Date   

Re: September Ozark QRP Banner is online

Johnny AC0BQ
 

Nice job, Jeremy!
As Dale said, great read !
Thanks 
72
Johnny AC0BQ

On Monday, September 1, 2014, 'Jeremy Utley' jerutley@... [4sqrp] <4sqrp@...> wrote:
 

Hey all!

 

Since I expect the next couple of weeks to be pretty busy here, between work and preparing for Brutus, I decided to get the September issue of the Banner up nice and early this month!  It’s up and online now!

 

http://www.4sqrp.com/TheBanner.php

 

From the index:

 

Brutus Bash

Ozarkcon 2015

WD9F’s Antenna Journey

Bugg’in CW

KB6NU’s column – Remote Ops

4x4 Sprint

From the Editor

 

Hope everyone enjoys!  Thanks to everyone who sent in articles!

 

73

Jeremy, NQ0M

In Beautiful Downtown Iola, KS

 



--
QRP....."more smiles per watt"
72
JOHNNY AC0BQ  ..


Re: RCA connectors and audio cable use in QRP devices

James Compton
 

Great comments, opinions and suggestions!  Keep the information coming!  I was more concerned with antenna use, but points regarding the use of RCA plugs for power are certainly valid and, I must admit, not something I had previously considered.
Jim, K4JDC

-----Original Message-----
From: "Don Wilhelm w3fpr@... [4sqrp]" <4sqrp@...>
Sent: Sep 2, 2014 8:10 PM
To: 4sqrp@..., wb8yyy@...
Subject: Re: [4sqrp] Re: RCA connectors and audio cable use in QRP devices

 

I have a *big* safety concern about the practice of using RCA jacks for DC power *inputs*.
If the plug is disconnected and allowed to lounge about on the workbench, that plug is subject to be shorted by wire leads and other objects on the workbench - definitely a safety consideration if the power cord is connected to a high current source like a battery or high current power supply.
If you use those RCA connectors for DC power input, fuse the power cord near the power source, or better yet, install a short permanent connector conversion cable between the RCA jack and the DC connector of your choice (I prefer APP connectors) so that the connect/disconnect power cable does not create a danger of molten metal and personal injury when not connected.

73,
Don W3FPR
 

On 9/2/2014 7:49 PM, wb8yyy@... [4sqrp] wrote:
 
I am even more concerned using a connector type for multiple purposes.  If one used something like an RCA for every kind of connection, plugging dc power into some of these could cause damage.  




Re: RCA connectors and audio cable use in QRP devices

Don Wilhelm <w3fpr@...>
 

I have a *big* safety concern about the practice of using RCA jacks for DC power *inputs*.
If the plug is disconnected and allowed to lounge about on the workbench, that plug is subject to be shorted by wire leads and other objects on the workbench - definitely a safety consideration if the power cord is connected to a high current source like a battery or high current power supply.
If you use those RCA connectors for DC power input, fuse the power cord near the power source, or better yet, install a short permanent connector conversion cable between the RCA jack and the DC connector of your choice (I prefer APP connectors) so that the connect/disconnect power cable does not create a danger of molten metal and personal injury when not connected.

73,
Don W3FPR
 

On 9/2/2014 7:49 PM, wb8yyy@... [4sqrp] wrote:
 
I am even more concerned using a connector type for multiple purposes.  If one used something like an RCA for every kind of connection, plugging dc power into some of these could cause damage.  




Re: RCA connectors and audio cable use in QRP devices

WVØH <s9plus@...>
 

The physical length any connector is so short compared to any HF wavelength that you will not see any impedance discontinuities due to that connector. And if you were to "run the numbers" anyway for an RCA jack, Zo=138(LOG(b/a)), you will see that the characteristic impedance is close to fiddy oams.

