Date   

SSS is coming up

John Lonigro
 

This Sunday, March 12th, is the monthly Second Sunday Sprint (SSS). Don't forget to set your clocks forward if you observe Daylight Saving Time in your area. The Sprint starts at 7:00 pm (CDT) and runs for 2 hours. That's 8:00 EDT and 5:00 PDT (if I did my math correctly). Go to 4SQRP.com and click on "on air activities" or else go to qrpcontest.com. Either one will point you to the Sprint rules. You must log your entries on the qrpcontest.com site.

We had something like 14-15 participants in February. Let's try for closer to 20 in March. That would be fantastic and would give me another opportunity to mess up reporting the results (hi).

Don't forget to search for the Bayou Jumpers, all pretty much located below 7122.

As an advanced warning, the APRIL SSS falls on Ozarkcon weekend. I'm not going to mess around with trying to change the date of the Sprint to an alternate weekend. Most people should be back at their QTH by Sunday night anyway.

72,

John, AA0VE
4SQRP Contest Coordinator


Re: Small Wonder PSK-20 mods to USB and addiing DDS Vfo

John Kirby
 


Re: BJ

Paul Smith
 

Glad to hear Everett,

Ill be listening just below 7122 for you!

de Paul N0NBD


Sent from Outlook




From: 4sqrp@... <4sqrp@...> on behalf of Everett Catlin everettcatlin@... [4sqrp] <4sqrp@...>
Sent: Sunday, March 5, 2017 12:43 AM
To: BayouJumper; 4SQRP Mailing List
Subject: [4sqrp] BJ
 
 

received Bayou Jumper in mail today. Will start on it next week.  I want to thank Larry AB0AH

72

Everett Catlin n5mzx


Re: uBITX Transceiver

Bry Carling <af4k@...>
 

I think this Arduino and "Simple Programming in C" is for a LIMITED number of hams who are inclined to do that sort of thing!!


That web site has some odd mistakes:


IT SAYS:

"tested SSB transceiver module, covering any 400 KHz segment of the 7 MHz band"

Gee Wally - WHICH 400 kHz segment should I choose?


72.5 de AF4K, Bry



From: 4sqrp@... <4sqrp@...> on behalf of James Vroman james@... [4sqrp] <4sqrp@...>
Sent: Friday, March 3, 2017 1:16 PM
To: 4sqrp@...
Subject: Re: [4sqrp] uBITX Transceiver
 
 

Check out
http://www.hfsigs.com
It is a partially built Bitx40 kit.

James "Chewy" Vroman

On Mar 3, 2017 9:39 AM, "Tim McDonough N9PUZ tim.n9puz@... [4sqrp]" <4sqrp@...> wrote:
>
>
> I ran across this earlier today. Looks like an interesting project.
>
>
>
> Tim N9PUZ
>
>
> ------------------------------------
> Posted by: Tim McDonough N9PUZ > ------------------------------------
>
> 4SQRP Website: http://4sqrp.com
> Plan to attend OzarkCon on - April 1-2, 2016
> View Details at http://www.ozarkcon.com/index.php
> ------------------------------------
>
> Yahoo Groups Links
>
>
>


Small Wonder PSK-20 mods to USB and addiing DDS Vfo

Dean Calvin
 

Hello all, I am new to the group. 


I am looking for info concerning moding the PSK-20 for USB and adding a DDS vfo.


Any info is appreciated! 


73  de N8YA,


Dean 


BJ

Everett Catlin <everettcatlin@...>
 

received Bayou Jumper in mail today. Will start on it next week.  I want to thank Larry AB0AH

72

Everett Catlin n5mzx


Looking for QRP rig.

Dave Belville
 

I am looking for a qrp rig for use as a permanent QRP setup in my shack. I have a KX2 and a couple other QRP rigs but I would like something like an Icom IC-703 Plus that does all of the HF bands. If you have something in good working order that you no longer need and would consider selling it, please email me off list at davebelville-at-yahoo-dot-com.


Thank you,


Dave, KD9VT


OzarkCon

Aaron K5ATG
 

I need to talk to someone about some information about OzarkCon, who would be a good person for that? 


cyclone40

Barney Jones
 

Hello! was wondering if anyone had a Cyclone40 that they had never built?


