Date   

Re: More Murania Mods

Jim WB2LHP in MI <jmarco1955@...>
 

So, of course, I made a mistake...Fat fingers and old eyes...I mistyped the total number of turns for L1...It is 61 turns, not 51 turns...Sorry for the error...Jim WB2LHP


[4SQRP] Murania on 5 MHz?

Jim WB2LHP in MI <jmarco1955@...>
 



---------- Forwarded message ---------
From: Jim Marco <jmarco1955@...>
Date: Wed, Oct 24, 2018 at 8:46 PM
Subject: Re: [4SQRP] Murania on 5 MHz?
To: <main@4sqrp.groups.io>
Cc: <muraniakit@...>


So, of course, I made a mistake...Fat fingers and old eyes...I mistyped the total number of turns for L1...It is 61 turns, not 51 turns...My tap is 14 turn from the top of the coil if you want to experiment above the AM broadcast band, which I did not...Sorry for the error...

No pictures but you get the idea...73 Jim WB2LHP

On Wed, Oct 24, 2018 at 5:20 PM Dwayne R via Groups.Io <masterdr=yahoo.com@groups.io> wrote:
 Hello Jim. . .

  I realize I have not built or seen the schematic of this radio (Yet). Because I just got through ordering 2 of them.
But. . .

For a tuned circuit, the more inductance you add, the lower the frequency. . .

Thus, you adding of 15 turns on top of a existing coil that is made for 1.6 mhz should LOWER the frequency,
instead of raising the frequency.  I would think that you would want to take the existing coil, unwrap about
X number of turns, and tap on to that point, then rewrap the coil back up. .  .
Placing a switch that excites the tapped point, and when turned off, uses the whole coil.

Please forgive me if I am wrong... Especially since I have not built or have the schematic in front of me!

Dwayne (Ka0aam)



--------------------------------------------
On Tue, 10/23/18, Jim WB2LHP in MI <jmarco1955@...> wrote:

 Subject: Re: [4SQRP] Murania on 5 MHz?
 To: main@4sqrp.groups.io
 Date: Tuesday, October 23, 2018, 2:52 PM

 Hi
 Dave...The short answer is "maybe"...
  I've been thinking about this
 myself...According to the data sheet, the TA7642 tops out at
 about 3MHz but I have read where people have used them at
 frequencies up to 10MHz...Here's a possible scenario you
 can try...
  If you are
 using the original 37-turn coil, you can add another 14
 turns to the coil and use the old end as a center tap...This
 creates a second winding of around 15uH...Depending on which
 coil you short out, you will get two tuning ranges...One for
 the AM broadcast band, the other for roughly 1800KHz to
 6MHz...I haven't tried this myself but it should
 work...
  Jim
 WB2LHP
 On Tue, Oct
 23, 2018 at 2:43 PM Dave Redfearn <n4elm@...>
 wrote:
 Would it
 be practical to mod the Murania to tune between 5 & 6
 MHz?
 73 - Dave, N4ELM











Re: Stations heard

Everett Catlin
 



On Wednesday, October 24, 2018, 9:39:40 PM UTC, Everett Catlin <everettcatlin@...> wrote:




On Wednesday, October 24, 2018, 9:27:45 PM UTC, Everett Catlin <everettcatlin@...> wrote:


Hi All,

My Pup got me up at 0500 local today. I turned on my un- modified Murania and heard WBAP, WBBM , WGN, WSM (local), WHO, WLS, WSB,
WTAM (local), WOAI, WAKM (local) and my old favorite WWL. This is not bad for a one transistor and one IC.I had much fun this morning. I am located in Columbia, Tn. Dave Cripe did a great job in the design of this radio.

73
Everett Catlin N5MZX


Stations heard

Everett Catlin
 

Hi All,

My Pup got me up at 0500 local today. I turned on my un- modified Murania and heard WBAP, WBBM , WGN, WSM (local), WHO, WLS, WSB,
WTAM (local), WOAI, WAKM (local) and my old favorite WWL. This is not bad for a one transistor and one IC.I had much fun this morning. I am located in Columbia, Tn. Dave Cripe did a great job in the design of this radio.

