We tested it at 200W for 5 minutes without any damage or charring. The oil, however, gets pretty toasty at that power level. The code is little changed from that in the Projects book, which is available online. I can't give everything out as then there'd be little reason for QST to publish it.
Jack, W8TEE
From: M Garza <mgarza896@...>
To: [email protected]
Sent: Friday, December 22, 2017 1:47 PM
Subject: Re: [BITX20] Dummy
What is the power rating for this gem?? I have a home brew 800 watt dummy load that this would make complete!
Thanks
Marco - KG5PRT
|
We used 20 1K¦¸ metal film resistors connected in parallel. They are linked like this:
it is less expensive than the DL shown in the Projects book, which used brass sheets.
Jack, W8TEE
From: Jerry Gaffke via Groups.Io <jgaffke@...>
To: [email protected]
Sent: Friday, December 22, 2017 2:08 PM
Subject: Re: [BITX20] Dummy
Critical thing is, exactly what resistors did you use to build the 50 ohm resistor assembly? Or do we have to wait for that QST article? For those with a spare analog pin into the Raduino and an inclination for Arduino hacking, you can strip out the Nano, OLED, switch and battery from Jack's schematic. On Fri, Dec 22, 2017 at 10:26 am, Jack Purdum wrote:
It won't be a kit, but it has been accepted for publication by QST for sometime in 2018. The circuit is about as simple as it gets:
?
|
Re: In Line Resistive Terminators for Z Measurement? ?BITX Crystal Filter
Thanks for your help, John.? I was very surprised at how far the noise floor dropped once the transformers were added.? As much as I want to get the receiver working, I can feel a strong pull down the QER rabbit hole - these things are fun!? (And man - working with chip capacitors is so much faster than bending leads on disk ceramics...)
Andy
toggle quoted message
Show quoted text
On Thu, Dec 21, 2017 at 06:42 pm, John Backo wrote:
There you go, Andy. The shape is good, the 3 dB bandwidth
about 2.5 KHz, and the noise floor is even and below -60 dB.
That'll work nicely.
john
AD5YE
|
Jerry --- THANKS for the information.? ?Some day I'll be retired soon and be able to do a lotta more things....
gordon
Well, I haven't done it either.
One crystal might be worth trying, filter shape is not critical for CW.
But as you add crystals, side rejection gets better.?
We also care about far out-of-band rejection, don't want your CW filter to compromise
SSB performance.
Though could solder header pins to the uBitx around the 12mhz filter, make the CW filter
pluggable.
Easy to swap out different filter prototypes, and could remove it if necessary when
operating SSB.
Avoid capacitive coupling between filters (add shielding) and between filter sections.
I'd be suspicious of cheap factory seconds, or anything where they can't tell you the
manufacturer and part number.
You want to start out with some well matched crystals.
Jerry, KE7ER?
toggle quoted message
Show quoted text
Well, I haven't done it either.
One crystal might be worth trying, filter shape is not critical for CW.
But as you add crystals, side rejection gets better.?
We also care about far out-of-band rejection, don't want your CW filter to compromise SSB performance.
Though could solder header pins to the uBitx around the 12mhz filter, make the CW filter pluggable.
Easy to swap out different filter prototypes, and could remove it if necessary when operating SSB.
Avoid capacitive coupling between filters (add shielding) and between filter sections.
I'd be suspicious of cheap factory seconds, or anything where they can't tell you the manufacturer and part number.
You want to start out with some well matched crystals.
Jerry, KE7ER
On Fri, Dec 22, 2017 at 10:03 am, Gordon Gibby wrote:
So....what happens if you just use ONE 1.8432 MHz crystal?? ?Is that too narrow,, too wide, not enough side rejections??? Never did this before.
?
|
Farhan was on the W5KUB videocast Tuesday night (you can watch it on YouTube) and showed a whole pile of plastic boxes waiting for boards and parts. ?So it may be a while before he has a supply of finished kits ready to go. ?Mine came today. ?Ordered on the 10th.
Dave K8WPE
toggle quoted message
Show quoted text
On Dec 22, 2017, at 9:17 AM, Matt Patterson < W5llmatt@...> wrote: Hi Joe,
I don¡¯t usually post much on here but I remember seeing a notice on the main page at hfsigs saying that nothing would ship until after Christmas. ?When you order it also says that they are on Preorder. ?I don¡¯t see the announcement about shipping on their website now so maybe they are getting ready to ship the next batch out.
