Re: Idle current, QRPGuys DSB Digital Transceiver
Chuck,
Here's what I got:
20m, 1.1w out @250mA
30m, 1.1w out @250mA
40m, 4.0w out @600mA
Those reading taken with Steve's instructions to advance the audio input until it reliably transmits, plus just a tad to insure it switches.
ken
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Re: Idle current, QRPGuys DSB Digital Transceiver
Thanks, Ken.? That's very helpful?information.
73.......Steve Smith WB6TNL
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Peanut Power Spring - SUNDAY - 6PM to 7:59PM EDT
Come and have some fun, this Sunday!? An easy one from North GA QRP CLUB!
Check 2 things:
1. The*RULES*on the Sprint page:h <>
CW/SSB/*DIGITAL* .......? QRP or HIGH power - 80/40/20
2. Check to see if you already have a number:
If not, sendkj4ym@... <mailto:kj4ym@...>an email to request a number!? There are now over 300!
Simple, see you on Sunday.? And visit the nogaqrp.org club webpage.
--
Jim Stafford W4QO Roswell, GA USA
QRP ARCI #6515 www.qrparci.org
NoGaQRP - Peanut #1 - www.nogaqrp.org
G-QRP#7388 MI-QRP#697 SKCC#1281 FP#21
QRP- When QRO is simply not enough (fun)!
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Re: Idle current, QRPGuys DSB Digital Transceiver
Ken gets the same values that I do for receive.
Question is going to be what do you get with
transmit with WSJT-X software on TUNE?
chuck, k7qo
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On 10/5/19 1:42 AM, Ken wa4mnt wrote: Steve,
12.0 V on the lab supply, 50 ohm dummy load. With the berg connector in place , I get 53mA with the bias set full CW. I rotate CCW to 68mA, to set the bias. I then remove the berg connector for a receive current draw of 16mA.
ken
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Re: Idle current, QRPGuys DSB Digital Transceiver
Steve,
12.0 V on the lab supply, 50 ohm dummy load. With the berg connector in place , I get 53mA with the bias set full CW. I rotate CCW to 68mA, to set the bias. I then remove the berg connector for a receive current draw of 16mA.
ken
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Re: Idle current, QRPGuys DSB Digital Transceiver
It is going to depend on the supply voltage. A lot I think. Did
not run some tests.
Using a lab supply at 12.00V, I was getting an idle current of around
61-63mA if I remember correctly. Around 460mA on transmit, which I
thought was a bit high. All this on 20m with a 1:1SWR. I can't find
my notes, so a number of people need to set their P/S voltage at
12.00V exactly using a lab supply and post their readings. Safety
in numbers, hoping that people can do this accurately.
Sometime in the next week I'll try to set things up again and do double
check.
chuck, k7qo
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On 10/4/19 8:37 PM, sigcom1 wrote: Chuck,
After setting the Gate bias voltage according to the instructions, what is the resultant idle current on your DSB rig (jumpers set for bias setup)?
(I know it will vary somewhat from rig to rig)
73.......Steve Smith WB6TNL
"Snort Rosin"
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Idle current, QRPGuys DSB Digital Transceiver
Chuck,
After setting the Gate bias voltage according to the instructions, what is the resultant idle current on your DSB rig (jumpers set for bias setup)?
(I know it will vary somewhat from rig to rig)
73.......Steve Smith WB6TNL
"Snort Rosin"
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Re: QRPGuys DSB Digital Transceiver
Good morning all,
I was thinking of buying one of these little devices and I had the same
questions in my mind about the DSB mode of operation.
The other thing I was questioning is the design of the final output stage.
I know it's been a tradition in ham radio to either parallel tubes or
transistors to get the wattage rating that you need, but in this case there
should be a single mosfet that can do the job is economically as three? In
addition I like to heatsink the output devices and this really doesn't lend
itself to effective heat sinking. Other than some gimmick add-ons for
TO-92's, were never really designed to be heat sinked. (I know that some
TO-92 devices produced with a small heatsink tab, but that's not what we
have here from the kit pictures.)
Does anyone out there have a suggestion for a sutible single output device
in a TO-220 form factor or similar?
Thank you,
Randy ab9go
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technology.
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Re: powering an SWR meter from transceiver output
Hi John,
Thanks for the data. I will look into them.
I was reading a lot during the work commute (2x 45 minutes in public transport here in Prague every working day). I think I can increase the resistor values loading the detector diodes significantly, up to 100kOhm - 200kOhm. This will change the compensation curves again.
I am sure the compensation circuit would work, but this design of mine is an exercise in minimalism, and the op-amp would add to the size, price and current draw of the circuit.
My goal is a tiny back packing end fed tuner which will just work, no worries about the battery or cables to battery. I am not excited about the temperature dependence which would likely be compensated for by the circuit you suggested, but I can live with it.
