Date   

Re: Adapt A Bioenno 24v LiFePO4 Battery To Run The QRPLabs 50 Watt PA?

Shane Justice
 

Hi Allison,

All true- non FM CW/SSB is much kinder on battery. The radios I spoke of were SDRs with heavy processor use and FPGA use to encode/decode network waveforms.

We were using rubber duckie whips, but there was a company back in Mass. Somewhere who were developing body-loaded antennas. I once knew the cofounder, but I've lost track of him over the last 9 years or so.

I am sure I'd recall the company and/or the gentleman if I heard the names of the companies that were doing that work back then.

73,
Shane KE7TR


On Aug 11, 2020 at 15:44, ajparent1/KB1GMX <kb1gmx@...> wrote:

High draw is realated to battery size so for something useful at the 50W output
level 4A  is not a big draw.

Also for ham use 10% would be mostly sitting there... not brevity codes.
Large difference from how tactical radios are used.  That and no need
to carry M4 and 10 mags as part of the loadout.

I know as I developed antennas for mil gear and use 1/5 as worst case 
usage when power withstanding was close to the body or otherwise
loaded antenna.  Testing meant a PRC such often the batteries would
fail during a session meaning I'd carry several and maybe a spare for
the ham HT as backup [we were all hams] .

Typical planning for any case where a pile up or FD activity
plus calling CQ adds TX time loading.  The 20% used is still
light and  by actual measurement at club FD 35-45% was pretty
close to actual power consumed.  Usually battery heating is not
an issue nor high rates exceeding the C/5 and prefered for
operating time to be less than C/10.  

CW power consumption is about average considerably less than
100% more like 35% due to "spacing" elements when actually sending. 
SSB is maybe a bit more, even with processing less than 50%.  FM modes
tend to be big consumers.  Data depending on mode can hit 100% if that
is not a cooling limited situation for the radio.

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


Re: U3S Error: Si5351A

John AK4AT
 

Correction: The short trace that was open is on the lower side of the PCB.


Re: U3S Error: Si5351A

John AK4AT
 

I found a PCB manufacturing flaw. There was an open between pin 14 and R1 & Q1 on the PCB. This is a short trace on the upper side of the board, and despite filling the hole with solder, there was no contact between the pin and the components. I pried up the insulator on the connector strip pins, scratched away the coating on the trace and let solder flow across the pin, hole, and trace. Now I get a clock instead of an error, so I'm ready to proceed!

Thanks for the help!

John AK4AT


Re: Adapt A Bioenno 24v LiFePO4 Battery To Run The QRPLabs 50 Watt PA?

ajparent1/KB1GMX
 

High draw is realated to battery size so for something useful at the 50W output
level 4A  is not a big draw.

Also for ham use 10% would be mostly sitting there... not brevity codes.
Large difference from how tactical radios are used.  That and no need
to carry M4 and 10 mags as part of the loadout.

I know as I developed antennas for mil gear and use 1/5 as worst case 
usage when power withstanding was close to the body or otherwise
loaded antenna.  Testing meant a PRC such often the batteries would
fail during a session meaning I'd carry several and maybe a spare for
the ham HT as backup [we were all hams] .

Typical planning for any case where a pile up or FD activity
plus calling CQ adds TX time loading.  The 20% used is still
light and  by actual measurement at club FD 35-45% was pretty
close to actual power consumed.  Usually battery heating is not
an issue nor high rates exceeding the C/5 and prefered for
operating time to be less than C/10.  

CW power consumption is about average considerably less than
100% more like 35% due to "spacing" elements when actually sending. 
SSB is maybe a bit more, even with processing less than 50%.  FM modes
tend to be big consumers.  Data depending on mode can hit 100% if that
is not a cooling limited situation for the radio.

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


Re: Difficulty during alignment - RF output #20m #qcx #problem

mike.carden
 



On Wed, Aug 12, 2020 at 3:55 AM <W5EGA@...> wrote:

What do you mean by "O/C BS170's"? Is that overcharged, over current, or something else? 

In this context, O/C usually refers to Open Circuit which you can imagine being equivalent to a 'blown fuse'.

-- 
MC
 


Re: Adapt A Bioenno 24v LiFePO4 Battery To Run The QRPLabs 50 Watt PA?

Shane Justice
 

Hi Allison,

Back in the day (2004-2008), while I was working some man- portable military electronics, we had nickle metal hydride (NMH) battery technology. As that was as good as rechargeable batteries got back then. We found that whatever amp hour rating a battery pack had, it could only supply the max rated current (let's say 4AH) for half the time (4 Amperes for 30 minutes) before the battery was effectively exhausted. As we went to field testing, I used this rule of thumb when developing the fielding and logistics plan for spares, chargers, etc., for about 300 soldiers for several months of trials. 