Myron WVØH
Printed on Recycled Data

On Sep 2, 2014, at 5:41 PM, "'Todd F. Carney / K7TFC' k7tfc@... [4sqrp]" <4sqrp@...> wrote:

 

I've seen RCA plugs used on the ends of RG-58 or RG-8X coax before. That at least means 50 ohm cable, even if the RCA plug/socket does have a blip of a different impedance. I think audio cable is generally made for 600 ohms. It's also not as well shielded, I think. 

As W5COV suggests, it might not matter much. It's at least worth a try. If the cables are short enough, you might never notice the difference. 

Disclaimer: I'm not an expert.

73,

Todd
------------------------------------------------------------------------------------
K7TFC / Medford, Oregon, USA / CN82ni / UTC-
7
 (P
​D
T)
------------------------------------------------------------------------------------



On Tue, Sep 2, 2014 at 11:29 PM, 'Charlie , W5COV' cvest@... [4sqrp] <4sqrp@...> wrote:
 

I am not going to get too involved in this discussion because there is a HUGE amount of latitude, theories, thoughts, myths, and positions.

However RCA type plugs and cables have not been limited to just the QRP arena. Heathkit, Drake, even Collins, and others used them in QRO and interface applications.

Charlie, W5COV


On 9/2/2014 6:12 PM, jdcompton@... [4sqrp] wrote:
 

Many of the QRP kits and home brew transmitters (and receivers?) use RCA jacks and  plugs for various connections, including power, keys, and antennas, I suppose because they are compact , cheap and usually can be found in the junk drawer.. 


 When connecting an antenna to an RCA jack in a QRP  transmitter,  is it necessary to use an adapter to immediately transition to coax cable or can an audio cable be used for very short connections, for instance to connect to a power meter, dummy load, antenna tuner, etc.?


Audio cables are shielded, but I don't know if they are satisfactory for short patch cables for RF in the HF spectrum for ham components. And I have no idea what the impedance of these cables might be. Since so many designers, especially home brewers, use them, what are the pros and cons?


Jim Compton, K4JDC





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Re: RCA connectors and audio cable use in QRP devices

Curt
 

A lot of things depend upon details.  A transmission line is warranted when the electrical length is such that the signal phase in degrees has changed a lot.  Notice I am not being very numeric but certainly a path where the RF changes just a few degrees can be serviced by a piece of wire.  However if there are multiple signals in the close vicinity then there is the matter of shielding that may benefit from being a short piece of coax.  

I am even more concerned using a connector type for multiple purposes.  If one used something like an RCA for every kind of connection, plugging dc power into some of these could cause damage.  

I had not thought of this connection but naming this style connector after a former very large electronics conglomerate sounds uncanny when they were much more involved in devices, circuits and complete products.  Oh yes i once worked for RCA.  

73 Curt


Re: RCA connectors and audio cable use in QRP devices

Todd K7TFC
 

I've seen RCA plugs used on the ends of RG-58 or RG-8X coax before. That at least means 50 ohm cable, even if the RCA plug/socket does have a blip of a different impedance. I think audio cable is generally made for 600 ohms. It's also not as well shielded, I think. 

As W5COV suggests, it might not matter much. It's at least worth a try. If the cables are short enough, you might never notice the difference. 

Disclaimer: I'm not an expert.

73,

Todd
------------------------------------------------------------------------------------
K7TFC / Medford, Oregon, USA / CN82ni / UTC-
7
 (P
​D
T)
------------------------------------------------------------------------------------



On Tue, Sep 2, 2014 at 11:29 PM, 'Charlie , W5COV' cvest@... [4sqrp] <4sqrp@...> wrote:
 

I am not going to get too involved in this discussion because there is a HUGE amount of latitude, theories, thoughts, myths, and positions.

However RCA type plugs and cables have not been limited to just the QRP arena. Heathkit, Drake, even Collins, and others used them in QRO and interface applications.