73 Matt W5LL Sent from my iPhone 7 On Dec 22, 2017, at 8:04 AM, Joe Rocci < joe@...> wrote: Does anyone know if there's a site to find the status of an order? I placed an order for a uBITX last week. and, aside from the immediate confirmation that the e-commerce site got my order and charged my card, there has been no feedback from HF Signals about confirmation and when the order will ship. Given the popularity this unit is likely to gain, I think regular updates about order status is important.
Joe
W3JDR
|
Re: how to coil your own cables
Years ago I used boiling water making sure that the ends were not in the water. Instead of a heat gun you could borrow the xyl hair dryer. Whatever works for you. Regards Lawrence
On Fri, Dec 22, 2017 at 4:57 PM, Doug W <KD9CYF@...> wrote: two disclaimers before this post
1) This may be common knowledge but it is new to me.
2) I am only describing what worked for me.? If you ruin your cables, your oven, your house or your marriage kindly forget you heard this from me.
I wanted coiled cables but didn't have any in my junk pile.? After some quick searching, I learned it is very easy to coil cables yourself.? I did not take pictures along the way so I will do my best to describe the process.? Take the straight cable and tape one end around something round like a dowel, pencil, knitting needle or what ever you have.? Wrap it around as long as you want taping the other end when you are done.? I used electrical tape.? You want the wraps to be snug against each other.? Next you need to heat the cable.? I read some people use hot or boiling water.? I used my oven which has a keep warm setting at 190F (about 88C).? I put the wrapped cable on aluminum foil and left it in the oven for about 45 minutes checking every 5 or 10 minutes.? You want the cable very warm to the touch but not hot.? Take it out of the oven and let it cool completely.? I think a heat gun would be easier but I don't have one.? I still shrink my shrink wrap with a lighter.? I did the one below a few weeks ago and it is still holding its shape and is still springy.?
|
If you paid by paypal you will usually get a notification when it is shipped and a tracking number. Merry Christmas to all. Regards Lawrence
On Fri, Dec 22, 2017 at 6:00 PM, Gregory Schippers <kc8hxo2@...> wrote: I ordered mine 8:30 AM EST on? the 11th. I asked HFSIGNALS if I would
make the first round on the 15th, and was asked to "be patient, and
wait 3-4 days", and they would advise. I waited 5 days, and asked for
an update, and was told it will ship in "2-3 days"..... Hope this
helps some of you with a timeline.
Regards,
Greg, KC8HXO
West Mitten
On Fri, Dec 22, 2017 at 9:18 AM, Arvo KD9HLC via Groups.Io
<arvopl=[email protected]> wrote:
> When I ordered my 40 I received no confirmation other than the PayPal
> processing like you. The radio arrived three weeks later. I was
> uncharacteristically silently patient because of all the nice things people
> say about Ashar.? That worked for me.
>
|
Many thanks for the information Jack, Hope it appears in QST for
you.
Dave
G4JBE
On 22/12/2017 18:26, Jack Purdum via
Groups.Io wrote:
toggle quoted message
Show quoted text
It won't be a
kit, but it has been accepted for publication by QST for
sometime in 2018. The circuit is about as simple as it gets:
Jack, W8TEE
Hi
Jack
Very interested in the Wattmeter side of this
project, do you have further information circuit
diagram etc
on this item or maybe available as a kit??
Dave
G4JBE
On
22/12/2017 16:04, Jack Purdum via Groups.Io wrote:
Mike:
Or,
how about 150W DL with builtin wattmeter for
under $20? This was a build our group did a
couple of months ago. The lid is shown here.
The resistor network sits in a mineral oil
bath. The downside is that this is
considerably larger than yours and a little
more expensive.
![Inline image]()
Jack,
W8TEE
|
https://twitter.com/N8DAH/status/833800940851441664
|
I used 20 1k OHM metal oxide flame proof does 50W cont 100W peak with no cooling system in place. SWR 1.6 or lower 10-80m.
|
Re: Help! I think I may have just ruined my 9 year old's Chanukah
I do that with my Bitx, when it's working, and other rigs. I also have a recording program so I can listen to the QSO. Websdr is a good tool for band conditions too. In the northeast there is a PA and a NJ SDR station that gives me, here in MA, a good reference signal.
Sent from Mike's iPad WA1MAD
|
Critical thing is, exactly what resistors did you use to build the 50 ohm resistor assembly?
Or do we have to wait for that QST article?
