Re: Look what showed up from Germany!
Sorry to be a bit thick here but are you saying this is good or
bad????
On 17/04/2019 18:50, dkwflight wrote:
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The case I ordered at the same time as the kit transever
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Re: Multi band QCX plus Party time...
It takes very little power to spin a fan fast enough. Here i have picked off some RF into the load and rectified it (photos 2 and 3. ) The toroid turns do affect the impedance a bit above 30 mHz, but it's worth out to get proportional cooling. In the first photo I just used a battery and a 50C thermal switch.
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Re: Look what showed up from Germany!
Sooner or later for sure?? :<)
Dennis
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Check your emails from QRP Labs or log into your QRP Labs shop
account.
If it's a recent order, the SNo# should be contained in your Past
Order Details?
Older orders
Alan
On 17/04/2019 20:26, Karl Schwab via
Groups.Io wrote:
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I just received my 40 meter QCX kit, and I was looking for a
"serial number".? My QCX-20, has the serial number 748.? It might
be nice to know, as maybe someday, it maybe part of a QSO party
exchange, or maybe I have lucky number 20, 000 or something!? 73,
de Karl, KO8S
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AWESOME!! That means I should be getting my kit in a few days 40m also.
On Wed, Apr 17, 2019 at 3:26 PM Karl Schwab via Groups.Io <ktschwab= [email protected]> wrote: I just received my 40 meter QCX kit, and I was looking for a "serial number".? My QCX-20, has the serial number 748.? It might be nice to know, as maybe someday, it maybe part of a QSO party exchange, or maybe I have lucky number 20, 000 or something!? 73, de Karl, KO8S
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I just received my 40 meter QCX kit, and I was looking for a "serial number".? My QCX-20, has the serial number 748.? It might be nice to know, as maybe someday, it maybe part of a QSO party exchange, or maybe I have lucky number 20, 000 or something!? 73, de Karl, KO8S
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Re: Look what showed up from Germany!
I got mine today, but the dang kit still isn't here. Hope they ship this week WD7DT
The case I ordered at the same time as the kit transever
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Look what showed up from Germany!
The case I ordered at the same time as the kit transever
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Re: Multi band QCX plus Party time...
On 17/04/2019 14:08, John Kirby wrote: Nick,
That LED dummy load is kit I built 10 or more years back and have long since lost the manual.
The pcb is marked such...
XTAL SET SOCIETY
10W SMART DUMMY LOAD
www.midnightscience.com
My web search found 'dot net' and 'dot com'
and this...
?
... but no help with my kit.
Maybe you will have more luck other than gQQgle
The high Watt resistors (image) are 300 Ohm each
Based on the low Watt resistors;
one set of 4 (1000 Ohm) and
second set of 4 ( 100 k Ohm)
?l?? >auusme<??? four of the diodes are zener ...
????? and maybe all different voltage
???? >else<? how would one 'calibrate'? 1W, 2W, 5W 10W
???? with any degree of accuracy?
?????
and other 4 diodes maybe something like 1n 4148 or 914
I also >assume<? LEDs? are? 'low'? current type
The rf ground plane (second image) prevents reverse engineering a schematic.
72 73
John
N3?AZ John, Very many thanks - I'll have a ponder but I think the assumptions are correct - if I come up with anything I'll post to the group. Regards Nick M0HGU -- "Woof bloody woof." -- Gaspode the Wonder Dog (Terry Pratchett, Moving Pictures) 18:15:02 up 1 day, 5:34, 8 users, load average: 1.47, 1.05, 0.79 -- 73 Nick M0HGU
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Finally some spring weather,? 1st light coat of paint on the can & front panel. I should be back up on the air in a few days, just in time!
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Re: Easy lithium battery for QCX
For outdoor ham radio activities I bought some years ago a battery pack from Headway:
It has no built-in protection - therefore you are free in your choice.?
I have tested it with a Kenwood TS480-SAT and you can get 100W Power for more than 90% of the capacity. That means, voltage under load is very stable for a long time. For QRP rigs like the QCX this should be a very, very loooong time :-)
73
DL8CQ
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Re: Multi band QCX plus Party time...
...on a large fan-cooled cpu heatsink...
That's the key!
Jack, W8TEE
On Wednesday, April 17, 2019, 10:24:37 AM EDT, Steve in Okinawa <sfab43@...> wrote:
I've used a few of those 150 watt terminations on various heatsinks. The power rating is no joke-- on a large fan-cooled cpu heatsink they will dissipate 149.9 watts all day long. At 150.1 they explode. Well, that's how it seemed anyway...... I've gone over to the 250 watt units for my small dummy loads now. JS6TMW?
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Re: Multi band QCX plus Party time...
I've used a few of those 150 watt terminations on various heatsinks. The power rating is no joke-- on a large fan-cooled cpu heatsink they will dissipate 149.9 watts all day long. At 150.1 they explode. Well, that's how it seemed anyway...... I've gone over to the 250 watt units for my small dummy loads now. JS6TMW?
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Re: Multi band QCX plus Party time...
