John AE5X writes: I also agree with the "if it hasn't been used in 5 years" rule. For some of us, 5 year old excess parts are darn near brand new. Should be expanded as follows: Class A - the five year rule Class B - hasn't been used since Y2K Class C - hasn't been used (or even made) since the Nixon administration For clarity, my Class C boxes contains knife switches, mercury vapor rectifiers, bakelite terminal strips, nixie tubes, and IF cans the size of a salt shaker. Seriously, a cheap way to exchange or trade parts is a good idea. Few of us are probably concerned about recovering any investment - just want to see things put to use. Maybe a future activity for a hamfest or QRP gathering. Set out your goodies. "I'll trade you a couple of BNC connectors for that NE602 and MV209 tuning diode." I suppose an online group could do the same. Wonder if any of those old nixie tubes are still good? Hmmm... 72, Paul NA5N
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I have some stuff to contribute as well for the price of shipping. Better to see it used by someone than sit around here gathering dust. Excellent idea and I also agree with the "if it hasn't been used in 5 years" rule.
73,
John AE5X
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John,
I'm sure there are some that will take you up on your offer.
I brought up the stamp + envelope as a way for me to get
back to getting rid of 'stuff' and downsizing the lab.
Isn't there some written rule somewhere in the Universe that
says, "If you haven't used it in 5 years or more, it's time
to get rid of it."?? (English majors pass out on the delimiters.)
Here is a brilliant idea from the lab.
Some one start the "QRP Dollar Club" on groups.io.? Your job is
to get all interested parties that are willing to share spare
parts for the cost of the stamp and envelope.? A measly buck.
Less money than it costs to drive 10 miles to a restaurant
and get parts from a friend.? I suggest the new group in order
to take a special interest group (SIG) to their own site for
daily business.? I will join and I will contribute.? No one
is going to make money and we will save Flipper and turtles
from stuff in the landfills and along side the roads.? Hopefully.
You will have to have a file online with a list of the contributors
and what is available and updated when the offer expires.
Hey.? I may even have some PCBs for shipping costs.? I've ordered
by 100 envelopes and will let you know when I get them and the
stamps and I'll start shipping the first of next week.? I'll
run a couple of free offers to a few people to test the USPS
system out.? I'll post.
We are becoming a civilization where just about everything is
coming to your door now and you don't have to leave the comfort
of your double wide to get stuff.? Whether you need it or not.
I have a few thousand 2N2222A's to become available, but I
think the Chinese can beat the price.
They can, but maybe we can get it to you faster.? :-)? "No boats
used in the transport of these parts."
But there may be other stuff hard to find to push out the door.
Just an idea and to be taken as such.
chuck, k7qo
PS.? Maybe OT, but we all need parts for projects and this is
just another way to help guys and girls out.
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On 7/22/19 5:09 PM, jdjr.bailey@... wrote: Chuck,
I saw Diz' email earlier and now I've got 100 MPSH10's ordered and headed to me in North San Diego. This will be way more than I will ever use and I'm more than happy to share if anyone is nearby.
John, km6zar
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Chuck,
I saw Diz' email earlier and now I've got 100 MPSH10's ordered and headed to me in North San Diego. This will be way more than I will ever use and I'm more than happy to share if anyone is nearby.
John, km6zar
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OK, I way over charged you for the envelope.
Found on ebay and US shipper:
$11.97 per 100pcs with free shipping.
We can keep Diz in business now by paying him
a buck for his cost to ship the missing part(s).
He can't do this without our help.? IMHO.
I'm not trying to create work for him with this
posting.? Hoping here to help both sides of the
complex equation.
chuck, k7qo, he who does not run a business and never will
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There is a way to use the USPS system.
I think I have news, but then I may not.
I ordered two microSD cards for a Raspberry Pi 4
project last week and I got the envelope today.
It is a 18.0cm by 12.25cm padded envelope with thin
bubble padding on the inside and a search will have
to be done to find the source.
Two things.? A rubber stamp was used with red ink
to mark the envelope as NON-MACHINABLE (not shouting
here, but it is all caps so the USPS will see it).
The stamp used costs $0.72 USD at the present time
and they are like forever stamps.
or
in URL format.