73
Everett Catlin N5MZX


Simple Murania mod offers improved performance

Jim WB2LHP in MI <jmarco1955@...>
 

Here is a simple mod that will produce better performance from the very fine Murania radio...It is completely reversible and requires no hacking of the radio...

I live 5 miles from a 50kW AM station which tends to overload the detector in the TA7642 IC...Here's the fix...

FLOAT the wiper lug of R3
Place a jumper between the PADS for the R3 wiper and the high side of R3
Lift the leg of R1 that intersects with R2 and R3
Connect a jumper between the floated leg of R1 and the wiper of R3

Done...

This allows R3 to control the gain of the detector stage in the TA7642...The audio amp runs wide open...Adjust R3 for the best sounding audio...R3 now acts similar to a regenerative control where there is both volume and gain reaction...

This mod comes from my own experimenting and information gleaned off the Internet...Give it a try...I think you'll be pleased with the results...

73 Jim WB2LHP in MI


More Murania Mods

Jim WB2LHP in MI <jmarco1955@...>
 

Here are some additional mods for the Murania radio...These are easy to do and are completely reversible without hacking the radio...

Reduced audio distortion...

In addition to my previous post regarding the change in use of R3, change R2 from 1K to 2.7K...

Frequency coverage and dial mapping...

Increase L1 from 37 turns to 51 turns...Remove C8...This centers the frequency coverage and makes the dial tracking spot on...

Overall Performance...

The audio is now crystal clear...Tuning is sharper...The change to L1 may not be necessary or important to you...It is offered as an option to you...The change to R2 is critical, in my opinion...Your mileage may vary and these mods are made at your own peril, but are not hazardous...

The Murania radio is an outstanding kit and highly recommended...Please email me with any questions...73 Jim WB2LHP in MI


Re: No hiss from speaker

cornhusker
 

I can bring mine!
73 de K0NEB 



On Fri, Jul 13, 2018 at 12:55 PM, WA0ITP
<wa0itp@...> wrote:
Sri abt the screenshot.  I have no idea how it got pasted in the email.  Another cyber mystery to me.
72 WAØITP
I love this radio stuff.
www.wa0itp.com
www.4sqrp.com
On 7/13/2018 12:27 PM, WA0ITP wrote:
GA Paul,

Good going Paul.  Can you receive WHO 1040, or WMT 600 ?  It will be good to have your rcvr as a demo unit for the upcoming Expo.
72 WAØITP
I love this radio stuff.
www.wa0itp.com
www.4sqrp.com
On 7/13/2018 10:21 AM, Paul Cartwright wrote:
Thanks for the reply Johnny.  I did go ahead and finish it last night. It worked perfectly even though I did not get the hiss like the manual said.  

Interestingly, I had put the continuity tester across the primary coil of the transformer and heard a hiss from the speaker. So, I knew that the transformer through the speaker was wired correctly.

Paul WA0PAC

On Fri, Jul 13, 2018 at 6:37 AM, Johnny Matlock <jomatlock@...> wrote:
Gm Paul
I built mine a few weeks ago
And that was my outcome as well.
Dave advised me to go ahead with the build.
I did all everything was fine.
I think we may need to update the manual.
72
Johnny AC0BQ 

On Thu, Jul 12, 2018 at 10:50 PM Paul Cartwright <paul@...> wrote:
I have finished the audio amplifier portion of the build. I am not able to hear any hiss from the speaker while following the test instructions. The power circuit tested at 1.7 volts. I have double checked the components and connections, including comparing my circuit with the photos on the website. Everything looks correct. Any ideas on how to troubleshoot this problem? 