Charlie, W5COV


On 9/2/2014 6:12 PM, jdcompton@... [4sqrp] wrote:
 

Many of the QRP kits and home brew transmitters (and receivers?) use RCA jacks and  plugs for various connections, including power, keys, and antennas, I suppose because they are compact , cheap and usually can be found in the junk drawer.. 


 When connecting an antenna to an RCA jack in a QRP  transmitter,  is it necessary to use an adapter to immediately transition to coax cable or can an audio cable be used for very short connections, for instance to connect to a power meter, dummy load, antenna tuner, etc.?


Audio cables are shielded, but I don't know if they are satisfactory for short patch cables for RF in the HF spectrum for ham components. And I have no idea what the impedance of these cables might be. Since so many designers, especially home brewers, use them, what are the pros and cons?


Jim Compton, K4JDC





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Re: RCA connectors and audio cable use in QRP devices

James Compton
 

Don,

Interesting information.  One of the things that prompted my question was the fact that I couldn't find any normal coax cables with RCA ends.  Made me wonder about all those RCA jacks I'm seeing for antenna connections in several kits I've seen.

Thanks for the reply.

Jim C., K4JDC

-----Original Message-----
From: "Don Wilhelm w3fpr@... [4sqrp]" <4sqrp@...>
Sent: Sep 2, 2014 7:35 PM
To: 4sqrp@..., jdcompton@...
Subject: Re: [4sqrp] RCA connectors and audio cable use in QRP devices

 

Jim,

I would hesitate to use audio cables in RF coax applications - period.
The only exception would be for temporary test use.

As you mention, both the shielding and the impedance can be suspect.

Both Collins and Heathkit used RCA jacks for RF output at a power level of about 100 watts output, so there is nothing wrong with the jacks, but the plugs used at that time were of the type where the shield was soldered directly to the outer shell of the plug - they looked quite ugly, but provided a good solid path for the shield.
I think the modern and easily available RCA plugs with solder lugs will not provide that tight bonding of the shield and can result in a significant impedance bump.

I think it is better to use BNC connectors for the RF antenna connection - an RCA to BNC adapter can be used if it is impractical to substitute a BNC jack for the RCA jack.

The problem is in the plug used - the RCA jack is usually just fine.

73,
Don W3FPR

On 9/2/2014 7:12 PM, jdcompton@... [4sqrp] wrote:
 

Many of the QRP kits and home brew transmitters (and receivers?) use RCA jacks and  plugs for various connections, including power, keys, and antennas, I suppose because they are compact , cheap and usually can be found in the junk drawer.. 


 When connecting an antenna to an RCA jack in a QRP  transmitter,  is it necessary to use an adapter to immediately transition to coax cable or can an audio cable be used for very short connections, for instance to connect to a power meter, dummy load, antenna tuner, etc.?


Audio cables are shielded, but I don't know if they are satisfactory for short patch cables for RF in the HF spectrum for ham components. And I have no idea what the impedance of these cables might be. Since so many designers, especially home brewers, use them, what are the pros and cons?




Re: RCA connectors and audio cable use in QRP devices

Bill Cromwell
 

They can also be used with 50 ohm coaxial cable/

73,

Bill KU8H

On 09/02/2014 07:29 PM, 'Charlie , W5COV' @w5cov [4sqrp] wrote:

I am not going to get too involved in this discussion because there is a HUGE amount of latitude, theories, thoughts, myths, and positions.

However RCA type plugs and cables have not been limited to just the QRP arena. Heathkit, Drake, even Collins, and others used them in QRO and interface applications.

Charlie, W5COV


Re: RCA connectors and audio cable use in QRP devices

Don Wilhelm <w3fpr@...>
 

Jim,

I would hesitate to use audio cables in RF coax applications - period.
The only exception would be for temporary test use.

As you mention, both the shielding and the impedance can be suspect.

