Re: QRPguys multi-DC blows BS170's in a few seconds
#photo-notice
if you want? I Can send photos of the schematic s? I have of the child of? what you have that did not end up goioong to market though the CODE for it in C for Atmel? was put on the WebBlogsphere.? What you have should work as a VFO driver anyway.? ?The RX path in the new schematic I don't trust at all but it can be fixed I use a single SA mixer chip and drives 3x? BS 170s in a conventional manner from a BJT.? ? The Rx path is direct conversion. It could all be bult using manhattan pads or a? rondel creator on a bit of PCB blank , apart from the? Ics which would have to go on carriers or upside down.? It ssems? protoype PCBs have been built because a photo of? a built up PCB with the LEDs running on 7 Mhz? was displayed on? the? QRPGs? ?Site a few months ago and then taken down.?
I got the schematic as? DLOad and Print? and went back with a few? revisions as suggestions like FINE TUNE capability.? Basically as shown it was not? mature design but would work for CW at least.? Frankly and bluntly ,? Hans Summers? (QRP Labs )? knows how to do this stuff in such a way that the ccts are repeatable. Other people- Not so much.? The bright spot from your POV is that you have a VFO that works.? Sort of.
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I include a? ?Russki or Polish design mainly as it has an ingenious scheme to take? ? output? at? F and Give? it out as the second harmonic from a sort of Power oscillator amp over the amateur ranges - with say? 7 to ten dBm to drive a crude mixer or a Non crude mixer as a ADE -01 -24s are floating around on th einternet at not bad prices.? ?This is the same as the std aDE-01? with the centre connections reverse it the GND and the injection point to the Diode ring mirrored over the? SBL and ADE? conventional connections.? ? THe rest of the circuit I really would not touch.? It's a bit juvenile.?
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Re: QRPguys multi-DC blows BS170's in a few seconds
#photo-notice
I realize now the resistance across C17 could be from any element between 5V and ground. pulling U1 (TINY45) does not change this measurement.
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I answer Bill's other question - the Gate is getting ~4V. The drain starts about there and climbs until I key up. I verified 5V at pin 14.
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Re: QRPguys multi-DC blows BS170's in a few seconds
#photo-notice
Great comments, Bill.
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U3 is indeed crooked, but I have rechecked all connections from the tops of all pins.
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DC vs square wave to the BS170 might be the right direction. I think that might explain the current draw being nearly twice expected!
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I may have narrowed down the issue. With VFO, everything past R8 (2.2k) becomes meaningless small numbers on the frequency counter. I switched to VXO, and I don't think anything is oscillating.
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R8 I think is fine - I measure 2.2k across it, as well as 1k and 3.2k from each side to ground, as expected. I am now focused on C17 - I am measuring 2k across it. Should I pull this and measure it off the board? Am I missing something on the schematic that would make this measurement sensible? I'm not sure what that capacitor does, would it be safe to try keying without it?
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Re: QRPguys multi-DC blows BS170's in a few seconds
#photo-notice
I have a schematic of the? ?DSB/'CW xceiver? by WEBER that? the Qrp were going to sell in October at? Pacificon.? It's all turned into a mess as soneone is sick or dying or whatever.?
I can photograph that and you can cut it back to CW only? THe Rx circuit is crude and I'd not put my name to it. I 'll mark p or indicae a Gold plate Dave Benson Rx circuit that will work.? Have pper copy only.
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THe RF transmit is done PROPERLY on this DSB/CW? no modelname. widget? ?It will work??
Weber left off some component details on schematic? (for whatever reason...) . I have back calced them from first princip.
You will need VEroboard and wire and so on to? build his up and graft it into the existing Rubbish ?? deisgn.? it uses? ?three x? BS? 170? in parallel as the PA all in class C bias.?
you will need? at a minimum an RF probe and two DVMs? or a basic? VM and a DVM? to get a? revised design like this going.??
Otherwise just let us know that you got the original design working....
The schematic or this 3-4 W? TCVER was taken off the WELL KNown site,? but they have now killed hat? early warning and? pricing information .?
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?
regards
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Re: QRPguys multi-DC blows BS170's in a few seconds
#photo-notice
How can the BS170 gates get 13v? The only way I can see is if the 5v regulator feeding U3 is shorted. What's the voltage on pin 14 of U3, or on C9?
Is every pin of U3 making contact with its pad? It looks just a bit skewed.