At high discharge rates, the batteries heat up and become less efficient at converting chemical energy to electrical energy, this the reason to derate the capacity of the battery for high draw situations. 

Other derating is necessary to take into account for low/high temperatures from standard lab conditions of about 72F / 22C.

If I recall correctly, the was for a radio use of 10% transmit, 20%receive, 70% standby (squelched, no audio).

All those planning SOTA or emergency operations need to consider a more conservative estimation strategy to make sure they are not cought out- if you pack is light, but you run out of power, your radio expedition is over. That may be O.K. for this who use radio as just part of the overall experience, but for those who want to use the last moments of planned operating window, it would do well to either carry a heavier battery or gear to charge/maintain the battery for the duration of the operating portion of the expedition.

Just my $ 0.02 worth.

73,
Shane
KE7TR


On Aug 11, 2020 at 12:01, ajparent1/KB1GMX <kb1gmx@...> wrote:

I go with Gregs solution.  

Even with 95% efficient power converter efficiency diodes are a poor way to go.
They just convert power to heat.

My bigger battery is a BB2590(mil- 180WH) and its really two nominal 14V 6.8ah batteries
in one compact plastic case with protection and SMB-bus.  The connector allows it
to be:
Two independent 14V batteries
One 13.2ah battery (parallel)
One 28V 6.8ah batter (series).
Full charge voltage is 16.5V for each half and nominal discharge voltage is 14.6V.
For two in series that runs from 33V to as low as 24.

So I did what Greg described a box that accepts that 33V max and with
two buck type converters selectable 13.8 from one and  24/28 volts
( 20v would be open and adjust).  DC from the battery is filtered coming
in and going out to keep any RFI inside the box.  The converters I found
(100W units) can support 6A at 13.8 and 4A at 24V.

Why 24/28V?  I have several small amps for portable use one is WA2EBY/k5oor
and it runs (linear) at 24V ncely with 45W out and he other is a smaller 
MRF454 that easily can do 100W but limited to about 55-60W.  Also a
few for VHF/UHF using MRF series ldmos that was 24-28V for 50W out.

I also have a matched solar charging rig for that battery.  Adds a 3x4x2"
die-cast box to the kit.

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


discrepancy in the build instructions for receiver kit.

geoff M0ORE
 

The assembly of my U3S kit + receiver is progressing well. U3S is completed and working OK.
Assembly of the receiver board nearly done and ready for intregation with the U3S. After building the BPF board and inserting into the mother board, I checked the connections to their destinations.
Using the schematic on page 2 of the instructions (rev 2), I could not get continuity from pins 3 & 4 of the OUT socket to the primary of T3. ( what happened to T1 & T2?)
I then could not get continuity from pins 1 & 2 of the IN socket to the source of Q1.
Looking at the PCB layout on page 5, the blue traces show that the pins of socket adjacent to IC2 go to the transformer winding and alternative RF input. Other blue traces show the pins on the socket adjacent to R21 / C16 go to the source of Q1. Buzzing out the connections on the board confirm these findings.
In conclusion, the IN and OUT labels on the schematic should be reversed and the screen printing on the BPF board needs to be changed and the diagram on page 17 also needs to be amended.
Given the number of these kits which apparently have been built, I am surprised that this anomaly has not been spotted before. It does not prevent operation of the kit but could hamper any faulting. Sorry if these findings cause any distress. I am very satisfied with the kits and the very high standard of the documention.


Re: QCX-mini discussion from Saturday's ZOOM Q&A session

namerati@...
 

On Tue, Aug 11, 2020 at 07:53:10PM +0300, Hans Summers wrote:
I had in mind that I may make a simple firmware mod that for such times
when you are in trouble and forgot your paddle, the right button could be
used as a key. That would also work on the QCX+ too of course.
Brilliant!


Re: using U3S with receiver module for WSPR in IQ mode

fred.g3srf@...
 

Thanks for the suggestion. I have been using WSPR with WSJT-X with a Racal rig for some time. When I get bored, I have one QSO with that setup on FT8 then get even more bored and wonder why I bothered. I am only comtemplating the U3S set up as something to do while during the lockdown.


Re: Firmware upgrade blues - help needed

Anders Landgren
 

Thanks, Alan

Yeah, I did. Tried those instructions (including using that oldish link) and I do get my programmer listed as they do, in the device manager. 

About to try it all on my wife's computer now. So might be the last you hear from ol' NNO ;-P


Change request, add morse characters #firmware #qcx

Dick PA3CW
 

Great little rig the QCX +, very impressed.  A request for a small addition in next firmware:  Please add the morse character + (AR, di dah di dah dit) and VA (di di di dah di dah), i always use them in my messages, and unable to do so yet in QCX.  Small request :)
Thanks!
Dick PA3CW


Re: Adapt A Bioenno 24v LiFePO4 Battery To Run The QRPLabs 50 Watt PA?

ajparent1/KB1GMX
 

An aside...