Both Collins and Heathkit used RCA jacks for RF output at a power level of about 100 watts output, so there is nothing wrong with the jacks, but the plugs used at that time were of the type where the shield was soldered directly to the outer shell of the plug - they looked quite ugly, but provided a good solid path for the shield.
I think the modern and easily available RCA plugs with solder lugs will not provide that tight bonding of the shield and can result in a significant impedance bump.

I think it is better to use BNC connectors for the RF antenna connection - an RCA to BNC adapter can be used if it is impractical to substitute a BNC jack for the RCA jack.

The problem is in the plug used - the RCA jack is usually just fine.

73,
Don W3FPR

On 9/2/2014 7:12 PM, jdcompton@... [4sqrp] wrote:
 

Many of the QRP kits and home brew transmitters (and receivers?) use RCA jacks and  plugs for various connections, including power, keys, and antennas, I suppose because they are compact , cheap and usually can be found in the junk drawer.. 


 When connecting an antenna to an RCA jack in a QRP  transmitter,  is it necessary to use an adapter to immediately transition to coax cable or can an audio cable be used for very short connections, for instance to connect to a power meter, dummy load, antenna tuner, etc.?


Audio cables are shielded, but I don't know if they are satisfactory for short patch cables for RF in the HF spectrum for ham components. And I have no idea what the impedance of these cables might be. Since so many designers, especially home brewers, use them, what are the pros and cons?




Re: RCA connectors and audio cable use in QRP devices

Charlie Vest
 

I am not going to get too involved in this discussion because there is a HUGE amount of latitude, theories, thoughts, myths, and positions.

However RCA type plugs and cables have not been limited to just the QRP arena. Heathkit, Drake, even Collins, and others used them in QRO and interface applications.

Charlie, W5COV


On 9/2/2014 6:12 PM, jdcompton@... [4sqrp] wrote:
 

Many of the QRP kits and home brew transmitters (and receivers?) use RCA jacks and  plugs for various connections, including power, keys, and antennas, I suppose because they are compact , cheap and usually can be found in the junk drawer.. 


 When connecting an antenna to an RCA jack in a QRP  transmitter,  is it necessary to use an adapter to immediately transition to coax cable or can an audio cable be used for very short connections, for instance to connect to a power meter, dummy load, antenna tuner, etc.?


Audio cables are shielded, but I don't know if they are satisfactory for short patch cables for RF in the HF spectrum for ham components. And I have no idea what the impedance of these cables might be. Since so many designers, especially home brewers, use them, what are the pros and cons?


Jim Compton, K4JDC





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RCA connectors and audio cable use in QRP devices

James Compton
 

Many of the QRP kits and home brew transmitters (and receivers?) use RCA jacks and  plugs for various connections, including power, keys, and antennas, I suppose because they are compact , cheap and usually can be found in the junk drawer.. 


 When connecting an antenna to an RCA jack in a QRP  transmitter,  is it necessary to use an adapter to immediately transition to coax cable or can an audio cable be used for very short connections, for instance to connect to a power meter, dummy load, antenna tuner, etc.?


Audio cables are shielded, but I don't know if they are satisfactory for short patch cables for RF in the HF spectrum for ham components. And I have no idea what the impedance of these cables might be. Since so many designers, especially home brewers, use them, what are the pros and cons?


Jim Compton, K4JDC


Re: September Ozark QRP Banner is online

Walter - K5EST
 

Congrats and Great job, Jeremy.  Thank you for taking the Banner to new heights!

72/73,

............Walter . K5EST............
.....Amateur Radio Station.....
Elecraft KX3 - Yaesu FT-817
................4sqrp.com...............

On Sep 2, 2014 10:25 AM, "'Jeremy Utley' jerutley@... [4sqrp]" <4sqrp@...> wrote:
 

Hey all!

 

Since I expect the next couple of weeks to be pretty busy here, between work and preparing for Brutus, I decided to get the September issue of the Banner up nice and early this month!  It’s up and online now!

