Date   
Re: OCXO/Si5351A Synth kit - The wandering minstrel... #ocxo

Hans Summers
 

Even I agree 100%. And I designed the thing :-/

73 Hans G0UPL

On Fri, Jul 26, 2019 at 8:39 PM Mike Berg <mikeberg@...> wrote:
"With a U3S, depending on your use perhaps over 95% will find the OCXO an unnecessary complication."

Agreed 100%. The stock synthesizer works great with my U3S.

73
Mike

Re: OCXO/Si5351A Synth kit - The wandering minstrel... #ocxo

Mike Berg
 

"With a U3S, depending on your use perhaps over 95% will find the OCXO an unnecessary complication."

Agreed 100%. The stock synthesizer works great with my U3S.

73
Mike

Re: qcx calibration

Alan G4ZFQ
 

i read somewhere that the gps receiver needs to be mounted some distance from the qcx or u3s.
Terry,

No reason apart from physical, many use the GPS in the same box as a U3.

Alan

WWV is not an absolute standard,
That really depends just how absolute you want to get. You usually need a very good standard to see any variation, except perhaps when propagation is borderline. Does it really matter if a U3 or QCX is a few tenths of a Hz out?

73 Alan G4ZFQ

Re: Plastic or metal case

Don DeGregori
 

In my house,
qrc> meow more - wag less
Just got email, QCX on the way, arrive in few days. Cleaning off work bench. Thanks people for all case ideas.

Don ... W6RWN

Re: Plastic or metal case

N6WKZ
 

Hi Ted,

I like those cases also, can you provide a "link" ?

73

Phil N6WKZ

On 7/26/2019 6:57 AM, Don--AE4DW wrote:
Hi Ted..those cases, and the workmanship, look great!

When you mention Chinese cases, am I correct to assume those are not the cases Hans sells, but a third party offering? I'm actually curious about the legs and where you sourced them. g

Re: qcx calibration

terryhugheskirkcudbrifght@...
 

hi
i have not ruled out the gps - i like the idea of using it to set up and then disconnect to keep the qcx / u3s portable

i agree there is much less hassle in calibrating using the gps

did you see my post about the maxwell mod to qcx - keeps it all in one box.

terry

Re: Plastic or metal case

Don--AE4DW
 

Hi Ted..those cases, and the workmanship, look great!

When you mention Chinese cases, am I correct to assume those are not the cases Hans sells, but a third party offering? I'm actually curious about the legs and where you sourced them. g

Re: qcx calibration

Alan de G1FXB
 

Hi Terry,
I would be interested in the reluctance to using the GPS calibration, it's good not to just follow the last person but share your reasons if you wish.
(Just, as another Alan says, Hans took the trouble to include set up routine in the firmware and it makes it so very easy.)
The GPS doesn't have to be connected full time, connected once at the time of initial alignment it gives you the correct baseline figures at that specific moment.
From then on if you minimise the changes to the U3S or QCX environment then the two reference xtals should remain stable for a number of days,
just behaves as any free running xtal osc.

If you have a known accurate source you could net both your TS520 and ubitx,
WWV is not an absolute standard, NIST gives a far end dependency within the range? of 10-7
ie:- when simply using a beat calibration method that's in the news at the moment it's in the order of 1hz @ 10MHz
Either U3S or QCX could be a benchtop source, and the accuracy figures Hans provided are:-
low numbers of hertz if left free running, with optional GPS discipline it will be sub
hertz level
(Something better than WWV for most tasks, sits on your bench, frequency agile so not limited to spot frequencies & assembled by yourself.....
Cost ?)


Nothing wrong with TS520's, I have a 830 that just keeps on going.....
You don't require the the PA the U3S provides, if you brought the closely related QRP-Labs VFO kit you could interface it to your TS520 the same way as the Trio / Kenwood 2nd VFO accessory they sold at the time.
Likely it will be more stable out of the box, the difference being that it could be optionally GPS locked in the 21st century.
So many choices.....


Alan

On 26/07/2019 12:35, Alan G4ZFQ wrote:
on the frequency - do you mean the wsjx display - i do not have an accurate frequency meter..

Terry,

That's where the GPS makes it easy.? Otherwise you really need to use a frequency standard, either RWM, WWV etc or get to know a WSPR user who is dead on frequency.
You set the U3 or QCX parameter so frequency is correct.


i have been reading both the qcx and u3s manuals but i am leaning towards the qcx cos its appears a bit less complicated than the u3s.? ie the u3s needs 5 v which would need a regulator to use my 12 v battery,

The regulator is simple, you could even get an Ebay module for a few pounds. I see a switch mode module for 99p inc. but linear is better where radio is concerned.
>
to equal the pa out it needs the 5 w pa.