For those with a spare analog pin into the Raduino and an inclination for Arduino hacking,
you can strip out the Nano, OLED, switch and battery from Jack's schematic.
toggle quoted message
Show quoted text
On Fri, Dec 22, 2017 at 10:26 am, Jack Purdum wrote:
It won't be a kit, but it has been accepted for publication by QST for sometime in 2018. The circuit is about as simple as it gets:
?
|
Well, I haven't done it either.
One crystal might be worth trying, filter shape is not critical for CW.
But as you add crystals, side rejection gets better.?
We also care about far out-of-band rejection, don't want your CW filter to compromise SSB performance.
Though could solder header pins to the uBitx around the 12mhz filter, make the CW filter pluggable.
Easy to swap out different filter prototypes, and could remove it if necessary when operating SSB.
Avoid capacitive coupling between filters (add shielding) and between filter sections.
I'd be suspicious of cheap factory seconds, or anything where they can't tell you the manufacturer and part number.
You want to start out with some well matched crystals.
Jerry, KE7ER
toggle quoted message
Show quoted text
On Fri, Dec 22, 2017 at 10:03 am, Gordon Gibby wrote:
So....what happens if you just use ONE 1.8432 MHz crystal?? ?Is that too narrow,, too wide, not enough side rejections??? Never did this before.
?
|
What is the power rating for this gem?? I have a home brew 800 watt dummy load that this would make complete!
Thanks
Marco - KG5PRT
On Fri, Dec 22, 2017 at 12:43 PM, N8DAH <Dherron@...> wrote: Jack,
?Any chance at the code? I have pretty much all of that ready to go and a dummy load that would love that as a add on. Could it be used inline for active monitoring of output? I need a good meter but no radio funds outside spare parts at this time.
73
?David
|
Re: Help! I think I may have just ruined my 9 year old's Chanukah
On Fri, Dec 22, 2017 at 08:32 am, Arvo KD9HLC wrote:
Are wires touching on BitX (? or 40) toroids necessarily shorted?? Aren't the elves using enameled wire?
Shiny copper...all I had to do to fix the first one was spread them apart
|
Jack,
?Any chance at the code? I have pretty much all of that ready to go and a dummy load that would love that as a add on. Could it be used inline for active monitoring of output? I need a good meter but no radio funds outside spare parts at this time.
73
?David
|
It won't be a kit, but it has been accepted for publication by QST for sometime in 2018. The circuit is about as simple as it gets:
Jack, W8TEE
From: David Lacey via Groups.Io <g4jbe@...>
To: [email protected]
Sent: Friday, December 22, 2017 11:11 AM
Subject: Re: [BITX20] Dummy
Hi Jack
Very interested in the Wattmeter side of this project, do you have
further information circuit diagram etc
on this item or maybe available as a kit??
Dave
G4JBE
On 22/12/2017 16:04, Jack Purdum via
Groups.Io wrote:
Mike:
Or, how about
150W DL with builtin wattmeter for under $20? This was a build
our group did a couple of months ago. The lid is shown here.
The resistor network sits in a mineral oil bath. The downside
is that this is considerably larger than yours and a little
more expensive.
![Inline image]()
Jack, W8TEE
|
Thanks!
I have now joined and downloaded the Discord app for PC, makes it easier to keep open when not using the browser, and of course folk can ring me too!
73 Steve
G1KQH
|
We ran this one at 200W for 5 minutes and nothing failed...didn't even discolor the resistors. However, you could cook French fries in the oil.
Jack, W8TEE
From: Michael Hagen <motdog@...>
To: [email protected]
Sent: Friday, December 22, 2017 11:18 AM
Subject: Re: [BITX20] Dummy
It was designed with
Bit in Mind.
I saw someone post the
QRP Labs one???? So I thought I would show a better one.? ha..
This looked real good
on the SA for return loss.
Its perfect for bit,?
you never tune long enough to hurt it?? And you can stick it
right out the back with the BNC Adaptor.
The biggest cost is
the BNC connectors.
Stick in your coffee
cup too, to reheat the Java!
I still have the
Heathkit Can -Tenna somewhere?? I remember the can rotted out,
I had to go to the paint store
and buy a new gallon
paint can.? I used to tune the SB220 into it.? I think I put
Automatic Transmission Fluid in it.
Mike, WA6ISP
On 12/22/2017 8:04 AM, Jack Purdum via
Groups.Io wrote:
Mike:
Or, how about
150W DL with builtin wattmeter for under $20? This was a build
our group did a couple of months ago. The lid is shown here.