Paul Cartwright
WA0PAC

--
Check out the 4SQRP website at 4sqrp.com




Re: No hiss from speaker

WA0ITP
 

FB will do and tnx agn

72 WAØITP
I love this radio stuff.
www.wa0itp.com
www.4sqrp.com
On 7/13/2018 4:05 PM, Paul Smith wrote:

Hello Terry,

I am intrested to find out what my Murania will pick up in ur neck of the woods. I have only messed abt with it in the daytime and between 12 es 14 it is blanked by the stations in Chanute and Iola each 10 miles away.  Let me know how it does. it might just be there tomorrow

de Paul N0NBD


Sent from Outlook




From: MuraniaKit@4SQRP.groups.io <MuraniaKit@4SQRP.groups.io> on behalf of WA0ITP <wa0itp@...>
Sent: Friday, July 13, 2018 5:27 PM
To: MuraniaKit@4SQRP.groups.io
Subject: Re: [MuraniaKit] No hiss from speaker
 
GA Paul,

Good going Paul.  Can you receive WHO 1040, or WMT 600 ?  It will be good to have your rcvr as a demo unit for the upcoming Expo.
72 WAØITP
I love this radio stuff.
www.wa0itp.com
www.4sqrp.com
On 7/13/2018 10:21 AM, Paul Cartwright wrote:
Thanks for the reply Johnny.  I did go ahead and finish it last night. It worked perfectly even though I did not get the hiss like the manual said.  

Interestingly, I had put the continuity tester across the primary coil of the transformer and heard a hiss from the speaker. So, I knew that the transformer through the speaker was wired correctly.

Paul WA0PAC

On Fri, Jul 13, 2018 at 6:37 AM, Johnny Matlock <jomatlock@...> wrote:
Gm Paul
I built mine a few weeks ago
And that was my outcome as well.
Dave advised me to go ahead with the build.
I did all everything was fine.
I think we may need to update the manual.
72
Johnny AC0BQ 

On Thu, Jul 12, 2018 at 10:50 PM Paul Cartwright <paul@...> wrote:
I have finished the audio amplifier portion of the build. I am not able to hear any hiss from the speaker while following the test instructions. The power circuit tested at 1.7 volts. I have double checked the components and connections, including comparing my circuit with the photos on the website. Everything looks correct. Any ideas on how to troubleshoot this problem? 

Paul Cartwright
WA0PAC

--
Check out the 4SQRP website at 4sqrp.com




Re: No hiss from speaker

Paul Smith
 

Hello Terry,

I am intrested to find out what my Murania will pick up in ur neck of the woods. I have only messed abt with it in the daytime and between 12 es 14 it is blanked by the stations in Chanute and Iola each 10 miles away.  Let me know how it does. it might just be there tomorrow

de Paul N0NBD


Sent from Outlook




From: MuraniaKit@4SQRP.groups.io <MuraniaKit@4SQRP.groups.io> on behalf of WA0ITP <wa0itp@...>
Sent: Friday, July 13, 2018 5:27 PM
To: MuraniaKit@4SQRP.groups.io
Subject: Re: [MuraniaKit] No hiss from speaker
 
GA Paul,

Good going Paul.  Can you receive WHO 1040, or WMT 600 ?  It will be good to have your rcvr as a demo unit for the upcoming Expo.
72 WAØITP
I love this radio stuff.
www.wa0itp.com
www.4sqrp.com
On 7/13/2018 10:21 AM, Paul Cartwright wrote:
Thanks for the reply Johnny.  I did go ahead and finish it last night. It worked perfectly even though I did not get the hiss like the manual said.  

Interestingly, I had put the continuity tester across the primary coil of the transformer and heard a hiss from the speaker. So, I knew that the transformer through the speaker was wired correctly.

Paul WA0PAC

On Fri, Jul 13, 2018 at 6:37 AM, Johnny Matlock <jomatlock@...> wrote:
Gm Paul
I built mine a few weeks ago
And that was my outcome as well.
Dave advised me to go ahead with the build.
I did all everything was fine.
I think we may need to update the manual.
72
Johnny AC0BQ 

On Thu, Jul 12, 2018 at 10:50 PM Paul Cartwright <paul@...> wrote:
I have finished the audio amplifier portion of the build. I am not able to hear any hiss from the speaker while following the test instructions. The power circuit tested at 1.7 volts. I have double checked the components and connections, including comparing my circuit with the photos on the website. Everything looks correct. Any ideas on how to troubleshoot this problem? 