That really depends, WSPR does very well with a lot less. 5W is often used but most times that is simply far more than required. I've never used more than 1W, my U3, purposely QRP, puts 50mW to the antenna on 10m and got to FY5KE a few weeks ago.
The U3 does get a little more complicated when you go multiband but it is very well documented and lots of experts here to put you right.

you may be interested that my exiting station has two transceivers - a vintage trio ts520se

There was someone recently using a TS520 for WSPR RX, I was surprised it worked, but it was borderline, it was not designed for less than 4Hz of drift in 2 minutes.

73 Alan G4ZFQ




Re: OCXO/Si5351A Synth kit - The wandering minstrel... #ocxo

Alan de G1FXB
 

Hi Mike,

If your wayward wandering minstrel is more U3S specific, than in your custom PIC project:-
http://qrp-labs.com/images/appnotes/AN001_A4.pdf
Has suggestions on what's known in that application


Alan

On 25/07/2019 20:50, Mike Berg wrote:
My previous method using the PIC involved setting the output to 10.000MHz connected to a relatively accurate frequency counter for monitoring purposes.
Then I ramped the oven temp up to about 40C for a place to start. The outter shield wasn't soldered yet and I had the thermistor taped to the outside of the oven above the crystal.
This was wrapped in foam for insulation in order to stabilize my readings.
I had a current meter in series to monitor the oven's state.
I tracked the freq shift down til it leveled out and my temp was showing abit under 45C.
I waited for everything to stabilize which took 20 min or so.
My PIC code has a calibrate function so I entered in the offset to make my counter show 10.000MHz.
Then I played with that while using a receiver to zero beat WWV, calibrating both the PIC and the counter in the process (for the moment, it's a $100 counter :)
I didn't notice the wayward drifting til I started using it in the U3S and racking up some hours.
I hope this clarifies things.
73
Mike?

Re: qcx calibration

terryhugheskirkcudbrifght@...
 

hi again alan

thanks for all the info

there seems to be a number of options for me
i have not forgotten the maxwell mod to the qcx to get it to rx as well as tx on wspr

my ubitx is doing a grand job in decoding wspr but the maxwell mod wiil put tx and rx into a nice compact unit

about the gps - i read somewhere that the gps receiver needs to be mounted some distance from the qcx or u3s. that would make the compact unit less compact ie less portable.

terry

Re: 5 Watt PA

M0RON
 

Forget that, I reread the original post and saw that you had installed them.
andy
--
The universe is made up of Protons, Neutrons, Electrons but contains only one M0RON.

5W PA

Vernon Matheson
 

Thanks to everyone for their input.

 

I did get one of them going last night. I retouched the connections for the 10 ohm mod and it sprang to life.

 

The other one is one that I built back in 2017 that never worked from day one and it is now a parts donor as I have screwed up a few traces desoldering and resoldering etc.

 

I will just buy another to replace it. I really like these little units. They really do well with the U3S.

 

Vernon

 

Re: QCX R36 Replacement Needed-Volume Control

James Daldry W4JED
 

Hi, Brian

After years of using Wsssh, Deoxid, Channel Master silicone, LubriClean, WD-40, and a host of other spray cleaners, I've found what works best on volume controls is a drop of automotive motor oil. It even works on cheap Chinese 10-for-a-buck volume controls, which have to be lubricated before first use, or they're noisy.

By the way, you use Wsssh with a Gozinta. It's a brass cylinder with a plunger, and a 3/8 inch i.d. tubular "business end. You pull the plunger back, put a few drops of Wsssh in the "business end, pull the knob off the control, and screw the tube onto the control threads. You then push the plunger in, blowing the cleaner past the shaft bearing and into the control. You clean the control without pulling the chassis out of the cabinet. Cool.

Jim W4JED

On 7/25/19 11:09 PM, Brian N7BKV wrote:
Yes, I used cleaner.  No joy.

Re: Odd problem with my QCX 40 #qcx

James Daldry W4JED
 

Hi, Peter

If you can't find component cooler, get a can of "canned air" from an office supply store. If you hold the can upside down you'll get liquid. Alternate between that and a hair dryer to "pin down" the problem.

Jim W4JED

On 7/25/19 5:39 PM, Peter GM0EUL wrote:
Hi Alan
Thanks, some very useful suggestions.  I will check the DC voltages and I like the idea of using an amplified speaker to trace the audio and see when it gets noisy.  The situation is complicated at the moment because now its got cooler the radio is working almost normally, I've just managed three qsos back to back with no issues, but its been unusable all day.  Heat must be a factor.  There is nothing particularly microphonic on the board, except R35 sometimes buzzes and whooshes when I touch its exposed end with my finger.  Might be worth changing that next, its the 750K resistor you mentioned and its an easy job if I can find something to replace it with.  

I haven't got any freeze spray but it would be useful thing to get.  

It needs to work for another half hour in the morning and I'll have made the 5 consecutive activity days!  Its been totally reliable up to now but then its never been this hot here before.

