Date   

Re: Select Button on Alignment QCX+ 20m

N3MNT
 

Could be a simple issue.  Make sure you did not install the know too far on the shaft ( close to the case) or it will not have sufficient travel to activate the switch.


Skeeter Hunt 2020 Results published.

Larry Makoski
 

To all Skeeters and Skeeter Hunters,

You are ALL chmapions in my book! Thank you all for participating - without you, this event is a big ZERO. You folks make it what it is. And while you're tops, special kudos go to:

Gene N5GW - 1st Place overall with 25,912 points
Kent as N0SS - 2nd Place overall with 21,316 points
Dave AB9CA - 3rd Place overall with 17. 806 points
Peter NN9K - 4th Place overall with 16,381 points
Marc W4MPS - 5th Place overall with 14.020 points

The 2020 Skeeter Scoreboard is available for viewing in its entirety at:

https://drive.google.com/file/d/18QkjuDoQik9OYXQeC19l4kUPCyAgYcQU/view?usp=sharing

The soapbox will follow ASAP as well as certificates to those who earned them.

Thanks again to all who particpated and and to those who sent in log summaries, comments and photos.

73 de Larry W2LJ - Skeeter Hunt Contest Manager - Skeeter # 13 in perpetuity.


Re: Thoughts on Low Power and fewer turns on LP filter toroids

@CurtisM
 

Phil

the 5 watt outside is specified for higher voltage than 13.8 volts.  okay a few claim more, but I trust the designer's data. 

your rigs are working wonderfully 3 watts to 5 watts is a small fraction of one S-unit !  only your power meter knows the difference. 

okay to tweak a rig when building - otherwise we may as well order it already built (funny thing, that option is coming!). 

all seems well - enjoy its radiations - wow these QCX have wonderful receivers! 

73 Curt


Re: QCX #smoked ? #smoked

@CurtisM
 

John

let's not conclude anything yet - but suffice it to say WSPR can be rough on this rig - the original QCX without any heat sinking on the bs170 finals.  I can't speak to the qcx+ on WSPR, but the heatsink at least looks nice! 

let's see - single band rig - if you do WSPR once each 10 minutes - I would think it should work if your antenna has a reasonable match.  kaput?  I would think only the bs170 finals take punishment - order a batch of them from W8DIZ if you are stateside. 

now i did smoke some bs170 in my QCX - when I plugged in GPS and did not realize it set rig into transmit.  hang in there I hope the QCX is still okay. 

73 curt


Re: DSB & AM on 222MHz with IQ receiver, can it be done? #building #vhf #si5351a #fst3253 #1.25M #fst3253 #ht #building #vhf #si5351a

freefuel@...
 

Not exactly the direction I was looking to turn, but this seems to have some merit, https://www.rtl-sdr.com/rpitx-v2-released-easily-record-and-replay-with-rtl-sdr-and-a-raspberry-pi/

-Justin N2TOH 


Re: #40m qcx+ #40m

Don Blachura
 

Tu Ron. At 83 my mind is getting a little rusty.
Tu agn.

Don...w2xb


Re: #40m qcx+ #40m

Ronald Taylor
 

 Page 138 in the manual... Kenwood TS-480


4.28 CAT Control commands (PC remote operation)

The CAT command system is intended to allow the QCX+ to be used with logging software (general and contest) which uses CAT control commands to query the transceiver for information entered into the log, typically operating frequency, mode etc. A subset of the Kenwood TS-480 command set is implemented, with a few minor modifications.



page138image28583472

QCX+ assembly Rev 1.03                                                                                                           138


On Tue, Sep 8, 2020 at 1:30 PM Don Blachura via groups.io <haircutter=verizon.net@groups.io> wrote:
Need a liitle help. What rig do you select in logging software to use the "cat' on the qcx+?
I see the port in my Device manager, but from there I am lost.

Don...w2xb
(using aclog by n3jfp)


#40m qcx+ #40m

Don Blachura
 

Need a liitle help. What rig do you select in logging software to use the "cat' on the qcx+?
I see the port in my Device manager, but from there I am lost.

Don...w2xb
(using aclog by n3jfp)


Re: QCX #smoked ? #smoked

Shirley Dulcey KE1L
 

Most of the "12V" power supplies sold to hams are really 13.8V supplies out of the box. (Many of them can be adjusted with an internal trimmer.) A lot of ham gear is designed to operate best at that voltage, which is about what you get from a typical automobile while it is running. The power supply is probably working as designed.


On Tue, Sep 8, 2020 at 3:59 PM John Sharman via groups.io <jsharman6=sky.com@groups.io> wrote:
Finals are ok !


On 8 Sep 2020, at 20:45, ajparent1/KB1GMX <kb1gmx@...> wrote:

Define kaput,  and what item?