Vojtech
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Re: QRPGuys DSB Digital Transceiver
At 1W on 20M, I'm not going to worry about it too much for my very casual use.
N1ESE
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On Thu, Oct 3, 2019 at 2:56 PM vbifyz <3ym3ym@...> wrote:
Did some search on this topic, found some heated opinions and discussions.
Looks like It is legal from the FCC standpoint, but questionable from the ham ethics standpoint.
My personal preference would be to use Si5351a for transmit (and for VFO receive), using something like Jason's NT7S Arduino JTencoder library.
Mike AF7KR
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Re: QRPGuys DSB Digital Transceiver
Did some search on this topic, found some heated opinions and discussions.
Looks like It is legal from the FCC standpoint, but questionable from the ham ethics standpoint.
My personal preference would be to use Si5351a for transmit (and for VFO receive), using something like Jason's NT7S Arduino JTencoder library.
Mike AF7KR
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Re: QRPGuys DSB Digital Transceiver
Is DSB transmission of FT8 allowed?
73, Mike AF7KR
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Re: powering an SWR meter from transceiver output
Hi Vojtech,
Bunch of diode curves plotted here:
Which might be useful for checking spice computed curves.
Also of interest is section "1N5711 Response with 10 k¦¸ Load
with and without Compensation Amplifier" which demonstrates using an
operational amplifier with matched diode in feedback. Feedback diode
greatly compensated out diode voltage knee. Looking at red trace in the
plot, notice RMS V = detected voltage times a constant. therefore no
curve necessary.
Following Error plot suggests less than 0.3dB error down to 0.1 Vrms
input. Flat from 0.4 Vrms and above.
John KN5L
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On 10/3/19 6:12 AM, Vojtech Bubnik wrote: Here is a preliminary documentation of the EFHW tuner with a real SWR meter:
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Re: powering an SWR meter from transceiver output
Here is a preliminary documentation of the EFHW tuner with a real SWR meter:
The schematic drawings and printed board design are by OK1HRA.
The firmware works, but the diode curve calibration is not yet integrated, and power saving methods are not yet implemented into the firmware.
We will be thankful for constructive feedback on the circuit design and printed board layout.
73, Vojtech OK1IAK
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The Ender 3 is a great printer, but Creality took a few shortcuts. I just had to replace the plastic extruded with a metal one: All prints came out underextruded and after some debugging, I noticed that the filament was working it¡¯s way into the plastic extruded - which created drag and a slower feeding of the filament. This is the part you need: (or the equivalent via the slow boat from China). I just did this the other day, and my first prints yesterday (antenna insulators for a linked dipole) were great. There are videos on YouTube that show the whole process.
--
Karl Heinz - K5KHK
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AZ ScQRPions Meeting is this Saturday 10:45 at Fuddruckers, I-17 and Dunlap.
Be There!
C U There
Mike Baker K7DD
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Look in your slicer for a way to turn the top and bottom layers off.
In Cura, look under Shell. Set Top Layers and Bottom Layers = 0.
Let it reslice, then click on Preview. You should see the infill clearly exposed. You might want to experiment with different infill patterns to get a grid you like. You'll see the results in preview as you make changes.
BTW, the models come into Cura on edge. They need to be printed with with the top surface of the case down. If you try to print it on edge, turning off the top/bottom layers will leave those sides with exposed infill. That isn't what you want. Not to mention other printing ills from overhangs from printing it on edge like that.
Ender 3 is tremendous bang for the buck. The mechanics are all there, but the slicer is more than half the trick to getting the results you want.
Eric KE6US
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On 10/2/2019 9:52 AM, chuck adams wrote:
o Enclosure from . Let me
know if you figure out how to do without it being solid like mine.
I'm no expert on 3D printing with my Ender 3 printer.
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Chuck, good job. Now we just need a 3D designed case for the DSB Xcvr. *grin*
N1ESE
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On Wed, Oct 2, 2019 at 11:54 AM chuck adams <chuck.adams.k7qo@...> wrote:
Gang,
Been there. Done that.
Attached are three photographs and below is log for the first few
contacts made with the following:
o Raspberry Pi 4 in 3D printed enclosure with 40mm fan. Found 30mm
fans to be too loud.
o Enclosure from . Let me
know if you figure out how to do without it being solid like mine.
I'm no expert on 3D printing with my Ender 3 printer.
o USB sound module from . Paid the $2
extra to get vendor from ebay in USA so that I did not have to wait
on the slow boat. $3.95 today, Oct 3 2019, and let's see if the vendor
does the usual ebay stuff of running the price up if there is a run on
the critter.
o Using Raspbian Buster Full version for O/S from raspberrypi.org
downloads page.
o WSJT-X V2.1 from
using the armhf.deb version of Version 2.1.0 in the installation
packages section of the web page.
