage has not
HS>>  enough  output from the square waves from the CLK0 pin, what do I need
HS>>  to  do  to up it to drive the amp suitably please? I don't really want
HS>>  to  add  the  driver  stage as i use it "as is" for my own LF passion,
HS>>  driving a 1kW W1VD Class d amp directly from CLK0. Thanks.
HS>> 
HS>>  http://www.g0mrf.com/630m.htm  is the link to the MF amp
HS>> 
HS>>  http://www.w1vd.com/137-500-KWTX.html   is  the  link  to the LF amp i
HS>>  currently drive direct from CLK0
HS>> 
HS>> 
HS>> 
HS>>  --
HS>> 
HS>>   2E0ILY
HS>>  Best regards,
HS>>   Chris                            mailto:chris@...
HS>> 
HS>> 
HS>> 
HS>>  --
HS>>  Best regards, Chris Wilson (2E0ILY)
HS>> 
HS>> 
HS>> 
HS>> 
HS>>
HS>
HS>
HS>
HS> --
HS> Best regards, Chris Wilson (2E0ILY)
HS>
HS>
HS>
HS>
HS>



--
Best regards, Chris Wilson (2E0ILY)

Re: Hamvention 2019

jjpurdum
 

Nope...it's me. I find myself being bent over more and more with age, with the result that more and more things are going over my head and the gray matter just isn't getting them as much as it used to!

Jack, W8TEE

On Thursday, May 2, 2019, 4:14:07 AM EDT, gerrykav via Groups.Io <gerrykav@...> wrote:


Jack
I was jokingly suggesting that there might be a new product announcement.
I guess I missed that mark with my rubbish humour.
/ Gerry

Re: Hamvention 2019

J68HZ
 

Will it be bolted to the table?


Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ

 

Owner - Operator

Big Signal Ranch – K9ZC

Staunton, Illinois

 

Owner – Operator

Villa Grand Piton - J68HZ

Soufriere, St. Lucia W.I.

Rent it: www.VillaGrandPiton.com


email:  bill@...

 


On May 2, 2019, at 8:04 AM, Hans Summers <hans.summers@...> wrote:

Hi Dave

Yes, I will bring a prototype. 

73 Hans G0UPL

On Thu, May 2, 2019 at 1:41 PM David Wilcox via Groups.Io <Djwilcox01=yahoo.com@groups.io> wrote:
Will we be able to SEE a QSX, maybe touch it?

Dave K8WPE

David J. Wilcox K8WPE’s iPad

On May 2, 2019, at 4:32 AM, Hans Summers <hans.summers@...> wrote:

Hi Gerry
 
I was jokingly suggesting that there might be a new product announcement.

I got that... but there isn't, sorry... just the existing products!

73 Hans G0UPL

Re: Hamvention 2019

Hans Summers
 

Hi Dave

Yes, I will bring a prototype. 

73 Hans G0UPL

On Thu, May 2, 2019 at 1:41 PM David Wilcox via Groups.Io <Djwilcox01=yahoo.com@groups.io> wrote:
Will we be able to SEE a QSX, maybe touch it?

Dave K8WPE

David J. Wilcox K8WPE’s iPad

On May 2, 2019, at 4:32 AM, Hans Summers <hans.summers@...> wrote:

Hi Gerry
 
I was jokingly suggesting that there might be a new product announcement.

I got that... but there isn't, sorry... just the existing products!

73 Hans G0UPL

Re: Hamvention 2019

David Wilcox
 

Will we be able to SEE a QSX, maybe touch it?

Dave K8WPE

David J. Wilcox K8WPE’s iPad

On May 2, 2019, at 4:32 AM, Hans Summers <hans.summers@...> wrote:

Hi Gerry
 
I was jokingly suggesting that there might be a new product announcement.

I got that... but there isn't, sorry... just the existing products!

73 Hans G0UPL

Re: Hamvention 2019

David Wilcox
 

Hans,

Never fear. We will FIND you no matter where they put you.

Dave K8WPE

David J. Wilcox K8WPE’s iPad

On May 1, 2019, at 3:06 PM, jjpurdum via Groups.Io <jjpurdum@...> wrote:

Glad you'll make it! Also, next time check flights into Cincinnati and Columbus, as those are almost always cheaper than Dayton.

Jack, W8TEE

On Wednesday, May 1, 2019, 2:01:39 PM EDT, Fred Piering <fpiering@...> wrote:


Hi Jack:
Can't wait! In fact, if it wasn't for FDIM. I probably wouldn't come to Dayton. It was easy for the 15 years or so I lived in Ft, Wayne, but now, living in Florida, the Plane fare and Hotel take the place of a new transceiver.
I am looking forward to meeting you face to face also, as well as Hans.
73
Fred WD9HNU


On 5/1/2019 12:04 PM, jjpurdum via Groups.Io wrote:
What do you mean: It means nothing? Hans is speaking at FDIM and we're getting together after our talks, so I know he's going to be there.

Jack, W8TEE

On Wednesday, May 1, 2019, 11:37:18 AM EDT, gerrykav via Groups.Io <gerrykav@...> wrote:


Just saw this in the 2019 vendor list...