Likely fried the finals in the morning and during the day repeated tries finished the job.
THe PS I can only guess about.

Allison
-------------------------------
Please reply on list so we can share.
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Re: QCX #smoked ? #smoked

John Sharman
 

Finals are ok !


On 8 Sep 2020, at 20:45, ajparent1/KB1GMX <kb1gmx@...> wrote:

Define kaput,  and what item?

Likely fried the finals in the morning and during the day repeated tries finished the job.
THe PS I can only guess about.

Allison
-------------------------------
Please reply on list so we can share.
No private email, it goes to a bit bucket due address harvesting


Re: Thoughts on Low Power and fewer turns on LP filter toroids

Hans Summers
 

Hi all

This problem has always come up at intervals on this group. 

It used to be that we could blame suspect capacitors for being lossy since several were found on occasion. 

Not any more! All capacitors are now NP0 ceramics manufactured by Vishay and procured from Digikey. All the toroids are from Diz @ kitsandparts.com. I don't think it at all likely that there are any quality issues with these US sourced parts. 

Which leads us just back to variations in component tolerances, winding styles, soldering (check grounded pins of capacitors which are harder to get soldered well to the groundplane!). And variations and errors in power measurement. All these variations are the most likely cause all along on most previous occasions too... but for sure the capacitors and toroids in the LPFs are really always good now. 

73 Hans G0UPL 

On Tue, Sep 8, 2020, 21:44 Michael.2E0IHW via groups.io <blumu=btinternet.com@groups.io> wrote:
Apart from soldering issues, this must be  the most confounding disincentive  for faint-hearted wonnabe QSX+ers ...

There must surely be a concise winding-checklist for genuine radio "amateurs" ?

Michael 2E0IHW
...........................................................

On 08/09/2020 17:57, Phil/K3UT (ex W3HZZ) wrote:
I've completed a 20M QCX+ and have just fixed a friend's 30M QCX+. Both are working nicely, but at 13.1 volts I get about 3watts output on both, using the onboard RF tool to measure (and less on my Elecraft wattmeter). 

To achieve that output, I had to take two turns off L1 and L3 and one turn off of L2 and fiddle around a little with the spacing of the windings. I did that with both radios.

Any thoughts why the number of turns differs so greatly from that specified in the build instructions? Both kits were shipped about the same time. Could it be a quality control issue of the toroids? I measured the toroids on the 20M version before I installed them, and they were spot on before I took the turns off. I didn't measure them after the turns had been removed.

I'm satisfied with the power output of the units.  Just curious why they aren't meeting the specs as stated in the manual?

Phil, K3UT


Re: QCX #smoked ? #smoked

ajparent1/KB1GMX
 

Define kaput,  and what item?

Likely fried the finals in the morning and during the day repeated tries finished the job.
THe PS I can only guess about.

Allison
-------------------------------
Please reply on list so we can share.
No private email, it goes to a bit bucket due address harvesting


Re: Thoughts on Low Power and fewer turns on LP filter toroids

Michael.2E0IHW
 

Apart from soldering issues, this must be  the most confounding disincentive  for faint-hearted wonnabe QSX+ers ...

There must surely be a concise winding-checklist for genuine radio "amateurs" ?

Michael 2E0IHW
...........................................................

On 08/09/2020 17:57, Phil/K3UT (ex W3HZZ) wrote:
I've completed a 20M QCX+ and have just fixed a friend's 30M QCX+. Both are working nicely, but at 13.1 volts I get about 3watts output on both, using the onboard RF tool to measure (and less on my Elecraft wattmeter). 

To achieve that output, I had to take two turns off L1 and L3 and one turn off of L2 and fiddle around a little with the spacing of the windings. I did that with both radios.

Any thoughts why the number of turns differs so greatly from that specified in the build instructions? Both kits were shipped about the same time. Could it be a quality control issue of the toroids? I measured the toroids on the 20M version before I installed them, and they were spot on before I took the turns off. I didn't measure them after the turns had been removed.

I'm satisfied with the power output of the units.  Just curious why they aren't meeting the specs as stated in the manual?

Phil, K3UT


Re: #u3s QCXPTXCO install #u3s

Dean Smith
 

just been playing with the 25mhz tcxo for q"C"x+ in a U3s.
QRSS is good to 2 meters! a little drift to start due to other components, BS170's ect, then it settles down nicely!
Much better than the fox type tcxo i tried in the past.
Something strange happens to the height of FSK at around 6M it seems to double in height?? maybe me...
Been playing WSPR on 30m with it, and all seems ok. No drift and consistant frequency reports.
i wonder if this TCXO will fit on the Pads on the later revision Si5351a board? would look a lot tidier.
Be nice if you could buy the TCXO on it's own and solder up, or ready tacked to the board?
Certainly a lot less scary than the OXCO option, for those with less experience.
impressed with the results.
Got 10m decoding with my own system on wspr. just wonder how far we can go :)
Dean (G7EOB)


Re: Thoughts on Low Power and fewer turns on LP filter toroids

Arv Evans
 

In addition to Allison's comments, the filters are designed 
to work with 50 ohms input impedance and 50 ohms output 
impedance.  If either of those impedances are not 50 ohms 
the filter cutoff frequency will be impacted.