Paul Cartwright
WA0PAC

--
Check out the 4SQRP website at 4sqrp.com



Re: No hiss from speaker

WA0ITP
 

Sri abt the screenshot.  I have no idea how it got pasted in the email.  Another cyber mystery to me.
72 WAØITP
I love this radio stuff.
www.wa0itp.com
www.4sqrp.com
On 7/13/2018 12:27 PM, WA0ITP wrote:

GA Paul,

Good going Paul.  Can you receive WHO 1040, or WMT 600 ?  It will be good to have your rcvr as a demo unit for the upcoming Expo.
72 WAØITP
I love this radio stuff.
www.wa0itp.com
www.4sqrp.com
On 7/13/2018 10:21 AM, Paul Cartwright wrote:
Thanks for the reply Johnny.  I did go ahead and finish it last night. It worked perfectly even though I did not get the hiss like the manual said.  

Interestingly, I had put the continuity tester across the primary coil of the transformer and heard a hiss from the speaker. So, I knew that the transformer through the speaker was wired correctly.

Paul WA0PAC

On Fri, Jul 13, 2018 at 6:37 AM, Johnny Matlock <jomatlock@...> wrote:
Gm Paul
I built mine a few weeks ago
And that was my outcome as well.
Dave advised me to go ahead with the build.
I did all everything was fine.
I think we may need to update the manual.
72
Johnny AC0BQ 

On Thu, Jul 12, 2018 at 10:50 PM Paul Cartwright <paul@...> wrote:
I have finished the audio amplifier portion of the build. I am not able to hear any hiss from the speaker while following the test instructions. The power circuit tested at 1.7 volts. I have double checked the components and connections, including comparing my circuit with the photos on the website. Everything looks correct. Any ideas on how to troubleshoot this problem? 

Paul Cartwright
WA0PAC

--
Check out the 4SQRP website at 4sqrp.com




Re: No hiss from speaker

WA0ITP
 

GA Paul,

Good going Paul.  Can you receive WHO 1040, or WMT 600 ?  It will be good to have your rcvr as a demo unit for the upcoming Expo.
72 WAØITP
I love this radio stuff.
www.wa0itp.com
www.4sqrp.com

On 7/13/2018 10:21 AM, Paul Cartwright wrote:
Thanks for the reply Johnny.  I did go ahead and finish it last night. It worked perfectly even though I did not get the hiss like the manual said.  

Interestingly, I had put the continuity tester across the primary coil of the transformer and heard a hiss from the speaker. So, I knew that the transformer through the speaker was wired correctly.

Paul WA0PAC

On Fri, Jul 13, 2018 at 6:37 AM, Johnny Matlock <jomatlock@...> wrote:
Gm Paul
I built mine a few weeks ago
And that was my outcome as well.
Dave advised me to go ahead with the build.
I did all everything was fine.
I think we may need to update the manual.
72
Johnny AC0BQ 

On Thu, Jul 12, 2018 at 10:50 PM Paul Cartwright <paul@...> wrote:
I have finished the audio amplifier portion of the build. I am not able to hear any hiss from the speaker while following the test instructions. The power circuit tested at 1.7 volts. I have double checked the components and connections, including comparing my circuit with the photos on the website. Everything looks correct. Any ideas on how to troubleshoot this problem? 

Paul Cartwright
WA0PAC

--
Check out the 4SQRP website at 4sqrp.com



Re: No hiss from speaker

Paul Cartwright
 

Thanks for the reply Johnny.  I did go ahead and finish it last night. It worked perfectly even though I did not get the hiss like the manual said.  

Interestingly, I had put the continuity tester across the primary coil of the transformer and heard a hiss from the speaker. So, I knew that the transformer through the speaker was wired correctly.

Paul WA0PAC

On Fri, Jul 13, 2018 at 6:37 AM, Johnny Matlock <jomatlock@...> wrote:
Gm Paul
I built mine a few weeks ago
And that was my outcome as well.
Dave advised me to go ahead with the build.
I did all everything was fine.
I think we may need to update the manual.
72
Johnny AC0BQ 

On Thu, Jul 12, 2018 at 10:50 PM Paul Cartwright <paul@...> wrote:
I have finished the audio amplifier portion of the build. I am not able to hear any hiss from the speaker while following the test instructions. The power circuit tested at 1.7 volts. I have double checked the components and connections, including comparing my circuit with the photos on the website. Everything looks correct. Any ideas on how to troubleshoot this problem? 