All the best

Peter, GM0EUL


 

 

Re: qcx calibration

Alan G4ZFQ
 

on the frequency - do you mean the wsjx display - i do not have an accurate frequency meter..
Terry,

That's where the GPS makes it easy. Otherwise you really need to use a frequency standard, either RWM, WWV etc or get to know a WSPR user who is dead on frequency.
You set the U3 or QCX parameter so frequency is correct.

i have been reading both the qcx and u3s manuals but i am leaning towards the qcx cos its appears a bit less complicated than the u3s.  ie the u3s needs 5 v which would need a regulator to use my 12 v battery,
The regulator is simple, you could even get an Ebay module for a few pounds. I see a switch mode module for 99p inc. but linear is better where radio is concerned.

to equal the pa out it needs the 5 w pa.
That really depends, WSPR does very well with a lot less. 5W is often used but most times that is simply far more than required. I've never used more than 1W, my U3, purposely QRP, puts 50mW to the antenna on 10m and got to FY5KE a few weeks ago.
The U3 does get a little more complicated when you go multiband but it is very well documented and lots of experts here to put you right.

you may be interested that my exiting station has two transceivers - a vintage trio ts520se
There was someone recently using a TS520 for WSPR RX, I was surprised it worked, but it was borderline, it was not designed for less than 4Hz of drift in 2 minutes.

73 Alan G4ZFQ

Re: My QCX40 .....

Hans Summers
 

Hi Curt

The 40m QCX is well capable of almost 5W at 12V supply and 6W at 13.8V. Steve's figures aren't far off what I measure. 

20m, requires a bit more help (higher supply voltage). 

73 Hans G0UPL

On Fri, Jul 26, 2019 at 2:25 PM wb8yyy via Groups.Io <wb8yyy=yahoo.com@groups.io> wrote:
Steve

Instead say this rig is way cool, and that cw is cool music. Grab what you remember and let rest drop to the floor.

Minor, but not likely you are getting 6w from a convetional 12 or 13.8 volt power supply. 3 watts is the norm, not a huge difference from 5w. Maybe I should keep you thinking this rig is the larger critter.  it rocks.

Curt

Re: My QCX40 .....

@CurtisM
 

Steve

Instead say this rig is way cool, and that cw is cool music. Grab what you remember and let rest drop to the floor.

Minor, but not likely you are getting 6w from a convetional 12 or 13.8 volt power supply. 3 watts is the norm, not a huge difference from 5w. Maybe I should keep you thinking this rig is the larger critter.  it rocks.

Curt

Re: My QCX40 .....

Hans Summers
 

Hi Steve

Many congratulations OM!

I have a lot of fun on mine in the odd spare hour early morning at the crack of dawn, or late night... when there is quiet and a stolen peaceful hour. 

Since Monday, I have been on 40m CW and worked New Zealand, US, Japan, Qatar, Israel, and ~20 countries all around Europe from Northern Finland to Cyprus and loads in between. Admittedly, not QRP... QCX-40 driving my junkbox 60W amp (2x IRF510 push-pull, run at 24V). VK, still elusive...

Have fun! 

73 Hans G0UPL

On Fri, Jul 26, 2019 at 2:12 PM Stephen Farthing G0XAR JO92ON97 <squirrox@...> wrote:
Dear all, 

Just to say my QCX40 is complete. I’ve measured an output power of a gnats nadger below 6 watts. The receiver seems plenty sensitive and selective. Now all I have to do is remember the code and get the nerve up to use the damned thing. 

I’ve another QCX 40 to make to try out my pal Guido’s SSB conversion and a QCX 20 still in the bag. 

Greetings from a thundery but cooler South Norfolk 

Steve G0XAR 

My QCX40 .....

Stephen Farthing G0XAR JO92ON97
 

Dear all, 

Just to say my QCX40 is complete. I’ve measured an output power of a gnats nadger below 6 watts. The receiver seems plenty sensitive and selective. Now all I have to do is remember the code and get the nerve up to use the damned thing. 

I’ve another QCX 40 to make to try out my pal Guido’s SSB conversion and a QCX 20 still in the bag. 

Greetings from a thundery but cooler South Norfolk 

Steve G0XAR 

Re: qcx calibration

terryhugheskirkcudbrifght@...
 

hi thanks alan
i am still pondering the qcx

ok on the clock - the manual says it will stay stable for a week (maybe the u3s manual)_ so to check it daily seems ok

on the frequency - do you mean the wsjx display - i do not have an accurate frequency meter..

i have been reading both the qcx and u3s manuals but i am leaning towards the qcx cos its appears a bit less complicated than the u3s.  ie the u3s needs 5 v which would need a regulator to use my 12 v battery, to equal the pa out it needs the 5 w pa. the advantage of the u3s is that it can multi band and also multi mode.

but both need the same calibration

you may be interested that my exiting station has two transceivers - a vintage trio ts520se and a ubitx. neither can be said to be accurately calibrated. my antenna are dipoles for 40 and 20 and a g5rv with atu mainly for use with 80 m.

my test equipment is fairly limited ie a scope, dummy load, a frequeny counter but only four sig decimal digits, a dvm,

i am currently looking for a project to keep my soldering iron busy and wspr may be the answer.

terry gm4dso