K7QO log for 20m at 1W or less. I recommend you not run too much
more than this or you will be distortion by over driving the audio
section. Your mileage may vary.
2019-09-27,15:58:30,2019-09-27,16:03:19,WW5XX,EL09,14.075346,FT8,-14,-12,1.0,,
2019-09-27,18:02:00,2019-09-27,18:03:30,KQ6CA,CN87,14.075352,FT8,-02,-15,,,
2019-09-27,18:09:45,2019-09-27,18:11:15,KD5FOY,EM12,14.074410,FT8,+08,-15,,,
2019-09-27,18:33:30,2019-09-27,18:34:30,WF3P,FN20,14.074632,FT8,-06,-15,,,
2019-09-27,18:35:09,2019-09-27,18:35:19,WF3P,FN20,14.074632,FT8,-06,-15,,,
2019-09-27,18:54:00,2019-09-27,18:55:30,KJ7COA,CN88,14.074925,FT8,+02,-15,,,
2019-09-27,19:15:00,2019-09-27,19:16:31,K9ZW,EN64,14.075022,FT8,-12,-23,,,
2019-09-27,19:32:30,2019-09-27,19:34:00,AE4CC,EM13,14.075307,FT8,-04,-20,,,
2019-09-27,21:00:45,2019-09-27,21:03:15,K2AMF,DN17,14.074838,FT8,-07,-17,,,
2019-09-27,21:42:15,2019-09-27,21:43:45,ND6H,CM97,14.074576,FT8,-11,-24,,,
2019-09-28,00:13:00,2019-09-28,00:16:00,NE8O,EN83,14.075104,FT8,-10,-16,,,
I have put the rig in storage for a while due to more pressing projects
for the RPi4.4 course (K7QO YouTube.com channel) and more than 60
physics programs that I have written in the last 20 years and not
published yet, so gotta get that done before they go to the landfill
with the rest of the estate.
FYI
chuck, k7qo, beta tester
|
Gang,
Been there. Done that.
Attached are three photographs and below is log for the first few
contacts made with the following:
o Raspberry Pi 4 in 3D printed enclosure with 40mm fan. Found 30mm
fans to be too loud.
o Enclosure from . Let me
know if you figure out how to do without it being solid like mine.
I'm no expert on 3D printing with my Ender 3 printer.
o USB sound module from . Paid the $2
extra to get vendor from ebay in USA so that I did not have to wait
on the slow boat. $3.95 today, Oct 3 2019, and let's see if the vendor
does the usual ebay stuff of running the price up if there is a run on
the critter.
o Using Raspbian Buster Full version for O/S from raspberrypi.org
downloads page.
o WSJT-X V2.1 from
using the armhf.deb version of Version 2.1.0 in the installation
packages section of the web page.
K7QO log for 20m at 1W or less. I recommend you not run too much
more than this or you will be distortion by over driving the audio
section. Your mileage may vary.
2019-09-27,15:58:30,2019-09-27,16:03:19,WW5XX,EL09,14.075346,FT8,-14,-12,1.0,,
2019-09-27,18:02:00,2019-09-27,18:03:30,KQ6CA,CN87,14.075352,FT8,-02,-15,,,
2019-09-27,18:09:45,2019-09-27,18:11:15,KD5FOY,EM12,14.074410,FT8,+08,-15,,,
2019-09-27,18:33:30,2019-09-27,18:34:30,WF3P,FN20,14.074632,FT8,-06,-15,,,
2019-09-27,18:35:09,2019-09-27,18:35:19,WF3P,FN20,14.074632,FT8,-06,-15,,,
2019-09-27,18:54:00,2019-09-27,18:55:30,KJ7COA,CN88,14.074925,FT8,+02,-15,,,
2019-09-27,19:15:00,2019-09-27,19:16:31,K9ZW,EN64,14.075022,FT8,-12,-23,,,
2019-09-27,19:32:30,2019-09-27,19:34:00,AE4CC,EM13,14.075307,FT8,-04,-20,,,
2019-09-27,21:00:45,2019-09-27,21:03:15,K2AMF,DN17,14.074838,FT8,-07,-17,,,
2019-09-27,21:42:15,2019-09-27,21:43:45,ND6H,CM97,14.074576,FT8,-11,-24,,,
2019-09-28,00:13:00,2019-09-28,00:16:00,NE8O,EN83,14.075104,FT8,-10,-16,,,
I have put the rig in storage for a while due to more pressing projects
for the RPi4.4 course (K7QO YouTube.com channel) and more than 60
physics programs that I have written in the last 20 years and not
published yet, so gotta get that done before they go to the landfill
with the rest of the estate.
FYI
chuck, k7qo, beta tester
|
Jim Stafford W4QO
Randy.AB9GO