OZARKCON rooms

Johnny AC0BQ
 

Good afternoon Group
I just called and made my room reservation for 
Ozarkcon and they are nearly booked full!!
They said that they were fully booked for Friday 
And getting close for Saturday night.
So if you haven't called them you might have to stay elsewhere??
72
Johnny AC0BQ 
--
Sent from Gmail Mobile


Re: uBITX Transceiver

Tim N9PUZ
 

Yes. Same designer I believe. Perhaps they will kit the uBITX at some point. I recently got a BITX40 kit but have not finished it out yet.

Tim N9PUZ

On 3/3/2017 12:16 PM, James Vroman james@vroman.com [4sqrp] wrote:

Check out
http://www.hfsigs.com
It is a partially built Bitx40 kit.

James "Chewy" Vroman

On Mar 3, 2017 9:39 AM, "Tim McDonough N9PUZ tim.n9puz@gmail.com
[4sqrp]" <4sqrp@yahoogroups.com> wrote:

I ran across this earlier today. Looks like an interesting project.

<http://www.phonestack.com/farhan/ubitx/ubitx.html>

Tim N9PUZ


Re: uBITX Transceiver

James Vroman AC0BN
 

Check out
http://www.hfsigs.com
It is a partially built Bitx40 kit.

James "Chewy" Vroman

On Mar 3, 2017 9:39 AM, "Tim McDonough N9PUZ tim.n9puz@gmail.com [4sqrp]" <4sqrp@yahoogroups.com> wrote:


I ran across this earlier today. Looks like an interesting project.

<http://www.phonestack.com/farhan/ubitx/ubitx.html>

Tim N9PUZ


------------------------------------
Posted by: Tim McDonough N9PUZ <tim.n9puz@gmail.com>
------------------------------------

4SQRP Website: http://4sqrp.com
Plan to attend OzarkCon on - April 1-2, 2016
View Details at http://www.ozarkcon.com/index.php
------------------------------------

Yahoo Groups Links



Re: uBITX Transceiver

wa2cky
 

Thanks for the link.  Very interesting radio. Passed the link along to friend in Alabama who is considering a simple 80/40M SSB transceiver.

73
Bob Groh, WA2CKY


Test

Rick Bennett
 

Seem to be having trouble.  No need to respond.



uBITX Transceiver

Tim N9PUZ
 

I ran across this earlier today. Looks like an interesting project.

<http://www.phonestack.com/farhan/ubitx/ubitx.html>

Tim N9PUZ


Re: Some advice please

Rick Bennett
 

I would use what you have on hand.  Just about anything works for a small relay.  As some have pointed out, for larger relays something with more current capacity would be better.  I have used "mystery diodes" from my junk box for this purpose.

de KC0PET, Rick



From: "Wayne Dillon wayne.dillon@... [4sqrp]" <4sqrp@...>
To: 4sqrp@...
Sent: Thursday, March 2, 2017 12:38:59 PM
Subject: [4sqrp] Some advice please

 

GA all,
I'd like top know if the diode I use across a relay coil matters. I.e I would normally use a 1N4001 but I have access to a bunch of 1N4148s, does it matter which I use?...
over to you all...
Blessings,
Wayne - NQ0RP

--
 
QRP -  EFFICIENCY AND SKILL, NOT POWER. 
 
I'm British by birth but American by CHOICE!

Jesus came to pay a debt He didn't owe because we owe a debt we cannot pay...

The Lord bless you and keep you
The Lord make His face shine upon you, and be gracious unto you
The Lord lift up his contenance upon you and give you peace.

God Bless from Wayne Dillon - NQ0RP

Joshua 24:14-15
2 Cor 5:17
1 Jn 2:17
 
NAQCC MWN NCS
NAQCC Net manager
NAQCC # 0759
Membership Chairman - 4SQRP Group
4SQRP 40m NCS
4SQRP #95
FISTS 17184
FPQRP #342 (Flying Pigs QRP Club)
G-QRP-11504
QRP-ARCI #11505
SKCC #1155T
SOC #848
30MDG#1176
NEQRP #693
GORC #192
DMC (Digital Modes Club) # 06686
Zombie# 1186



Re: OzarkCon Alert: Special Prize Package after the 60 Minute Circuit Board presentation

davemrtn
 

Nick,

    Looking forward to the presentation by you and Jim.