I'll go back to the 4.096MHz project in a few days to see if it
is possible.? Weight has to be under 1.00000 oz.? :-)
FYI
chuck, k7qo
PS.? I'm guessing the envelopes won't be cheap, i.e. under the cost
of the stamp.
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Thanks for all the replies. I already had the calculator downloaded and
forgot about it
The core is wound.
72,
Jimmy, W9JDH
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On Sat, Jul 20, 2019 at 8:31 PM Dave <dave@...> wrote: When I enter T68-7 and 60 turns, the mini Ring Core Calculator show
18.7uH. It also says the max wire size is 25 gage. So, 26ga would be
tight, anything smaller would be good unless too much current will be used.
Dave - WB6DHW
On 7/20/2019 12:45 PM, Shirley Dulcey KE1L wrote:
The wire size of a toroid affects its inductance and Q. Those effects
are small and the values in most circuits aren't sufficiently critical
for them to matter. The toroid cores are not precision components, and
wire winding technique also changes inductance. Stepping up or down a
size or two from the recommended one will usually work just fine so
long as the turns fit.
Wire size also affects current handling capacity. It's not likely to
matter in any QRP design, but don't use tiny wire if you build a QRO
radio or tuner!
On Sat, Jul 20, 2019 at 3:02 PM Alan Jones <oalanjones@...> wrote:
As long as you can get the number of turns on the toroid you should be
good to go.
Alan, N8WQ
On Sat, 20 Jul 2019 13:40:47 -0400, JD Hill <w9jdh.qrp@...> wrote:
I'm I have some enameled wire that is smaller than #26 .... I am
guessing
probably #28 or 30.
My question is: can I use the wire I already have or do I have to
obtain
the specific wire called for in the parts list?
Can
On Sat, Jul 20, 2019, 11:54 AM JD Hill via Groups.Io~9jdh.qrp=
[email protected]> wrote:
How critical is the wire size when winding a toroid?.
Specifically... I have to wind a T68-7 core with 60 turns of #28
enamel
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MicroMetals produces a document called Q Curves of powdered iron cores. I see it can be downloaded at;
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Ed is correct about the operating frequency ranges. This website is also a wealth of info:
Peter
KF7PSM
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Re: LTSpice Missing CPL Model?
Hi... Could be of interest. Also getting to some grips of LTspice..
Not enough lifetimes
73 Ken G3UDA
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On Mon, Jul 22, 2019 at 05:28 AM, Jack wrote:
I doubt that many of us really appreciate the work he puts in while creating
one of these manuals.
Not to mention the multi-part video series he does for lots of his projects. I bet at least half of what I know or can build is a direct result of Chuck's videos!
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Re: LTSpice Missing CPL Model?
Regarding the error ... if you're trying to write the pulse statement directly, you may need to associate it with a source and nodes. I looked at my Netlist and see this statement: V1 N001 0 PULSE(0 5 0 10n 10n 500n 1u) 72 again, Nick, WA5BDU On Mon, Jul 22, 2019 at 8:03 AM Nick Kennedy via Groups.Io <kennnick= [email protected]> wrote: Hi Chuck -
You're trying to generate a square wave? I add the voltage source, right
click on it, choose "advanced", check "Pulse" and fill out the table like
this:
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Re: LTSpice Missing CPL Model?
Hi Chuck -
You're trying to generate a square wave? I add the voltage source, right
click on it, choose "advanced", check "Pulse" and fill out the table like
this:
(I'm figuring a 1 MHz square wave, 0 to 5 volts, 10 ns rise and fall times.)
Vinitial 0
Von 5
Tdelay 0 (or blank)
Trise 10n
Tfall 10n
Ton 500n
Tperiod 1u
Ncycles (blank)
It produces this spice statement next to the source:
PULSE(0 5 0 10n 10n 500n 1u)
I hope this helps.
73-
Nick, WA5BDU
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On Mon, Jul 22, 2019 at 6:49 AM Chuck Carpenter <w5usj@...> wrote: I'm attempting(?) to model a circuit that uses square wave input.
I've looked at LTSpice tutorials and searched the web and haven't
found anything that works for the .pulse directive.
I get this box when I try a "Run"...
Emacs!
I've used all of the components and their models in other
circuits. Any suggestions, ideas, what's needed...