I'm sure it means nothing though.
/ Gerry

Re: Hamvention 2019

Steve AE8AT
 

Dayton native here. Look for me at FDIM and Hamvention!

At the risk of getting overwhelmed, feel free to contact me if anyone here has questions on food & drink in the area, running/biking trails, or other such things. As for Hamvention, I'm supporting the signage team, so I don't know much about anything else. 

Weather, it's been raining a ton so we think we have just about drained the clouds completely and are hoping for a dry Hamvention. 🙃

73
Steve
AE8AT

Re: Amplify U3S CLK0 output to drive this MF amp question?

Hans Summers
 

Hi Chris

Yes I WILL be able to fix it... but at the moment there are hoards of people waiting for QSX so I am trying to prioritize on that... 

73 Hans G0UPL

On Tue, Apr 30, 2019 at 4:17 PM Chris Wilson <chris@...> wrote:
Hello Hans,

 Monday, April 29, 2019

 I was going on the Si5351A data sheet that I read as saying the CLK
 outputs are 0.6V, I am now hoping I am being thick or
 misunderstanding it! Thank you Hans :)

Will you ever be able to have a look at the U3S issue with Iv option
please? I have a feeling what's happening is for whatever reason CLK1
*IS NOT* having the Park mode reliably disabled when Iv is set to 1.
So an output is always apparent on CLK1, which is not what's needed. I
think this is apparent wit X2 on and off. Probably only Hans can delve
that deep! But if anyone feels like `scoping CLK0 and CLK1 with Iv set
to 1 and X2 on and off I'd sure appreciate confirmation of what I am
seeing here. Thanks.


Best regards,
 Chris    2E0ILY       mailto:chris@...


HS> Hi Chris


HS> Why can't it drive it directly? Your quoted text says anything
HS> over 2.5V pk-pk and later says that includes any 3.3V system
HS> (logical). The Clk0 output should be at least 3.3V pk-pk since the
HS> QRP Labs Synth kits are normally set up a bit on the higher side
HS> of the nominal voltage e.g. 3.5V.


HS> 73 Hans G0UPL 
HS> http://qrp-labs.com 
HS> On Mon, Apr 29, 2019, 14:43 Chris Wilson <chris@...> wrote:

HS> Chris Wilson 29 April 2019
HS> 
HS> 
HS>  A  friend  is  wanting  to get onto MF but has a tiny garden, so I am
HS>  allowing him to work portable from my fairly large site and aerial. He
HS>  will  use my U3S to drive a G0MRF 300W MF Class D amp. The build notes
HS>  say this:
HS> 
HS>  "A signal at twice the desired frequency is applied to the input
HS>  connector. (1) This is AC coupled to the clock input of a CMOS 4013
HS>  D-Type flip flop. Potential divider R1 and R2 hold the clock input
HS>  just below its switching point of 6V DC. Any signal from C1 exceeding
HS>  apx 2.5V p-p will clock the circuit correctly. In practice any output
HS>  from 3.3V to 12V logic, or an input from 5 to 50mW from a 50 ohm
HS>  source can be used"
HS> 
HS>  I  believe my U3S built without any of the output driver stage has not
HS>  enough  output from the square waves from the CLK0 pin, what do I need
HS>  to  do  to up it to drive the amp suitably please? I don't really want
HS>  to  add  the  driver  stage as i use it "as is" for my own LF passion,
HS>  driving a 1kW W1VD Class d amp directly from CLK0. Thanks.
HS> 
HS>  http://www.g0mrf.com/630m.htm  is the link to the MF amp
HS> 
HS>  http://www.w1vd.com/137-500-KWTX.html   is  the  link  to the LF amp i
HS>  currently drive direct from CLK0
HS> 
HS> 
HS> 
HS>  --
HS> 
HS>   2E0ILY
HS>  Best regards,
HS>   Chris                            mailto:chris@...
HS> 
HS> 
HS> 
HS>  --
HS>  Best regards, Chris Wilson (2E0ILY)
HS> 
HS> 
HS> 
HS> 
HS>



--
Best regards, Chris Wilson (2E0ILY)



Re: Hamvention 2019

Hans Summers
 

Hi Gerry
 
I was jokingly suggesting that there might be a new product announcement.

I got that... but there isn't, sorry... just the existing products!

73 Hans G0UPL

Re: Hamvention 2019

gerrykav <gerrykav@...>
 

Jack
I was jokingly suggesting that there might be a new product announcement.
I guess I missed that mark with my rubbish humour.
/ Gerry

Re: QCX Party #chat

DG2FDD
 

Hi to all,

I'd like to inform you that I placed a short news notice about the QCX-QSO-Party in the CQ-DL, the German monthly hamradio magazine. Maybe that attracts some more operators to join in next month.

73 de Jens

Re: 27MHz instead of 7MHz at inputs to IC3 #problem

Alan G4ZFQ
 

On transmit, 27MHz squarewave appears at pins 4 and 10 of IC3.  (Should be ~7MHz squarewave, as observed on another QCX built by a relative.)
Bill,

What method are you using to see this squarewave?
Is it the expected 3.3V peak to peak?
Is it a stable frequency?
27MHz exactly?
Can you alter the frequency?