IT really helps to think of the battery as a reserve of x-many
watt-hours that depletes to zero.  Max current and terminal
voltage set the usable limits and for all battery tech there are
max acceptable voltage and minimum (can be for the
battery or radio) so typically you cannot use 100% of that.
If there is power conversion [switch mode for efficiency] from
higher to lower voltage you may get closer to that but still 
less than 95%.

In the end budget or weight dictate the largest battery 
and out of that you get how long you can run before its
depleted.

The 50W amp doing 45W out is eating something in the 70-80
watts of power.  So while even a small battery can easily supply
the 4A, the question is for how long?

To run a day (8h) at 20% duty cycle you will need a 80-90 WH
battery.  In lithium that's a 4Ah with some reserve.  Remember
Lithium tech does not like to be run totally dry.  For a 24 hour
event like field day you need about 3x that or 12AH.  It also
assumes that battery only runs the amp.  I allowed a few extra
watt-hours in the battery for the standby current of the amp as
its not zero (about 1.4w or 11wh for 8 hours).

A QCX wants about .11A on rx and .5A tx so averaded 20% its about 
.3A average (11 wh rounded).  For 8 hours a 2Ah battery will do at 12V.
For 24 hours 8ah or larger battery with reserve will do nicely..

There it is worked for how big a battery is needed for 8 and 24 hour use.
its easy to underestimate and 20% is actually low duty cycle 40% or more
is Cw contesting.  So bring a bigger battery!

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


Re: QSO Today Virtual Ham Radio Expo - 08/09 August

jim
 

hp-stream...linux mint 19.1...wine runs fine (use with EZNEC 6.0 and others stuff)

Jim

On Monday, August 10, 2020, 7:24:29 PM PDT, muelabfall-dem1 via groups.io <muelabfall-dem1@...> wrote:


Hello Reg,

As I regularly follow Hans (anxiously awaiting the availability of the QSX xcvr), I happened to come across your post and mention of Linux & Windows programs.


Are you aware that there are a few programs that allow you to run Windows programs under Linux?

If not, may I respectfully suggest that you might want to first consider watching this YouTube video comparing the different available programs:   
https://www.youtube.com/watch?v=dqZDuKB949U

Codeweavers Software (not free - but  free to try):  https://www.codeweavers.com/products/crossover-linux

Play on Linux:  https://www.playonlinux.com/en/  is free to download.

WINE is widely recognized by the Linux community and is free to download. 

https://appdb.winehq.org/objectManager.php?bIsQueue=false&bIsRejected=false&sClass=application&sReturnToTitle=Browse%20Applications&sTitle=Browse+Applications&iItemsPerPage=25&iPage=1&iappCategoryOp0=11&sappCategoryData0=125%3Cbr%3E&sOrderBy=appName&bAscending=true&iItemsPerPage=25&iPage=2

Play on Linux runs very slow on my 14 year old under-powered laptop using Linux Mint.   I haven't been able to get Wine to work correctly on the old laptop (but then again, I am still learning about Linux).  Downloading the trial version of Codeweavers is on my "to do" list when I can finally make the time.

Just thought I would share the above programs info in case you were not aware of these options.

Cheers & Beers,
Steve - KU9J






Re: Adapt A Bioenno 24v LiFePO4 Battery To Run The QRPLabs 50 Watt PA?

ajparent1/KB1GMX
 

I go with Gregs solution.  

Even with 95% efficient power converter efficiency diodes are a poor way to go.
They just convert power to heat.

My bigger battery is a BB2590(mil- 180WH) and its really two nominal 14V 6.8ah batteries
in one compact plastic case with protection and SMB-bus.  The connector allows it
to be:
Two independent 14V batteries
One 13.2ah battery (parallel)
One 28V 6.8ah batter (series).
Full charge voltage is 16.5V for each half and nominal discharge voltage is 14.6V.
For two in series that runs from 33V to as low as 24.

So I did what Greg described a box that accepts that 33V max and with
two buck type converters selectable 13.8 from one and  24/28 volts
( 20v would be open and adjust).  DC from the battery is filtered coming
in and going out to keep any RFI inside the box.  The converters I found
(100W units) can support 6A at 13.8 and 4A at 24V.

Why 24/28V?  I have several small amps for portable use one is WA2EBY/k5oor
and it runs (linear) at 24V ncely with 45W out and he other is a smaller 
MRF454 that easily can do 100W but limited to about 55-60W.  Also a
few for VHF/UHF using MRF series ldmos that was 24-28V for 50W out.