    I also hope to get some pointers about generating gerber output and any required/normal settings for same.

See Ya in a month....

David Martin - NA1MH - Mountain Home, Ar. -----------------------------------------

On 3/2/2017 19:56, 'Nick Kennedy' nick-wa5bdu@... [4sqrp] wrote:
 

I’m really happy to be part of the toner transfer presentation, but N5IB is actually the lead man on the effort.
 
I’ve gotten into this discussion late and have seen some good pro and con opinions.
 
The cost is a big one. It takes a lot to pry me loose from a dollar, so I wanted to be sure I was getting into something that would work for me. I checked out Chuck’s videos and read comments on QRP-Tech, plus bugged Jim N5IB with questions.
 
The biggies are a Laser printer and a laminator.  I was surprised that the printer was less than $60. And it has other value in my shack (as a printer, of all things). It prints faster and cheaper than the color inkjet. The laminator I only use for PCB work. Can it cook a grilled cheese sandwich?  I don’t know. I bit the bullet and bought the nice Apache laminator. I may have saved some money with another brand but I decided to go with the one with the best reviews.
 
I had kind of reached a limit on PCB complexity using my typical Manhattan and Ugly methods. Yes, you can do complex stuff in Manhattan like the 2N2/40 if you have the skills of K8IQY or NA5N.  My boards just grow and get unwieldy and collapse under their own weight and chaotic layout. Doing a layout with ExpressPCB enforces a kind of structure on me. I must complete the layout before I can start building. I’d have never gotten the complex boards for my phasing receiver done without the transition to doing my own boards this way.
 
As far as the “fab houses” go – it’s hard to imagine that I won’t eventually give them a go. Right now I don’t have anything that will output Gerber and learning the rules of Gerber will be a new task for me. Possibly a couple of downsides ... If there’s a limit of ten or even three boards, do I need that many?  If I make a major mistake, I’ve made it triplicate (or tenfold). Corrections are easier here in my home mad scientist’s laboratory.
 
I think if I were using through-hole parts I’d probably want to use a fab house – who wants to drill all those holes?  But I’ve become completely sold on SMT and/or converting conventional parts to SMT in the manner of Pittsburgh or Chuck’s “Muppet” method.  (Or Manhattan, for that matter). SMT is easier to probe and test, easier to remove and replace parts, easier to make minor corrections to the circuit.  Most of the stuff I do is being done “for the first time” (at least by me), so I need to be able to test and fix.
 
OK, there’s my two cents worth. CU in Branson.
 
72-
 
Nick, WA5BDU
 
 
 
From: David Martin davemrtn@... [4sqrp]
Sent: Wednesday, February 22, 2017 5:21 AM
To: 4sqrp@... ; Doug Hendricks ; Walter - K5EST
Subject: Re: [4sqrp] Re: OzarkCon Alert: Special Prize Package after the 60 Minute Circuit Board presentation
 
 

Doug,

    Nick is giving a presentation specifically on this subject at the coming OzarkCon.  Perhaps you would want to attend to get his first hand information ??

David Martin - NA1MH - Mountain Home, Ar. -----------------------------------------
On 2/21/2017 23:10, Doug Hendricks ki6ds1@... [4sqrp] wrote:
 
Gee, I didn't spend nearly that much for my supplies to build boards.  I think Nick uses the Chuck Adams, K7QO method that is on his web site.  I am a huge fan of that method, and have made over 100 boards without a single failure.  After trying for over 20 years and failing every single time, I was amazed at how easy it is once you use Chuck's method.  Here is what I spent:
 
Laminator $25 Ebay
Samsung 2020 Laser Printer, $49 Fry's
Pyrex dish, $5 dollar store
Digital Thermometer, $8 Harbor Freight
Plastic clamp $1 for 6, Harbor Freight
3% Hydrogen Peroxide, $1.89 for 32 ounces, Lucky's Grocery Store
Muriatic Acid, $5 gallon, Home Depot
Steel Wool, $2 Home Depot
3m scouring pad, $2 Orchard Supply
pcb, ebay $7
 
Adds up to $105.89.
 