Paul Cartwright
WA0PAC

--
Check out the 4SQRP website at 4sqrp.com



Re: No hiss from speaker

Johnny AC0BQ
 

Gm Paul
I built mine a few weeks ago
And that was my outcome as well.
Dave advised me to go ahead with the build.
I did all everything was fine.
I think we may need to update the manual.
72
Johnny AC0BQ 

On Thu, Jul 12, 2018 at 10:50 PM Paul Cartwright <paul@...> wrote:
I have finished the audio amplifier portion of the build. I am not able to hear any hiss from the speaker while following the test instructions. The power circuit tested at 1.7 volts. I have double checked the components and connections, including comparing my circuit with the photos on the website. Everything looks correct. Any ideas on how to troubleshoot this problem? 

Paul Cartwright
WA0PAC

--
Check out the 4SQRP website at 4sqrp.com


No hiss from speaker

Paul Cartwright
 

I have finished the audio amplifier portion of the build. I am not able to hear any hiss from the speaker while following the test instructions. The power circuit tested at 1.7 volts. I have double checked the components and connections, including comparing my circuit with the photos on the website. Everything looks correct. Any ideas on how to troubleshoot this problem? 

Paul Cartwright
WA0PAC


Independence from Boredom!

Johnny AC0BQ
 

Good afternoon all:

Hope you are having a Safe and Happy Independence Day! 🇺🇸

I am pleased to announce the latest kit from the 4 sqrp Group.

Talk to anyone who was around during the Sputnik era and he will tell you how exciting it was when the first transistor radios were introduced.  For the first time, you could have a portable radio that could slip into your pocket, and affordable enough that young people could take their music with them anywhere.  The Four-State QRP Group has brought back the thrill of those days gone by with the Murania receiver!  Designed by David Cripe NM0S,  this simple kit is the perfect starter project to get young people interested in our hobby or to bring back those warm memories gained listening to your first portable radio.

 

Find more information at http://4sqrp.com/Murania.php

 

4SQRP is an IRS-recognized 509(a)(2) Public Charity for Scientific Purposes.  All proceeds from kit sales go towards the production of our annual OzarkCon information-sharing and education conference held in early April each year.

--------------------------------

Thanks 
72, 73
Johnny AC0BQ 
🇺🇸
--
Check out the 4SQRP website at 4sqrp.com


Test from ITP

WA0ITP
 

just a test

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


Re: Here is my finished Murania

David Wilcox
 

Yes, I did and the print was so small I only recognized things like C2, etc.   I normally would not have even thought of that when checking the parts with the BOM.  This AM I put my lighted loupe on and could finally recognize the ID that identifies with each cap.  It would be very helpful to others to have the 103, 47, etc., that is on each cap placed in the line of those parts on the bill of materials. It has been on previous kits. It was just trying to figure out what was which and I have been using caps and cap equivalent charts, cap meters, for years.  I had to stop and think more.  If I had been in Indiana at my grand kids home I might have not been able to figure it out without all my "helps". Hi!  But, there is a young ham next door to the grand son and he is always willing to help.  There is hope that out of my   six grand kids one will become a ham.  That's not the best odds..... When I was a kid half the kids on the block aspired to ham radio even though only a few of us made it with the help of our scout master. May he forever rest in peace.... What a guy.

Thanks.

Dave K8WPE

On Jun 29, 2018, at 9:33 AM, Paul Smith <n0nbd@...> wrote:

Dave, If you check the Pittsburg side of the front panel where the speaker goes is the parts list with designators

de Paul N0NBD


Sent from Outlook




From: MuraniaKit@4SQRP.groups.io <MuraniaKit@4SQRP.groups.io> on behalf of David Wilcox via Groups.Io <Djwilcox01@...>
Sent: Friday, June 29, 2018 9:17 AM
To: MuraniaKit@4SQRP.groups.io
Subject: Re: [MuraniaKit] Here is my finished Murania
 
I bought my kit at FDIM.  Did a parts check last night and all the parts are there. Am waiting for grand sons next visit to build it.  What a cute radio. May have to build this one for me and order ankther one for him.  Ha!