 

http://www.4sqrp.com/TheBanner.php

 

From the index:

 

Brutus Bash

Ozarkcon 2015

WD9F’s Antenna Journey

Bugg’in CW

KB6NU’s column – Remote Ops

4x4 Sprint

From the Editor

 

Hope everyone enjoys!  Thanks to everyone who sent in articles!

 

73

Jeremy, NQ0M

In Beautiful Downtown Iola, KS

 


Re: September Ozark QRP Banner is online

Phil Anderson
 

The newsletter is looking good Jeremy..........

unc Phil, W0XI

'Jeremy Utley' jerutley@... [4sqrp] wrote:


Hey all!

Since I expect the next couple of weeks to be pretty busy here,
between work and preparing for Brutus, I decided to get the September
issue of the Banner up nice and early this month! It’s up and online now!

http://www.4sqrp.com/TheBanner.php

>From the index:

Brutus Bash

Ozarkcon 2015

WD9F’s Antenna Journey

Bugg’in CW

KB6NU’s column – Remote Ops

4x4 Sprint

>From the Editor

Hope everyone enjoys! Thanks to everyone who sent in articles!

73

Jeremy, NQ0M

In Beautiful Downtown Iola, KS




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Re: September Ozark QRP Banner is online

Rich Fowler <k8meg@...>
 

GM Jeremy, Nicely done Banner! Thanks!
72,
Rich K8MEG


Re: September Ozark QRP Banner is online

Paul Smith
 

Great news letter Jeremy, You are off to a good start.
Tnx and cul de Paul N0NBD




On Sep 1, 2014, at 11:02 PM, 'Jeremy Utley' jerutley@... [4sqrp] <4sqrp@...> wrote:


Hey all!

 

Since I expect the next couple of weeks to be pretty busy here, between work and preparing for Brutus, I decided to get the September issue of the Banner up nice and early this month!  It’s up and online now!

 

http://www.4sqrp.com/TheBanner.php

 

From the index:

 

Brutus Bash

Ozarkcon 2015

WD9F’s Antenna Journey

Bugg’in CW

KB6NU’s column – Remote Ops

4x4 Sprint

From the Editor

 

Hope everyone enjoys!  Thanks to everyone who sent in articles!

 

73

Jeremy, NQ0M

In Beautiful Downtown Iola, KS

 




Re: September Ozark QRP Banner is online

Dale Putnam
 

Hi Jeremy,
  Great issue.. good read, cover to cover.
Thank you for your very productive labor of love!!

Have a great day,
 
 
--... ...-- Dale - WC7S in Wy
 
 



To: 4sqrp@...
From: 4sqrp@...
Date: Mon, 1 Sep 2014 23:02:54 -0500
Subject: [4sqrp] September Ozark QRP Banner is online

 

Hey all!

 

Since I expect the next couple of weeks to be pretty busy here, between work and preparing for Brutus, I decided to get the September issue of the Banner up nice and early this month!  It’s up and online now!

 

http://www.4sqrp.com/TheBanner.php

 

From the index:

 

Brutus Bash

Ozarkcon 2015

WD9F’s Antenna Journey

Bugg’in CW

KB6NU’s column – Remote Ops

4x4 Sprint

From the Editor

 

Hope everyone enjoys!  Thanks to everyone who sent in articles!

 

73

Jeremy, NQ0M

In Beautiful Downtown Iola, KS

 



September Ozark QRP Banner is online

Jeremy Utley
 

Hey all!

 

Since I expect the next couple of weeks to be pretty busy here, between work and preparing for Brutus, I decided to get the September issue of the Banner up nice and early this month!  It’s up and online now!

 

http://www.4sqrp.com/TheBanner.php

 

From the index:

 

Brutus Bash

Ozarkcon 2015

WD9F’s Antenna Journey

Bugg’in CW

KB6NU’s column – Remote Ops

4x4 Sprint

From the Editor

 

Hope everyone enjoys!  Thanks to everyone who sent in articles!