Thank you all for the feedback received (direct and via forum), after review of the schematic plus workings of a class E amplifier and applied 'thinking', the route I will follow IF proceeding to make QCX multiband, will be to construct dedicated receive, common band pass (L1, L2 and L3) and P.A. resonant circuit modules that are switched into circuit as required.? Have located a suitable mechanical switch from my VERY old 'junk collection' that will be ideal for the job (miniature 8p 4w rotary from Japan).
Once project completed, be it 'standard' or 'modified', I will post a picture or two together with details.
vy 73
Nigel ZS6RN ex G8DEV
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Re: Multi band QCX plus Party time...
The only thing I found on the 10W smart dummy load.
?Nick,
That LED dummy load is kit I built 10 or more years back and have long since lost the manual.
The pcb is marked such...
XTAL SET SOCIETY
10W SMART DUMMY LOAD
My web search found 'dot net' and 'dot com'
and this...
?
... but no help with my kit.
Maybe you will have more luck other than gQQgle
The high Watt resistors (image) are 300 Ohm each
Based on the low Watt resistors;
one set of 4 (1000 Ohm) and
second set of 4 ( 100 k Ohm)
?l?? >auusme<??? four of the diodes are zener ...
????? and maybe all different voltage
???? >else<? how would one 'calibrate'? 1W, 2W, 5W 10W
???? with any degree of accuracy?
?????
and other 4 diodes maybe something like 1n 4148 or 914
I also >assume<? LEDs? are? 'low'? current type
The rf ground plane (second image) prevents reverse engineering a schematic.
72 73
John
N3?AZ
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Re: Multi band QCX plus Party time...
?
Nigel,
Please l apologizes
for I wander off topic
72 73
John
N3AAZ
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Re: Multi band QCX plus Party time...
Hey John,
There is always that handy multi-meter for helping with reverse engineering efforts :0)
72 / 73,
Bill, N4QA
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Re: Multi band QCX plus Party time...
I'm working on a Mini Dummy Load, which has the same OLED display as the Nov, 2018, QST dummy load (DL):
but instead of the resistor network and quart can of mineral oil, which makes it less desirable for SOTA, IOTA, etc. work, we're using one of these:
While this says its rated at 150W, it's about the size of the first joint of your little finger and it will NOT dissipate 150W without a lot of help. This picture shows the (4") heat sink
we're adding to the back of the DL case. We tested one at 100W for about 45 seconds only to see the top half travel at the speed of light past our ears! Seriously, it literally past us before the sound got to us! We feel very safe rating it at 35W with the heat sink. It's small enough to fit in your shirt pocket, but still let you tune up politely on the air. The OLED display is driven by a Nano using essentially the same code and circuitry as the article. I have a couple of 250W units coming and will see what they can stand.
Jack, W8TEE
On Wednesday, April 17, 2019, 9:08:44 AM EDT, John Kirby <n3aaz_qrp_1@...> wrote:
?Nick,
That LED dummy load is kit I built 10 or more years back and have long since lost the manual.
The pcb is marked such...
XTAL SET SOCIETY
10W SMART DUMMY LOAD
www.midnightscience.com
My web search found 'dot net' and 'dot com'
and this...
?http://www.njqrp.club/Rainbow/rb_schem.html
... but no help with my kit.
Maybe you will have more luck other than gQQgle
The high Watt resistors (image) are 300 Ohm each
Based on the low Watt resistors;
one set of 4 (1000 Ohm) and
second set of 4 ( 100 k Ohm)
?l?? >auusme<??? four of the diodes are zener ...
????? and maybe all different voltage
???? >else<? how would one 'calibrate'? 1W, 2W, 5W 10W
???? with any degree of accuracy?
?????
and other 4 diodes maybe something like 1n 4148 or 914
I also >assume<? LEDs? are? 'low'? current type
The rf ground plane (second image) prevents reverse engineering a schematic.
72 73
John
N3?AZ
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Re: Multi band QCX plus Party time...
?Nick,
That LED dummy load is kit I built 10 or more years back and have long since lost the manual.
The pcb is marked such...
XTAL SET SOCIETY
10W SMART DUMMY LOAD
www.midnightscience.com
My web search found 'dot net' and 'dot com'
and this...
?http://www.njqrp.club/Rainbow/rb_schem.html
... but no help with my kit.
Maybe you will have more luck other than gQQgle
The high Watt resistors (image) are 300 Ohm each
Based on the low Watt resistors;
one set of 4 (1000 Ohm) and
second set of 4 ( 100 k Ohm)
?l?? >auusme<??? four of the diodes are zener ...
????? and maybe all different voltage
???? >else<? how would one 'calibrate'? 1W, 2W, 5W 10W
???? with any degree of accuracy?
?????
and other 4 diodes maybe something like 1n 4148 or 914
I also >assume<? LEDs? are? 'low'? current type
The rf ground plane (second image) prevents reverse engineering a schematic.
72 73
John
N3?AZ
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Re: Stock QCX-17 running a CW beacon on 12m again today
But, Geoff,
That key word which you used, not once, but twice...reminded me of that beautiful song by David Gates & Bread.
For that, I thank you !
"...then you & I would simply fly away !"
72 / 73,
Bill, N4QA
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Alan de G1FXB
Rick Riddle
jjpurdum