73 Alan G4ZFQ

This suggests that IC1 isn't being programmed to output 7MHz signals.
What I've done so far:
-- Visually inspected IC1 pins for possible shorts (for the second time; also did that before the board was assembled).  None found.
-- Visually insected IC2 (microprocessor) socket joints.  All look good.
-- Removed and reseated IC2.  Didn't fix the problem.
-- Visually inspected traces on board bottom from IC2 socket to IC1.  No problems found.
-- Performed a system reset.  Didn't fix the problem.
-- Verified continuity between IC2 pins 27 and 28 to IC1 pins 4 and 5.
-- Verified that R3 and R4 are 1K.
-- Verified that voltage at output of D1 is 3.3V.

Re: Five circumnavigations?! #wspr

HF
 

It's heading home!  Will it cross the 79.4 W longitude line any closer to its launch site than U3B-14 did?  I noticed that this one lingered around Hawai'i during laps 4 and 5...is it trying to suggest a southern launch spot for U3B-27?  Dave, I'd love to help; I'll be going there in a month or so.  -Halden VE7UTS

Re: 27MHz instead of 7MHz at inputs to IC3 #problem

Shirley Dulcey KE1L
 

27 MHz suggests a different problem - a short on the board that is
causing the Si5351A reference oscillator signal to show up at IC3.

On Wed, May 1, 2019 at 6:09 PM James Daldry W4JED <@jimdaldry> wrote:

Hi, Bill

Before I did anything rash, I would do a full reset and then set it up for 7 mhz.

73

Jim W4JED

On 5/1/19 12:19 PM, Bill Creitz wrote:

40m QCX build completed in early April 2019.
Firmware: T1.00g

Initial symptom: no RF output.

Started troubleshooting at TRANSMIT signal path. Soon found...

On transmit, 27MHz squarewave appears at pins 4 and 10 of IC3. (Should be ~7MHz squarewave, as observed on another QCX built by a relative.) This suggests that IC1 isn't being programmed to output 7MHz signals.

What I've done so far:
-- Visually inspected IC1 pins for possible shorts (for the second time; also did that before the board was assembled). None found.
-- Visually insected IC2 (microprocessor) socket joints. All look good.
-- Removed and reseated IC2. Didn't fix the problem.
-- Visually inspected traces on board bottom from IC2 socket to IC1. No problems found.
-- Performed a system reset. Didn't fix the problem.
-- Verified continuity between IC2 pins 27 and 28 to IC1 pins 4 and 5.
-- Verified that R3 and R4 are 1K.
-- Verified that voltage at output of D1 is 3.3V.

I'm out of ideas. Any further suggestions would be greatly appreciated.

Bill
in Maryland

Re: QCX future?

Shirley Dulcey KE1L
 

There are a few issues with a QCX on 2m.

First, as somebody mentioned, the analog switches in the front end won't work well on that band. People have tried them on 6 with modest success, but 2 is another matter.

Second, I don't know if the method that the QCX uses to generate quadrature clocks will work at that frequency. The divider that is used in the Softrock also won't work in combination with an Si5351A; the LO would have to operate up to 600 MHz for that.

Third, the receiver noise figure, even if the mixer works, is far too high for the quiet 2m band. You would really want a low noise preamp.

Another issue is whether the output transistors can produce adequate output.

But perhaps hardest of all is that the FCC spectral purity requirements are more stringent on the VHF and UHF bands. A 2m QCX will require a better low pass (or band pass) filter, and making a design that can be built by kit builders and aligned without expensive test gear will be a challenge.

All in all it adds up to it being a new design. I wouldn't mind seeing Hans do it someday... but please let him finish the QSX first!


On Wed, May 1, 2019, 8:54 PM Kelly Jack <kellyjack1968@...> wrote:
On Thu, May 2, 2019 at 08:13 AM, Nick VK4PP wrote:
Just wondering, could the QCX do 2m? with the correct adjustments?

I have a local ham interested in CW, but lives in an apartment...

So very space limited for antenna, might be able to do a 6m or 10m  1/4 wave.... or vert dipole...

Thoughts?
73 Nick VK4PP

 Nothing definitive from me but I think tx is doable with lpf and tx inductor change and probably need pa transistor change to get more power out.

Receive issues include not enough gain in the front end and a query on whether the fst3253 will switch fast enough for vhf. Bpf change also.

There are other antenna options like mag loop if antenna size is the issue. Also not sure there is much cw action on 2 or 6 at least in vk. I have a mag loop that fits in the house that tunes to 40m and one of the online calculators says its 12% efficient or 1.5 s points down  (better on higher bands) but manually tuning it is time consuming and it works much better outside the house based on wspr tests. I think this is going to be true though of any antenna. Maybe its more of an antenna options issue than a band issue particularly if they are interested in getting on a band where there is some cw activity as opposed to vhf specifically.

73
Simon
VK3ELH