 

73

Jeremy, NQ0M

In Beautiful Downtown Iola, KS

 


New Rig Power

WA0ITP
 

GA AJ,

"my New Used rigs coming will go down to 10 watts, can i still check in with that ?"   Yes, of course, glad to have you check in with it.
-- 
72 WAØITP
I love this radio stuff.
www.wa0itp.com
wa0itp@...
www.4sqrp.com



On 9/1/2014 11:09 AM, A email4utoo@... [4sqrp] wrote:
Thanks Phil, i did not know you cared so much, hihi, the Heart Icon , just a nudge !  changing antennas and adding Coax , changing Rigs, will be off Net for awhile , my New Used rigs coming will go down to 10 watts, can i still check in with that ? i am not trying to hide anything no need for it at my age ! lol hihi.  will be building 4States kits this winter for proper QRP power and weight ! hihi .  thanks again Phil for your efforts to help us improve our Fists !  73s, "AJ" W5HEH


------------------------------------
Posted by: A 
------------------------------------

4SQRP Website: http://4sqrp.com
OzarkCon is coming April 4-5, 2014 in Branson, MO
View Details at http://www.ozarkcon.com/index.php
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-- 
72 WAØITP
I love this radio stuff.
www.wa0itp.com
wa0itp@...
www.4sqrp.com


Re: The Code Blog...........ok had mistyped the link OPS

W5HEH AJ
 

Thanks Phil, i did not know you cared so much, hihi, the Heart Icon , just a nudge ! changing antennas and adding Coax , changing Rigs, will be off Net for awhile , my New Used rigs coming will go down to 10 watts, can i still check in with that ? i am not trying to hide anything no need for it at my age ! lol hihi. will be building 4States kits this winter for proper QRP power and weight ! hihi . thanks again Phil for your efforts to help us improve our Fists ! 73s, "AJ" W5HEH


Re: Big Brutus in 2 weeks

John Lonigro
 

The SSS is scheduled to fall on the 14th of September, from 7:00-9:00 pm. I just realized many folks at the Big Brutus Bash will be packed up and heading home by then. If enough people think it's a good idea, for this one time only, we could make it the Second SATURDAY Sprint - same time, but one day earlier. That might produce much more activity than if I kept it Sunday night. One thing to consider: Some of the participants in the SSS will be co-located, making it difficult to have QSOs without blowing out each other's receivers. It might degenerate into a big dummy load party!

Another option would be to make it a different weekend (Sep 21st?), to avoid a conflict altogether.

What's everyone think? It doesn't really matter to me. Please send me your feedback this week, to give me time to send out updated notices. I'd hate for people to not get the word and wonder why nobody is on the air the night of the 14th.

Note: As of now, the SSS is still scheduled for SUNDAY, September 14th.

Send your feedback by replying to this email. Don't use the special sprint email address.

Thanks and 72,

John AA0VE

On 09/01/2014 09:53 AM, WA0ITP wa0itp@... [4sqrp] wrote:

GM All,

As this is Sept 1, it seems appropriate to send another announcement. The Big Brutus outing is coming up fast, only two weeks to go. It's Sept 13 and 14, that's the weekend after next!

Betty in the office says there are 8 reservations, that's a good start, but we need more. There are almost unlimited tents sites available and many camper sites available also (some with electric and water, and some without). Pse make your reservations now by calling 620-827-6177.

Here's some info to help with your planning.

Arnie, KA0NCR's Big Brutus Camping checklist.
http://www.4sqrp.com/BigBrutusCheckList.html

Big Brutus Web site
http://www.bigbrutus.org/visitor_center.html

Past outings.
http://www.wa0itp.com/portableops.html
Sri I dont have anything for last year. If anyone has some pictures pse send them to me and I'll make up a web page for 2013.



Have a great labor day holiday.

--
72 WAØITP
I love this radio stuff.
www.wa0itp.com
wa0itp@...
www.4sqrp.com