Guess you guys must be including the computer, lol.  I recommend that you attend Nick's session, you will learn a lot.  The best thing is that you will then be able to build any circuit you want to.  It is like unlocking the world.  72, Doug
 
On Tue, Feb 21, 2017 at 4:37 PM, Walter - K5EST walter.k5est@... [4sqrp] <4sqrp@...> wrote:
 
Amazing prize drawing! Thanks, Ed.
73....Walter - K5EST
 
 



Re: Some advice please - Relay coil protection diode

Ronald Morrison
 

Let me try to shed a little light on this topic.  W/o a protection diode across the DC relay coil, when the circuit is opened, the coil becomes an energy source due to the energy stored in the electromagnetic field of the coil inductance.  That field will begin to collapse in order to maintain the current that was flowing when the circuit became open.. The physics is such that the field will reverse polarity and the voltage generated will spike to a very high level as the circuit tries to maintain the current .  You've probably seen an arc occur across a switch or relay contact when switching off an inductive load.  That arc is due to the stored energy in the inductance.

A diode across the coil is reverse biased in normal operation and no current flows through it.  When the circuit is opened, the field polarity switches and the field current has a path through the now forward biased diode.  There will be no voltage spike generated as the current will flow through the diode and back into the coil.  The diode's reverse voltage rating only has to be greater than the normal supply voltage.  The current that flows in the diode is limited by the coil resistance, so that is the determining factor for the diode's current rating.  The field energy is dissipated as heat in the resistance of the diode and relay coil.  The greater the inductance of the coil, the longer the current will flow for a given resistance.

Note that the current does NOT flow back into the power source.  It can't because the power source is in series with the open switch.

Signal diodes work well for small DC relays, as has been stated.  A 1N4001 diode works well with larger DC relays due to its one amp continuous rating.

AC relays aren't as easy to protect.  The advent of solid state relays with "zero current crossing" detectors enables them to switch when the current is zero and thus alleviates the problem. 

Hope this helps!

Ron, K5DUZ


Re: OzarkCon Alert: Special Prize Package after the 60 Minute Circuit Board presentation

Nick-WA5BDU
 

I’m really happy to be part of the toner transfer presentation, but N5IB is actually the lead man on the effort.
 
I’ve gotten into this discussion late and have seen some good pro and con opinions.
 
The cost is a big one. It takes a lot to pry me loose from a dollar, so I wanted to be sure I was getting into something that would work for me. I checked out Chuck’s videos and read comments on QRP-Tech, plus bugged Jim N5IB with questions.
 
The biggies are a Laser printer and a laminator.  I was surprised that the printer was less than $60. And it has other value in my shack (as a printer, of all things). It prints faster and cheaper than the color inkjet. The laminator I only use for PCB work. Can it cook a grilled cheese sandwich?  I don’t know. I bit the bullet and bought the nice Apache laminator. I may have saved some money with another brand but I decided to go with the one with the best reviews.
 
I had kind of reached a limit on PCB complexity using my typical Manhattan and Ugly methods. Yes, you can do complex stuff in Manhattan like the 2N2/40 if you have the skills of K8IQY or NA5N.  My boards just grow and get unwieldy and collapse under their own weight and chaotic layout. Doing a layout with ExpressPCB enforces a kind of structure on me. I must complete the layout before I can start building. I’d have never gotten the complex boards for my phasing receiver done without the transition to doing my own boards this way.
 
As far as the “fab houses” go – it’s hard to imagine that I won’t eventually give them a go. Right now I don’t have anything that will output Gerber and learning the rules of Gerber will be a new task for me. Possibly a couple of downsides ... If there’s a limit of ten or even three boards, do I need that many?  If I make a major mistake, I’ve made it triplicate (or tenfold). Corrections are easier here in my home mad scientist’s laboratory.
 
