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Re: #u3s QCXPTXCO install #u3s

Dean Smith
 

And here is what happened using 27Mhz Fox TCXO with QRSS over various frequencies...
https://sites.google.com/site/g7eob1/radio/ultimate/si5351a-jitter


Re: #u3s QCXPTXCO install #u3s

Dean Smith
 

Hi,Brian , Ken,Dave et all,
I'm just waiting for my TCXO to show up, to do exactly the same.
From what i was informed by Hans it would work ok, but don't expect much at 144mhz.
Ive used previous tcxo's by fox without any success through jitter. Hopefully these will shine!!
I love the pics BrianB... perfect!
Dean (G7EOB)


Re: u.fl / IPX connector on U3S #u3s #wspr

Allan Nelsson
 

One thing is the Wifi power levels and frequency but at HF things are more relaxed. I don't think that use of U.FL connectors for a couple of Watts should be a problem. The RFzero that also uses a Si5351A has the option to install U.FL connectors: https://www.rfzero.net/documentation/hardware/modifications/#dual_rf_output

However, as you already know, these connectors are only intended for fixed connections and not advisable to use. A much better solution would be e.g. SMA. 

73, Allan OZ5XN


Re: QRP Guys Trap Antenna

Klaus Beckers
 

Don't forget a bigger toroid core size that will not be so quickly saturated than the small cores of the original circuitry. Your traps would no longer work properly with saturated cores and shorted capacitors.


Re: QRP Guys Trap Antenna

Dave N3AC
 

Paul K2DB,

I didn't analyze the circuit, but since it's a tank circuit, I'd think your capacitor voltage rating or wire diameter will limit your power level... unless you want to conduct a "smoke test" and tell us! Good luck!

Dave N3AC

On Fri, Sep 4, 2020 at 11:35 AM K2DB Paul Mackanos <paul.mackanos@...> wrote:
It says it’s rated for 20 W. I’m just wondering if it will take the 50 W output of the QCX Amp. If not what is the best for beefing up the parts to handle it. 😎
I plan on using it only in the CW mode, normally 25 to 35 words per minute.


Re: GQRP Convention Online this weekend (reminder)

HL Serra
 

Very elegant stand, Lex. Nice work. 
Q: What is the angle of the stand's elevation of the unit? 
For my QCX+ I measured/guessed ~30degrees, but it could be a little more or less. I have sent all the dimensions and info to Pete G0PNM to see if he can make a prototype plastic stand that will work ergonomically for the QCX+.
Cheers, and 73, Larry N6NC


QRP Guys Trap Antenna

K2DB Paul Mackanos
 

It says it’s rated for 20 W. I’m just wondering if it will take the 50 W output of the QCX Amp. If not what is the best for beefing up the parts to handle it. 😎
I plan on using it only in the CW mode, normally 25 to 35 words per minute.


Re: #u3s QCXPTXCO install #u3s

KEN G4APB
 

Hi Brian,
the tcxo is listed as 25Mhz, not 27Mhz, so did you just change the reference frequency in the menu list? I thought 27Mhz was chosen to get the WSPR tones correct. I would be interested to know what is the highest band and mode you have this working on please?


73 Ken G4APB


WARNING -- Promotional material

jjpurdum
 

All:

A number of things:

1. I have gone through the entire book and reformatted all of the source code listings. I also increased the font size used in the listing by 25% so even us old people can read it more easily. As a result, the new version of the book is approximately 50 pages longer than before. Although the cost of the book has increased because of the higher page count, there's no reason for you to pay more because of my mistake. The price remains the same for both the printed and eBook versions. Amazon tells me that the new version of the book will be available on orders on and after Monday, Sept 7, 2020.

2. I have removed the index from the printed book. The reason is because my index numbers do not exactly match their printed version. However, the 850+ index entries help to make the book useful, so I am ordering printed copies and will re-paginate the index after I have received a copy of the new book. I will then post the new index on the SoftwareControlloredHamRadio (SCHR) site when it is done. You can then download the index and use it with the printed book. (I would think eBook users would also find it useful when used in conjunction with the Kindle word search facility.) I will send out a notice when the index is done, but only to members of the SCHR group. That will lessen the bandwidth that the message takes.

3. All of the Exercises are also complete for all chapters. They, too, can now be downloaded from the SCHR site. Please: Try to answer the questions before looking at my answer, for several reasons: 1) testing yourself as you read through the book is the only way to accurately assess how you are progressing, 2) it's good practice for you to select data types and make up variable names, 3) if you have trouble answering a question, it tells you that you should review that aspect of the text, and 4) you could end up with a better answer than I give! Finally, there are a couple of Exercises where I don't give any answer because I really want you to answer them yourself.