U3 is supposed to send a square wave to the BS170 gates during key-down, but it's apparently sending DC instead.
I'd be nervous about the signal that comes back to U3C.? That could? go on or off and lock the amp (Ac02) section out permanently.? Ditto? for shorts in either of the? capacitors leading to the other? Ac02 section.? ??
Weber should get a design at? Boeing... he'd have every second? Boeing falling out of the sky . This is not a robust design.
QRP labs? dot COM IDEAS from Hans =
?Have a look at what? ?Hans? Did in the? Mdx? ?power amp quad? BS 170s.. that's a robust design.? it uses an AC logic? ?Exor gate as a phase splitter... pure class .? you might be able to build that on? a bit of Veroboard and punch it into your existing design.? Some of these parts are avail from Futurlec .com as? DIP parts . But not the? AC? Exor gate .
?the? inductor feeding? the? split transfrmer on the output side of the? quad has to have? a NORTH facing? 1n4048 diode on it to protect the mosfets from? shutdown spikes.? (Hans fixed that? in the QMX via a firmware change)? ?you can key that supply line with a BD 140 or similar PNP power transistor to give soft keying to the amplifier. (his one).? With just two BS 170s ,? this Han cct will give? about? 3W out.? The RF OP impedance like that with 9 V supply in that configuration would be around? 38 ohms. (that's the? Drain to Drain impedance)
Timothy E. Fidler : Engineer BE Mech Auckland?
?HR Call? ZL1MZR? (HF)
Telephone Whangarei?? 022? 691 8405
---------- Original Message ----------
Thank you, Timothy, for reminding me of those measurements from my initial tests.
Redoing these measurements with the 9V supply, the 4V on gate is still the same. Drain voltage starts around 4-5V on key-down and looks like it will climb until failure.
I will check for shorted capacitors anywhere near either side. The gate is driven directly from the A74CO2 chip. The supply voltage is 5V.
While I try my best, I'm not the most experienced when it comes to evaluating design. If you or anyone else is interested in the schematic, it is on page 15 in the manual available under Files here.
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Re: QRPguys multi-DC blows BS170's in a few seconds
#photo-notice
Is every pin of U3 making contact with its pad? It looks just a bit skewed.
U3 is supposed to send a square wave to the BS170 gates during key-down, but it's apparently sending DC instead.
I'd be nervous about the signal that comes back to U3C.? That could? go on or off and lock the amp (Ac02) section out permanently.? Ditto? for shorts in either of the? capacitors leading to the other? Ac02 section.? ??
Weber should get a design at? Boeing... he'd have every second? Boeing falling out of the sky . This is not a robust design.
QRP labs? dot COM IDEAS from Hans =
?Have a look at what? ?Hans? Did in the? Mdx? ?power amp quad? BS 170s.. that's a robust design.? it uses an AC logic? ?Exor gate as a phase splitter... pure class .? you might be able to build that on? a bit of Veroboard and punch it into your existing design.? Some of these parts are avail from Futurlec .com as? DIP parts . But not the? AC? Exor gate .
?the? inductor feeding? the? split transfrmer on the output side of the? quad has to have? a NORTH facing? 1n4048 diode on it to protect the mosfets from? shutdown spikes.? (Hans fixed that? in the QMX via a firmware change)? ?you can key that supply line with a BD 140 or similar PNP power transistor to give soft keying to the amplifier. (his one).? With just two BS 170s ,? this Han cct will give? about? 3W out.? The RF OP impedance like that with 9 V supply in that configuration would be around? 38 ohms. (that's the? Drain to Drain impedance)
Timothy E. Fidler : Engineer BE Mech Auckland?
?HR Call? ZL1MZR? (HF)
Telephone Whangarei?? 022? 691 8405
---------- Original Message ----------
Thank you, Timothy, for reminding me of those measurements from my initial tests.
Redoing these measurements with the 9V supply, the 4V on gate is still the same. Drain voltage starts around 4-5V on key-down and looks like it will climb until failure.
I will check for shorted capacitors anywhere near either side. The gate is driven directly from the A74CO2 chip. The supply voltage is 5V.
While I try my best, I'm not the most experienced when it comes to evaluating design. If you or anyone else is interested in the schematic, it is on page 15 in the manual available under Files here.