The resistor network sits in a mineral oil bath. The downside
is that this is considerably larger than yours and a little
more expensive.
![Inline image]()
Jack, W8TEE
Hey,
speaking of Dummies.? Here is one I came up with.
Its 4 -? 3W resistors.? Has RF tap (0602 Component)
either for a resistor or Cap.
Shky diode and cap.? Place for LED (0805).? 3 Pin
Molex for output monitoring.
You will have to fiddle with the values.?? Layout
has lots of ground plane, both side of the PCB.
And you need the Male BNC Adaptor to go to the back
of the Bit.
I got lots of PCB, $4 or Kit $12 (Includes BNC
Adaptor, shipping, Paypal) US.
PCB can be shipped in and envelope, but the Kit gets
a small box.
email me for more info
73's
Mike, WA6ISP
--
Mike Hagen, WA6ISP
10917 Bryant Street
Yucaipa, Ca. 92399
(909) 918-0058
PayPal ID "MotDog@..."
Mike@...
--
Mike Hagen, WA6ISP
10917 Bryant Street
Yucaipa, Ca. 92399
(909) 918-0058
PayPal ID "MotDog@..."
Mike@...
|
Re: ordering a replacement raduino
?OK,? I think I sent it....paypal just sent me a confirmation.
I think they might charge you a fee, so I upped the $$ to 32.00
Let me know if I need to do anything else.....
I'm pretty new at that paypal stuff other than using it on Ebay.
Thanks!!!!
Gordon
toggle quoted message
Show quoted text
OK,
PayPal ID "MotDog@..."
I can take it to the PO tomorrow morning?
Thanks,
Mike
On 12/22/2017 10:08 AM, Gordon Gibby wrote:
Actually, for my application, I can use either!
thanks for pointing??it out,
gordon gibby
This is a uBit Raduino, different from orginal Raduino.
I think he wants the RaduinoX that is a dropin for Raduino.?
Mike, WA6ISP
On 12/22/2017 9:57 AM, Gordon Gibby wrote:
?woo hoo!!!? ?If that fellow who needed one badly doesn't take it...I'll be GLAD to take it off your hands...learned how to send money via PayPal just recently....
email is
ggibby@...
Gordon?
I have a uBit Raduino to find a home.
It has never been installed, I did plug it into USB.? With LCD too.
$29 Shipped US.
On 12/22/2017 9:28 AM, Michael Hagen wrote:
Much Better Raduino,
I also have The RaduinoXP (Mega Pro Based), it is larger, my not fit what you have boxed up?
I still have lots of Raduino X bare PCBs and completed boards. In case you blew up stock Raduino or want to make alternate projects.
I have sold a dozen or so, but ordered 50 PCBs.
For those wanting a Raduino board.
There is a better option than the orginal Raduino board with it Soldered
- in Nano.
RaduinoX? PCB designed to add some features.
I have Lots of Bare PCBs and some assembled and tested.? Lots of Bare PCBS!
Several sold to guys in this group.
I used this board, LCD, and Rotary Encoder to make a nice dedicated RF
signal generator.
1) I wanted to be able to plug Nano in and out, not soldered. I wanted
the USB connect next to the side of the cabinet so I can program without
taking the lid off.? I will make a small hole.
2) Added, diode protection, more filtering and conditioning on the power
input.? Regulator is bolted down.
3) Added a dedicated connector for Rotary Encoder with pullups and
bounce capacitors.
4) Added an I2C connector.
5) I wanted proper Level Shifting to the Si 3V part.? Added FETs and
pullups for that.?? Original did not do that.
6) Added D0 and D1 pins on PCB.
7) Kept power and VFO connector on 5P header so no changes to my present
wiring was necessary.
8) Put contrast Pot where you can get to it.
9) Complete documentation.
10) Fits original LCD perfectly.
Take a look if you are interested.
motdog@verizon dot net
Mike, WA6ISP
--
Mike Hagen, WA6ISP
10917 Bryant Street
Yucaipa, Ca. 92399
(909) 918-0058
PayPal ID "MotDog@..."
Mike@...
--
Mike Hagen, WA6ISP
10917 Bryant Street
Yucaipa, Ca. 92399
(909) 918-0058
PayPal ID "MotDog@..."
Mike@...
--
Mike Hagen, WA6ISP
10917 Bryant Street
Yucaipa, Ca. 92399
(909) 918-0058
PayPal ID "MotDog@..."
Mike@...
|
David Wilcox K8WPE
N8DAH