Thanks.
|
Me too, on everything. I'm building a 5W and am using Chuck's manual as I build. I doubt that many of us really appreciate the work he puts in while creating one of these manuals. Think about it: Place one component, take a picture, crop the picture, write the narrative, and insert it into the manual...repeat for 200 pages!. Having done some writing myself, I know the effort it takes to do something like this...and he charges us nothing! Same for the videos. All of us are standing on his shoulders and we owe him a lot.
Thanks, Chuck, your efforts are sincerely appreciated...
72,Jack, W8TEE
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On Monday, July 22, 2019, 5:18:12 AM EDT, David Wilcox via Groups.Io <Djwilcox01@...> wrote: I, a kit builder, second all the accolades!? Thank you so much!!! I loved the ¡°I burn up more rolls of solder than log books¡± comment. David J. Wilcox K8WPE¡¯s iPad On Jul 22, 2019, at 2:07 AM, k6whp <k6whp@...> wrote:
Diz,
I am going to ramble here so I proffer my apologies in advance.
Do not get yourself down about these trivial oversights. Ya done good with the 1Watters and 5Watters. For about $55 you got us close to two decent radios and kept us junkies going with the part of the hobby -- building -- we love so dearly. ("I burn up More rolls of solder that log books" -- isn't that how it goes?) Besides, Dave Benson brought us the magical SW-##+ series for about that price and it did not have a keyer chip on board. Also,we are two decades down the road from then so surely adjusted for inflation, these two kits are bargains. That I have to dive into my stash for a lousy NPN or an SMD LM386 is an adventure not a pain in the ass.
As for the replacement of the Q8 with a 2N3904, I recall we did that with something similar back with the NorCal 40A build. Also, I remember Chuck telling us that that project was all about teaching us liberal arts and business administration and software developer types how to gather a junk box and scrounge therefrom.
I could go on but, while I am at it, Chuck is unnecessarily beating himself up about no one watching the magnificent videos he produces. Well, I am sure that there's not the audience on YouTube for that content versus the swill and drek that gets pumped out there for the mindless mouth-breathing proles, but measured in appreciation, these are treasures! It is a privilege to have Chuck memorialize his thoughts, advice, recommendations, and methods and make them available to us for free. I have built several radios using these videos and value what I have learned. It's kind of like getting an EE without all the bravo sierra.
And don't get me started on the incredible manuals and references he has produced (and the data you have made available on your website).
We are lucky to have you both as resources; maybe our appreciation and gratitude will mitigate the frustration somewhat.
Sorry for the rant.
--
William, K6WHP
"Cheer up, things could get worse..so I cheered up and, sure enough, things got worse!"
|
LTSpice Missing CPL Model?
I'm attempting(?) to model a circuit that uses square wave input.
I've looked at LTSpice tutorials and searched the web and haven't found anything that works for the .pulse directive.
I get this box when I try a "Run"...
Emacs!
I've used all of the components and their models in other circuits. Any suggestions, ideas, what's needed...
Thanks.
|
I, a kit builder, second all the accolades! Thank you so much!!!
I loved the ¡°I burn up more rolls of solder than log books¡± comment.
David J. Wilcox K8WPE¡¯s iPad
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On Jul 22, 2019, at 2:07 AM, k6whp <k6whp@...> wrote:
Diz,
I am going to ramble here so I proffer my apologies in advance.
Do not get yourself down about these trivial oversights. Ya done good with the 1Watters and 5Watters. For about $55 you got us close to two decent radios and kept us junkies going with the part of the hobby -- building -- we love so dearly. ("I burn up More rolls of solder that log books" -- isn't that how it goes?) Besides, Dave Benson brought us the magical SW-##+ series for about that price and it did not have a keyer chip on board. Also,we are two decades down the road from then so surely adjusted for inflation, these two kits are bargains. That I have to dive into my stash for a lousy NPN or an SMD LM386 is an adventure not a pain in the ass.
As for the replacement of the Q8 with a 2N3904, I recall we did that with something similar back with the NorCal 40A build. Also, I remember Chuck telling us that that project was all about teaching us liberal arts and business administration and software developer types how to gather a junk box and scrounge therefrom.