I think if I were using through-hole parts I’d probably want to use a fab house – who wants to drill all those holes?  But I’ve become completely sold on SMT and/or converting conventional parts to SMT in the manner of Pittsburgh or Chuck’s “Muppet” method.  (Or Manhattan, for that matter). SMT is easier to probe and test, easier to remove and replace parts, easier to make minor corrections to the circuit.  Most of the stuff I do is being done “for the first time” (at least by me), so I need to be able to test and fix.
 
OK, there’s my two cents worth. CU in Branson.
 
72-
 
Nick, WA5BDU
 
 
 

From: David Martin davemrtn@... [4sqrp]
Sent: Wednesday, February 22, 2017 5:21 AM
To: 4sqrp@... ; Doug Hendricks ; Walter - K5EST
Subject: Re: [4sqrp] Re: OzarkCon Alert: Special Prize Package after the 60 Minute Circuit Board presentation
 
 

Doug,

    Nick is giving a presentation specifically on this subject at the coming OzarkCon.  Perhaps you would want to attend to get his first hand information ??

David Martin - NA1MH - Mountain Home, Ar. -----------------------------------------
On 2/21/2017 23:10, Doug Hendricks ki6ds1@... [4sqrp] wrote:
 
Gee, I didn't spend nearly that much for my supplies to build boards.  I think Nick uses the Chuck Adams, K7QO method that is on his web site.  I am a huge fan of that method, and have made over 100 boards without a single failure.  After trying for over 20 years and failing every single time, I was amazed at how easy it is once you use Chuck's method.  Here is what I spent:
 
Laminator $25 Ebay
Samsung 2020 Laser Printer, $49 Fry's
Pyrex dish, $5 dollar store
Digital Thermometer, $8 Harbor Freight
Plastic clamp $1 for 6, Harbor Freight
3% Hydrogen Peroxide, $1.89 for 32 ounces, Lucky's Grocery Store
Muriatic Acid, $5 gallon, Home Depot
Steel Wool, $2 Home Depot
3m scouring pad, $2 Orchard Supply
pcb, ebay $7
 
Adds up to $105.89.
 
Guess you guys must be including the computer, lol.  I recommend that you attend Nick's session, you will learn a lot.  The best thing is that you will then be able to build any circuit you want to.  It is like unlocking the world.  72, Doug
 
On Tue, Feb 21, 2017 at 4:37 PM, Walter - K5EST walter.k5est@... [4sqrp] <4sqrp@...> wrote:
 
Amazing prize drawing! Thanks, Ed.
73....Walter - K5EST
 
 


Re: Some advice please - with numbers!

KK0S
 

Hey guys! Let's look at the specs for these diodes -
The 1N400x series of diodes is rated at 1 Amp max. current.
The maximum reverse voltage for the 1N4001 is 50 Volts.
1N4002 - 100 V
1N4003 - 200 V
1N4004 - 400 V
1N4005 - 600 V
1N4006 - 800 V
1N4007 - 1000 V

There is no difference now between the 1N4148 and the 1N914 diode. Manufacturers now just make the 1N4148 and when somebody orders some 1N914 diodes, they just change the part number marked on the diode and raise the price. The 1N914 is obsolete. The only difference was the reverse current leakage rating - which won't generally affect hobbiests.

The 1N4148 "generally" can handle 0.2 to 0.3 Amp - depending on who made the diode. Specs are all over the place.
The maximum reverse voltage rating for a 1N4148 "generally" runs from 75 to 100 volts.
The 1N4148 diode is a "signal" diode and can respond up into the MHZ region.
The 1N400x series of diodes is a "power" diode", with higher internal capacitance, and slower response time. But for the average relay, etc. it will be just fine - (and cheap, too.)

If you are using the 1N4148 diodes as a spike snubber across a relay, please be sure it is a SMALL (physical coil size) relay, such as a plug-in molded DIP relay.
If you are using something with a large coil, such as a 12-volt automotive relay, or starter relay - the spike coming back at the diode will likely have sufficient energy to destroy it.
I would suggest for the larger relays, that you use a 1N4004 or better.

JMHO
Thanks.
Bruce - KK0S

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