|
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:
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.
Jack, W8TEE
From: Michael Hagen <motdog@...>
To: [email protected]
Sent: Friday, December 22, 2017 10:59 AM
Subject: Re: [BITX20] Dummy
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@...
|
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:
toggle quoted message
Show quoted text
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.
Jack, W8TEE
|
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.
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@...
|
You can buy the
wattmeter IC on eBAY or buy the whole board.? I don't remember,
AD?
I think I got the IC
for about $1.?? I got it to track fairly well from 0 to -40
dBm.
I was using an HP
function generator at 10 MHz.?? Nice, you can dial in dBm
directly.
You would have to make
a pi or t pad in front of them.? Reduce the power.
I used the Arduino to
read them.
The info is on the
net.? Search eBay too.
73's
Mike, WA6ISP
On 12/22/2017 8:12 AM, David Lacey via
Groups.Io wrote:
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.
Jack, W8TEE
--
Mike Hagen, WA6ISP
10917 Bryant Street
Yucaipa, Ca. 92399
(909) 918-0058
PayPal ID "MotDog@..."
Mike@...
|
I`ll take a google around and see if I can find one. Thanks for the
info Mike, I`m thinking they could
be useful!
Dave
G4JBE
On 22/12/2017 16:25, Michael Hagen
wrote:
toggle quoted message
Show quoted text
You can buy the
wattmeter IC on eBAY or buy the whole board.? I don't
remember, AD?
I think I got the IC
for about $1.?? I got it to track fairly well from 0 to -40
dBm.
I was using an HP
function generator at 10 MHz.?? Nice, you can dial in dBm
directly.
You would have to
make a pi or t pad in front of them.? Reduce the power.
I used the Arduino
to read them.
The info is on the
net.? Search eBay too.
73's
Mike, WA6ISP
On 12/22/2017 8:12 AM, David Lacey
via Groups.Io wrote:
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.
Jack, W8TEE
--
Mike Hagen, WA6ISP
10917 Bryant Street
Yucaipa, Ca. 92399
(909) 918-0058
PayPal ID "MotDog@..."
Mike@...
|
Are you referring to the AD-8307 ??
Vince.
toggle quoted message
Show quoted text
On 12/22/2017 11:25 AM, Michael Hagen wrote: You can buy the wattmeter IC on eBAY or buy the whole board. I don't
remember, AD?
I think I got the IC for about $1. I got it to track fairly well from
0 to -40 dBm.
I was using an HP function generator at 10 MHz. Nice, you can dial in
dBm directly.
You would have to make a pi or t pad in front of them. Reduce the power.
I used the Arduino to read them.
The info is on the net. Search eBay too.
73's
Mike, WA6ISP
On 12/22/2017 8:12 AM, David Lacey via Groups.Io wrote:
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
--
Mike Hagen, WA6ISP
10917 Bryant Street
Yucaipa, Ca. 92399
(909) 918-0058
PayPal ID "MotDog@..."
Mike@...
--
Michigan VHF Corp.
|
Yes, I was too busy to
go get my schematics out.? I bought 10 from eBay.? Don't know
if they are real ones?
I have them on one of
my boards, seem to work OK.
There are more (newer)
models now.? But expensive buying from a distributor.
Mike
On 12/22/2017 9:43 AM, Vince Vielhaber
wrote:
Are
you referring to the AD-8307 ??
Vince.
On 12/22/2017 11:25 AM, Michael Hagen wrote:
You can buy the wattmeter IC on eBAY or
buy the whole board.? I don't
remember, AD?
I think I got the IC for about $1.?? I got it to track fairly
well from
0 to -40 dBm.
I was using an HP function generator at 10 MHz.?? Nice, you can
dial in
dBm directly.
You would have to make a pi or t pad in front of them.? Reduce
the power.
I used the Arduino to read them.
The info is on the net.? Search eBay too.
73's
Mike, WA6ISP
On 12/22/2017 8:12 AM, David Lacey via Groups.Io wrote:
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
--
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@...
|
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@...
|
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
|
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
|
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
|
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:
?
|
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.
|
https://twitter.com/N8DAH/status/833800940851441664
|
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
|
We used 20 1KΩ 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:
?
|
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
|
Have u got the sketch for that Jack and also can any other diode be used
On 23 Dec. 2017 5:26 am, "Jack Purdum via Groups.Io" <jjpurdum= [email protected]> 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:
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
|
toggle quoted message
Show quoted text
On 23 Dec. 2017 5:26 am, "Jack Purdum via Groups.Io" <jjpurdum= [email protected]> 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:
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
|
N8DAH