I appreciate that I am intruding on members of other groups who could care less about this topic, and I hope that the tag line helps them avoid it. However, I cannot see any other way to inform interested members of the changes. I will only be using SCHR from now on for notices.

Thanks for your forebearance!

Jack, W8TEE


Re: #40m #40m

Daniel Curtin KF4AV
 

If it were disconnected a jumper wire to the trace will restore function. My QCX 40 has run perfectly for months with a jumper on my T1. I had two of the leads in the wrong holes!


Re: QRP-Labs filter adapter for NanoVNA

Bill Cromwell
 

Hi Curt,

When I look at all the discussions of the fussy work building adapters for the NanoVNA it is easy for feelings of unease over my own methods to start creeping in. I have to apply a dose of pragmatism - I'm a forty meter ham. Those folks are pushing the envelope into microwaves for the NanoVNA and the TinySA. My hard limit is 17 meters. I do sometimes go higher but at 15 meters the rash starts and by the time I advance to ten meters it is the occasional nosebleed and ten meters has made much of my hair fall out <wink>.

That is not an excuse to be sloppy at HF and MF but it really is easier to keep the Genie in the bottle at DC.

73,

Bill KU8H

bark less - wag more

On 9/3/20 9:21 PM, wb8yyy via groups.io wrote:
while folk indeed have crafted very nice fixtures, I am likewise thinking for HF filters that coax with appropriate connectors to interface to qrp labs filters should work nicely. as most everything I wish to evaluate now is at HF, I will research my stash to find materials for simple interfaces.  we should remember that HF wavelengths are in meters, much larger than these filters.  73 curt


Re: #40m #40m

Don Blachura
 

TU guys

Don..w2xb


Re: #40m #40m

Ronald Taylor
 

That should be fine Don as long as the one on the bottom is intact. 

73....Ron

On Fri, Sep 4, 2020 at 04:08 Don Blachura via groups.io <haircutter=verizon.net@groups.io> wrote:

Desolderinmg on my T1 on my QCX+,the little solder pad (connection #2) came off on the 
component side. It's on one side but not the other. Should be ok?



Don...w2xb










Re: #40m #40m

Al Holt
 

If the remaining side connects to the rest of the circuit, it'll be fine. I think the unconnected pad was there mainly to allow for plating through the PCB hole. Just a guess though, it may also add stability to the 'active' side?

Just be sure when you finish up with the repair T1 connects to the other components it's supposed to.

Good luck!

--Al
WD4AH


#40m #40m

Don Blachura
 

Desolderinmg on my T1 on my QCX+,the little solder pad (connection #2) came off on the 
component side. It's on one side but not the other. Should be ok?

Don...w2xb


Re: GQRP Convention Online this weekend (reminder)

Ian VA7ITM
 

Thank you Trystan for the heads up. There's a lot of great content in the conference and I've signed up as a DX member. GBP 17 for full conference access, 18 months GQRP membership and 6 issues of SPRAT is a no brainer bargain.


Re: 3D printed stand for QCX+?

Lex PH2LB
 

Larry, I know what you mean. I'm experiance the same thing and had the same problem with my uBITX. 

So i made tiltting feet from polycarbonite for the uBITX. I know the uBITX is much bigger then the QCX+ but it could be a start for a new design for tiltting feet (available as a 3D design for 3D printing). Check out :  https://www.ph2lb.nl/blog/index.php?page=tiltingfeet

 


Re: GQRP Convention Online this weekend (reminder)

TONY G4WIF
 

Just to tempt you, the Convention agenda is on the top of the following page.
http://gqrp.com/convention.htm
please note that times are in UTC. It is a really good line-up.

Just below that link is another to an online timetable that gives example times in other zone and there is a link to choose your own zone.
[Just look for the "change cities" link]

Kind regards
Tony G4WIF


Re: QRP-Labs filter adapter for NanoVNA

Lex PH2LB
 

On Thu, Sep 3, 2020 at 08:16 PM, Christiaan PA3FUN wrote:
Any chance you will produce a version compatible with my NanoVNA-F? Distance between (the centre of) the two SMA jacks reads 4.2mm. 

Hello Christiaan, It's not hard for me to re-design the PCB for that but all will depend on the constant quality of the producers for the NanoVNA-F and the used connectors (edge connectors tent to be not installed exactly every time). So I'm curious about the internal construction of the NanoVNA-F I will contact you by e-mail. 

And off course bammi and curt are right. The usage of short cables isn't a problem especially appropriately calibrated. 

73 de Lex PH2LB 


Re: 3D printed stand for QCX+?

HL Serra
 

Thanks, Mike. I sent a request off to Pete G0PNM to see if he would fashion a new stand for the QCX+.
73, Larry N6NC