Arv
_._


On Tue, Sep 8, 2020 at 11:29 AM ajparent1/KB1GMX <kb1gmx@...> wrote:
Phil,

THe AL used for winding of toroids has a variation of 10-15% so depending on
how tightly wound  plus individual batches you get variation.

The Iron powder material is really like many high volume materials to get it
as close as they tend to be takes a significant bit of effort.  I strongly point
to the spec.


Add to that the caps used are 10% maybe 5% so when you plug in the variation 
it does get to be significant.  That said I'se used those very same table and
many over a 25 filters then tested them ( 5 bands * 5 per) and then tested
them and they were remarkably consistent.  Parts used were not the same
batches but were drawn from my own stocks some quite old.

Also did you adjust L4?

All 4 of those inductors interact and due to reflected impedances and determine
power and harmonic content.

Allison
------------------------------
Please reply on list so we can share.
No private email, it goes to a bit bucket due address harvesting


QCX #smoked ? #smoked

John Sharman
 

All working well on WSPR for weeks
This morning the display is acting weird and the buttons are sometimes not responsive
This afternoon the display stats flashing on and off with smell of burins from transceiver!!
Hope its just the 5Reg thats blown!
The power supply i'm using is 12v from RS Components ad is giving out 13.8v
Is the consensus that the item is Kaput!!!!
Regards
John


Re: QRP-LABS Low Pass Filter upgrade

ajparent1/KB1GMX
 

Also PCB conductor size and spacing are a factor as well.

For example 100W is 1.4A into 50 ohms so heavier and larger
relays become a factor.

20W is easy 50W takes care, more is significant revision.

Allison
-------------------------------
Please reply on list so we can share.
No private email, it goes to a bit bucket due address harvesting


Re: Thoughts on Low Power and fewer turns on LP filter toroids

ajparent1/KB1GMX
 

Phil,

THe AL used for winding of toroids has a variation of 10-15% so depending on
how tightly wound  plus individual batches you get variation.

The Iron powder material is really like many high volume materials to get it
as close as they tend to be takes a significant bit of effort.  I strongly point
to the spec.


Add to that the caps used are 10% maybe 5% so when you plug in the variation 
it does get to be significant.  That said I'se used those very same table and
many over a 25 filters then tested them ( 5 bands * 5 per) and then tested
them and they were remarkably consistent.  Parts used were not the same
batches but were drawn from my own stocks some quite old.

Also did you adjust L4?

All 4 of those inductors interact and due to reflected impedances and determine
power and harmonic content.

Allison
------------------------------
Please reply on list so we can share.
No private email, it goes to a bit bucket due address harvesting


Re: QCX+ T1 Toroid Wire Length? #20m #qcx+ #20m #toroid

Bob Ballard
 

Len,

 

Attached above is my input regarding an “antenna tuner” question asked last week.

 

73,

Bob – KG5SQJ

 

From: QRPLabs@groups.io <QRPLabs@groups.io> On Behalf Of Len W1LEN
Sent: Tuesday, September 8, 2020 10:46 AM
To: QRPLabs@groups.io
Subject: Re: [QRPLabs] QCX+ T1 Toroid Wire Length? #20m #qcx+ #toroid

 

Hi, what is the gauge of the magnet wire supplied with the QCX+ kit for the toroids and transformer?  Also, is there a particular antenna tuner or tuners that have been found to be most useful with the 50 watt linear amplifier?  
Thanks very much, 
Len W1LEN


Thoughts on Low Power and fewer turns on LP filter toroids

Phil/K3UT
 

I've completed a 20M QCX+ and have just fixed a friend's 30M QCX+. Both are working nicely, but at 13.1 volts I get about 3watts output on both, using the onboard RF tool to measure (and less on my Elecraft wattmeter). 

To achieve that output, I had to take two turns off L1 and L3 and one turn off of L2 and fiddle around a little with the spacing of the windings. I did that with both radios.

Any thoughts why the number of turns differs so greatly from that specified in the build instructions? Both kits were shipped about the same time. Could it be a quality control issue of the toroids? I measured the toroids on the 20M version before I installed them, and they were spot on before I took the turns off. I didn't measure them after the turns had been removed.

I'm satisfied with the power output of the units.  Just curious why they aren't meeting the specs as stated in the manual?

Phil, K3UT

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