I could go on but, while I am at it, Chuck is unnecessarily beating himself up about no one watching the magnificent videos he produces. Well, I am sure that there's not the audience on YouTube for that content versus the swill and drek that gets pumped out there for the mindless mouth-breathing proles, but measured in appreciation, these are treasures! It is a privilege to have Chuck memorialize his thoughts, advice, recommendations, and methods and make them available to us for free. I have built several radios using these videos and value what I have learned. It's kind of like getting an EE without all the bravo sierra.
And don't get me started on the incredible manuals and references he has produced (and the data you have made available on your website).
We are lucky to have you both as resources; maybe our appreciation and gratitude will mitigate the frustration somewhat.
Sorry for the rant.
--
William, K6WHP
"Cheer up, things could get worse..so I cheered up and, sure enough, things got worse!"
|
Diz,
I am going to ramble here so I proffer my apologies in advance.
Do not get yourself down about these trivial oversights. Ya done good with the 1Watters and 5Watters. For about $55 you got us close to two decent radios and kept us junkies going with the part of the hobby -- building -- we love so dearly. ("I burn up More rolls of solder that log books" -- isn't that how it goes?) Besides, Dave Benson brought us the magical SW-##+ series for about that price and it did not have a keyer chip on board. Also,we are two decades down the road from then so surely adjusted for inflation, these two kits are bargains. That I have to dive into my stash for a lousy NPN or an SMD LM386 is an adventure not a pain in the ass.
As for the replacement of the Q8 with a 2N3904, I recall we did that with something similar back with the NorCal 40A build. Also, I remember Chuck telling us that that project was all about teaching us liberal arts and business administration and software developer types how to gather a junk box and scrounge therefrom.
I could go on but, while I am at it, Chuck is unnecessarily beating himself up about no one watching the magnificent videos he produces. Well, I am sure that there's not the audience on YouTube for that content versus the swill and drek that gets pumped out there for the mindless mouth-breathing proles, but measured in appreciation, these are treasures! It is a privilege to have Chuck memorialize his thoughts, advice, recommendations, and methods and make them available to us for free. I have built several radios using these videos and value what I have learned. It's kind of like getting an EE without all the bravo sierra.
And don't get me started on the incredible manuals and references he has produced (and the data you have made available on your website).
We are lucky to have you both as resources; maybe our appreciation and gratitude will mitigate the frustration somewhat.
Sorry for the rant.
--
William, K6WHP
"Cheer up, things could get worse..so I cheered up and, sure enough, things got worse!"
|
The -6 and -2 identify different mixes for the ceramic formula. They not only have different Q,s and different inductance per turns, they also have different optimum operating frequencies. Spend some time on this web site: <>
Ed
AB8DF
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On Jul 21, 2019, at 11:27 AM, Peter Filiberti <kf7psm@...> wrote:
Sometimes you only have say a yellow T37-6 vs a red T37-2. Can it be used? Yes but you have to adjust the # of turns and then you also have to judge if the new number of turns will fit on the toroid. I found the attached information very useful.
<toroid_data.pdf><toroid_inductance_chart.pdf>
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Is there a website that explains designing with toroids? It's not really necessary. Anything that can be done with a toroid inductor can be done with an air-wound coil. Toroids are preferred because most of their fields are maintained inside the ring-shaped core, meaning they produce much less interference to other inductors. They are also small and provide good Q, as you use much less copper wire for a given inductance than if you were to make a solenoid coil. Is there a tool for calculating inductance? Click on the toroid core you have and then have fun. Ed AE7TE
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Is there a website that explains designing with toroids?
Is there a tool for calculating inductance?
Bob Macklin
K5MYJ
Seattle, Wa.
"Real Radios Glow In The Dark"
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----- Original Message ----- From: "Peter Filiberti" <kf7psm@...> To: < [email protected]> Sent: Sunday, July 21, 2019 8:27 AM Subject: [qrp-tech] Toroid Info Sometimes you only have say a yellow T37-6 vs a red T37-2. Can it be used? Yes but you have to adjust the # of turns and then you also have to judge if the new number of turns will fit on the toroid. I found the attached information very useful.
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va3rr
Nick Kennedy
Jack
David Wilcox K8WPE
J Ed