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Re: QRPguys multi-DC blows BS170's in a few seconds
#photo-notice
I'd be nervous about the signal that comes back to U3C.? That could? go on or off and lock the amp (Ac02) section out permanently.? Ditto? for shorts in either of the? capacitors leading to the other? Ac02 section.? ??
Weber should get a design at? Boeing... he'd have every second? Boeing falling out of the sky . This is not a robust design.
QRP labs? dot COM IDEAS from Hans =
?Have a look at what? ?Hans? Did in the? Mdx? ?power amp quad? BS 170s.. that's a robust design.? it uses an AC logic? ?Exor gate as a phase splitter... pure class .? you might be able to build that on? a bit of Veroboard and punch it into your existing design.? Some of these parts are avail from Futurlec .com as? DIP parts . But not the? AC? Exor gate .
?the? inductor feeding? the? split transfrmer on the output side of the? quad has to have? a NORTH facing? 1n4048 diode on it to protect the mosfets from? shutdown spikes.? (Hans fixed that? in the QMX via a firmware change)? ?you can key that supply line with a BD 140 or similar PNP power transistor to give soft keying to the amplifier. (his one).? With just two BS 170s ,? this Han cct will give? about? 3W out.? The RF OP impedance like that with 9 V supply in that configuration would be around? 38 ohms. (that's the? Drain to Drain impedance)
Timothy E. Fidler : Engineer BE Mech Auckland?
?HR Call? ZL1MZR? (HF)
Telephone Whangarei?? 022? 691 8405
e: Engstr@...
On Thu Nov 07 2024 KC0ADA <joshwicoff@...> wrote:
---------- Original Message ----------
Thank you, Timothy, for reminding me of those measurements from my initial tests.
Redoing these measurements with the 9V supply, the 4V on gate is still the same. Drain voltage starts around 4-5V on key-down and looks like it will climb until failure.
I will check for shorted capacitors anywhere near either side. The gate is driven directly from the A74CO2 chip. The supply voltage is 5V.
While I try my best, I'm not the most experienced when it comes to evaluating design. If you or anyone else is interested in the schematic, it is on page 15 in the manual available under Files here.
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Re: QRPguys multi-DC blows BS170's in a few seconds
#photo-notice
Thank you, Timothy, for reminding me of those measurements from my initial tests. Redoing these measurements with the 9V supply, the 4V on gate is still the same. Drain voltage starts around 4-5V on key-down and looks like it will climb until failure. I will check for shorted capacitors anywhere near either side. The gate is driven directly from the A74CO2 chip. The supply voltage is 5V. While I try my best, I'm not the most experienced when it comes to evaluating design. If you or anyone else is interested in the schematic, it is on page 15 in the manual available under Files here.
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Re: QRPguys multi-DC blows BS170's in a few seconds
#photo-notice
Previous message said? 4 V on gate . These are? logic level mosfets and should never see more than about 2.3 V on gate or in a non currnet controlled cct they will blow.? Don't assume they work like IRF? 510.
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You need to go back to schematic and see where that High DC has come from - your construction fault or? some other chip that has blown perhaps or corrupted firmware even.? ?? Is there a? DC blocking capacitor that has been left out somewhere? or a short across it ?? or an internal short IN the capacitor or even a crummy design fault ??
?
ZL1Mzr?
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Re: QRPguys multi-DC blows BS170's in a few seconds
#photo-notice
I'm revisiting this project with some mixed success and hoping someone can point me in the right direction.
I've again replaced all 3 BS170's. I am now limiting voltage to 9v and testing with a straight key.
The VFO and receiver work flawlessly.
On key-down, I hear the side-tone, but I get no power to the antenna. All 3 BS170's get hot.
Current draw seems unusually high. I will see ~1.5A on key-down. If I limit current to 1A or less, the side-tone motorboats.
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Gang,
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QRPBuilder is announcing two new paddles. They are an iambic and single lever design similar to our other paddles, but are attached to your project by neodymium magnets, and can be moved from radio to radio, or removed for storage or transportation.
?
?
?
73,
?
Ken ¨C wa4mnt
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Re: Oddball kit for sale....DSP610....and yes I realize it's nota KD1JV design but as kit builders you might be interested
It was interesting over 12 years ago...? Now some of the parts might be a challenge?
to track down.
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At that time I almost pulled the trigger and then it went moribund.