I also have a matched solar charging rig for that battery.  Adds a 3x4x2"
die-cast box to the kit.

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


Re: using U3S with receiver module for WSPR in IQ mode

Ton - PA0ARR
 

Fred,. You can always use the Poly network kit to filter out USB. Then you can use wsjt-x for all modes.
Other option is to use e.g. HDSDR as sdr receiver and pipe the USB audio from HDSDR to wsjt-x
73 Ton PA0ARR


Re: QSO Today Virtual Ham Radio Expo - 08/09 August

R. Tyson
 

Hi Steve,

Thanks for the suggestions. I do use Wine but with variable success.
Some programmes will run fine using it while other won't.

I had great success some time ago with the Codeweavers offering. I
initially used the free version but never upgraded. I may consider
having another look at it as it "just worked". There are not many
occasions where I really need Windows programme and if it won't run
under Wine then I have a Win laptop and my wife has a Win10 PC.

73's

Reg G4NFR






--
tysons2 <tysons2@...>


Re: Difficulty during alignment - RF output #20m #qcx #problem

W5EGA@...
 

Alan, 

I don't know for sure - but I have checked for continuity between each set of pads at L1, L2, L3, and L4. I have not checked for continuity from the beginning of the LPF to the end of the LPF (if that is even possible - if it is please describe how to do that). I also checked for damaged capacitors and other components in the immediate area of the board and did not detect anything unusual. 

What do you mean by "O/C BS170's"? Is that overcharged, over current, or something else? I'm sorry, but I am a "new to the hobby" guy more than I am an "electrical engineer!" :) 

Thank you again for your time and efforts to get me up and going!
 


Re: QCX-mini discussion from Saturday's ZOOM Q&A session

Hans Summers
 

 
>I uploaded a 17-minute segment of the recording of Saturday's ZOOM Q&A
>session, this segment is about the proposed QCX-mini CW transceiver. I do
>hate seeing and hearing myself on video but endured the pain regardless...
>see https://youtu.be/KBd8r2kaklc if interested!

That looks fantastic, thank you very much!

Is the layout going to include enough room for an SMD tact-switch
straight key* or will it be the keyless design of the QCX+?

I had in mind that I may make a simple firmware mod that for such times when you are in trouble and forgot your paddle, the right button could be used as a key. That would also work on the QCX+ too of course. 

73 Hans G0UPL
http:/qrp-labs.com 


Re: QCX-mini discussion from Saturday's ZOOM Q&A session

namerati@...
 

On Tue, Aug 11, 2020 at 03:01:53PM +0300, Hans Summers wrote:
Hi all

I uploaded a 17-minute segment of the recording of Saturday's ZOOM Q&A
session, this segment is about the proposed QCX-mini CW transceiver. I do
hate seeing and hearing myself on video but endured the pain regardless...
see https://youtu.be/KBd8r2kaklc if interested!
That looks fantastic, thank you very much!

Is the layout going to include enough room for an SMD tact-switch straight key* or will it be the keyless design of the QCX+?

* my paddle doesn't like getting up in the morning, and has a habit of crawling out of my bag and back into the comfort of its desk drawer just as I'm leaving. Being able to use the onboard key has therefore saved a few trips. It is definitely not my fault and I am definitely not being forgetful, it's that darn lazy paddle!


Re: QCX mini: RF output BNC or SMA #poll-notice

namerati@...
 

I hope the suggestion for including SMA connector pads on the PCB will still stand, even if SMA is not the "official" connector. (As noted previously, the SMA connector pad layout also permits the more-reliable MCX and probably other small-format RF connectors as well)

On Tue, Aug 11, 2020 at 03:14:05PM +0300, Hans Summers wrote:
Hi all

On the topic of BNC vs SMA preference for the QCX mini RF connector... I
closed the poll since it had been open for a few days and I think everyone
had a chance.

Of the 5,136 members of this group, 118 votes were received (2.3% voter
turnout).

Results:

BNC: 90 votes (76%)
SMA: 28 votes (24%)

So. There you go. Democracy. Two mainstream choices, neither of which may
actually represent your views. Only a minority of voters actually bother to
vote. Wow. We might almost be voting for the leadership of our country! Hi
hi. Except that the result would be a lot closer and then we could spend
the next 4 years arguing about it :-)

73 Hans G0UPL
http://qrp-labs.com

On Thu, Aug 6, 2020 at 3:44 PM Hans Summers via groups.io <hans.summers=
gmail.com@groups.io> wrote:

A new poll has been created:

On the proposed QCX-mini, do you prefer a BNC connector like on QCX, or an
SMA connector?

1. BNC
2. SMA

Vote Now <https://groups.io/g/QRPLabs/vote?pollid=15715>

Do not reply to this message to vote in the poll. You can vote in polls
only through the group's website.