It would be helpful to include in the instructions which caps are which, ie., 103, 224, 47, etc.  I did check them with a cap checker.  The directions only show the values of the caps but not the designators on each cap.  The caps checked out but some were not close to the listed values so that could be very confusing to a noobie.  I know bypass caps can vary a lot and still work.

Dave K8WPE

On Jun 28, 2018, at 4:44 PM, Paul Smith <n0nbd@...> wrote:

I am listening to our local AM station as I write this. My Murania is one of the Beta build units. It works great. The build was simple as can be and I feel like the kid 60 years ago with my first transistor radio. I am the kitter on this kit and have a BIG bunch bagged up and ready to go to the PO. Watch the reflector and web page for the release. Rumor has it to be released JULY 4. You, your kids and grand kids will love this radio and the time spent spent building it.
<murania.jpg>


Re: Here is my finished Murania

Paul Smith
 

Dave, If you check the Pittsburg side of the front panel where the speaker goes is the parts list with designators

de Paul N0NBD


Sent from Outlook




From: MuraniaKit@4SQRP.groups.io <MuraniaKit@4SQRP.groups.io> on behalf of David Wilcox via Groups.Io <Djwilcox01@...>
Sent: Friday, June 29, 2018 9:17 AM
To: MuraniaKit@4SQRP.groups.io
Subject: Re: [MuraniaKit] Here is my finished Murania
 
I bought my kit at FDIM.  Did a parts check last night and all the parts are there. Am waiting for grand sons next visit to build it.  What a cute radio. May have to build this one for me and order ankther one for him.  Ha!

It would be helpful to include in the instructions which caps are which, ie., 103, 224, 47, etc.  I did check them with a cap checker.  The directions only show the values of the caps but not the designators on each cap.  The caps checked out but some were not close to the listed values so that could be very confusing to a noobie.  I know bypass caps can vary a lot and still work.

Dave K8WPE

On Jun 28, 2018, at 4:44 PM, Paul Smith <n0nbd@...> wrote:

I am listening to our local AM station as I write this. My Murania is one of the Beta build units. It works great. The build was simple as can be and I feel like the kid 60 years ago with my first transistor radio. I am the kitter on this kit and have a BIG bunch bagged up and ready to go to the PO. Watch the reflector and web page for the release. Rumor has it to be released JULY 4. You, your kids and grand kids will love this radio and the time spent spent building it.
<murania.jpg>


Re: Here is my finished Murania

David Wilcox
 

I bought my kit at FDIM.  Did a parts check last night and all the parts are there. Am waiting for grand sons next visit to build it.  What a cute radio. May have to build this one for me and order ankther one for him.  Ha!

It would be helpful to include in the instructions which caps are which, ie., 103, 224, 47, etc.  I did check them with a cap checker.  The directions only show the values of the caps but not the designators on each cap.  The caps checked out but some were not close to the listed values so that could be very confusing to a noobie.  I know bypass caps can vary a lot and still work.

Dave K8WPE

On Jun 28, 2018, at 4:44 PM, Paul Smith <n0nbd@...> wrote:

I am listening to our local AM station as I write this. My Murania is one of the Beta build units. It works great. The build was simple as can be and I feel like the kid 60 years ago with my first transistor radio. I am the kitter on this kit and have a BIG bunch bagged up and ready to go to the PO. Watch the reflector and web page for the release. Rumor has it to be released JULY 4. You, your kids and grand kids will love this radio and the time spent spent building it.
<murania.jpg>


Here is my finished Murania

Paul Smith
 

I am listening to our local AM station as I write this. My Murania is one of the Beta build units. It works great. The build was simple as can be and I feel like the kid 60 years ago with my first transistor radio. I am the kitter on this kit and have a BIG bunch bagged up and ready to go to the PO. Watch the reflector and web page for the release. Rumor has it to be released JULY 4. You, your kids and grand kids will love this radio and the time spent spent building it.