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Allison
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Oddball kit for sale....DSP610....and yes I realize it's nota KD1JV design but as kit builders you might be interested
I have all the parts (labelled and separated by source such as Mouser, DigiKey etc) to build this 30-40w HF kit.
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Designed by Jim Veatch of HobbyPCB details are at
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The original design is for a 6/10m rig and that is what I have the parts for.
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Cornell University have expanded this via a few parts substitutions to services 12/15/17/20.
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Both approaches require a case/front panel to be sorted out (I.e. one is not included).
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Package includes all the 6/10m PCBs and parts.?
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This is not really a beginner kit but should be achievable for anyone with a small kit or two under your belt.?
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$65 for the package and $18 USPS flat rate box shipping.
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Paul
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Re: Power plug for SodaPop 2 HighBand
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Re: Power plug for SodaPop 2 HighBand
Hi, My SODA POP II uses a 5.5mm OD plug. It's the same plug I use for my KX3. I think the ID is 2.1mm. Boy what a fun rig. 73 Peter/AA2VG
Anybody know what size plug it takes?
thanks
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Power plug for SodaPop 2 HighBand
Anybody know what size plug it takes?
thanks
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Re: Having a ball with my SodaPop II
Yep, I tried to hand solder a ATS-V HB and I think I destroyed it.?
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Having a ball with my SodaPop II
I built the Soda-Pop II HB version a couple months ago and am posting here to say I¡¯m having a ball with it. The high bands have been pretty slow in my area but I¡¯ve still managed to pick off quite a few POTA stations with it from the home QTH.
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It took me two attempts/kits to succeed. Only a few years ago, I was able to hand-solder Si5351 chips, but I have now discovered, to my chagrin, that my eyes aren¡¯t up to it anymore. This was my first go with solder paste and hot air; what fun! Very satisfying.
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I¡¯ve gone through almost an entire roll of filament while trying to perfect a 3d-printed enclosure. Once I¡¯m happy with the design, I¡¯d be delighted to share it if anyone is interested.
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Hope everyone else on the reflector is having a good summer.
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¡ªNCOQ Tim
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Razvan, Hi. My SODA POP does go to the ErS.E (erase) mode most of the time after Cal but it takes about 8-10 seconds. My only suggestion is to try a different touch on the RIT button (light touch or heavier touch).? I found that if I had the 10Mhz signal adjusted correctly it remained stable even if I accidentally entered Cal. If I accidentally enter CAL I just turn the rig off and then back on again to operate.? If you do enter the erase mode you will need to readjust the 10 MHz in the CAL mode.? I don¡¯t plan on going into the erase mode any longer. I did use it multiple time when I could not get things working which was due to several bad solder joints. ?It works well now.
I hope that helps.? 73?
toggle quoted message
Show quoted text
On Aug 16, 2024, at 6:13?PM, DL2ARL via groups.io <dl2arl@...> wrote:
? Hello,
maybe you can help:
?
With the "Soda Pop High Bander" I can not find the Reset menue. It would be supposed to work this way:?
"Click and hold closed the RIT switch for 8 seconds until [ErS.E]"
(quote from the manual). But there are only 3 menues I can find under the RIT switch: the RIT itself, the Frequency Memory after roughly 1 second of holding the RIT pressed and finally the CALibration Menue, that comes after about 3..4 seconds of holding the RIT down.
Nothing else behind, even if I hold the RIT down until I get a sore finger...
Just reporting. I can live very well without the Reset menue, because if I want to change something with the calibration, I just enter the CAL menue. Hope I will never corrupt the rig as such as to desperately be in need of a real RESET.
73 de Razvan dl2arl
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Hello,
maybe you can help:
?
With the "Soda Pop High Bander" I can not find the Reset menue. It would be supposed to work this way:?
"Click and hold closed the RIT switch for 8 seconds until [ErS.E]"
(quote from the manual). But there are only 3 menues I can find under the RIT switch: the RIT itself, the Frequency Memory after roughly 1 second of holding the RIT pressed and finally the CALibration Menue, that comes after about 3..4 seconds of holding the RIT down.
Nothing else behind, even if I hold the RIT down until I get a sore finger...
Just reporting. I can live very well without the Reset menue, because if I want to change something with the calibration, I just enter the CAL menue. Hope I will never corrupt the rig as such as to desperately be in need of a real RESET.
73 de Razvan dl2arl
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Timothy Fidler
Paul Gacek (W6PNG/M0SNA)
DL2ARL