Date   

Re: problem with my 4SQRP Ozark Patrol Radio (Fixed!)

Herb Parsons <radioherb@...>
 

Hi John,
I just found out that the connection between the regen pot and R3 was open. I ran a wire between them and the set came alive. Thanks so much for your help.
Herb



-----Original Message-----
From: John Lonigro <jonigro@...>
To: main <main@4SQRP.groups.io>
Sent: Mon, Jun 1, 2020 8:34 am
Subject: Re: [4SQRP] problem with my 4SQRP Ozark Patrol Radio

Just thinking out loud here, but what if both D2 and D3 were installed backwards?  I don't have an Ozark Patrol.  I'm just relying on Curt's observations.

72,
John, AA0VE

On 6/1/20 6:28 AM, Curt via groups.io wrote:
Herb

No voltage on Q1 base implies short to ground in that circuit.  Absent an internal B-E short, the voltage should be at least 1/2V across D2 and D3.  Since you have replaced that transistor, the other possibles would be BOTH D2 & D3 shorted ( not likely ), R10 (not likely), or C4 ( possible but not likely ).

Did you ever try headphones? 

Am at a loss. Sorry.

Curt


Re: problem with my 4SQRP Ozark Patrol Radio (Fixed!)

Herb Parsons <radioherb@...>
 

Hi Curt,

My problem is solved. While checking voltages on R3 and the regen pot, I found 0 volts on R3. The connection between R3 and the pot was open! I ran a wire from the pot to R3 and the set came alive. Thanks so much for your help!

Herb


-----Original Message-----
From: Curt via groups.io <rhulett1@...>
To: main <main@4SQRP.groups.io>
Sent: Mon, Jun 1, 2020 3:46 pm
Subject: Re: [4SQRP] problem with my 4SQRP Ozark Patrol Radio

Just for info, my radio (which works) has following readings

On Mon, Jun 1, 2020 at 09:59 AM, n5ib_2 wrote:
1) battery voltage, at the battery +terminal, or at the top of R1 = 8.6VDC

2) voltage at the junction of R1 and R2, or at the + lead of C3 = 7.9

3) voltage at the top of the regen pot, or + terminal of C13 = 7.85

4) voltage at the junction of R3 and the regen pot (other end of the pot) = 3.64
... also check that this voltage decreases as you swing the regen pot through its range towards full clockwise
... then put the pot back to full counterclockwise for the rest of these checks

5) voltage at the R3 / R10 junction, or the base of Q1 = 0.53
Curt KB5JO


Re: problem with my 4SQRP Ozark Patrol Radio (Fixed!)

Herb Parsons <radioherb@...>
 

Hi Jim,

Thank you for pointing me to the problem. When I got to #4 voltage check on your list, I found 0 volts on R3. I found the connection from R3 to the pot was open! As soon as I connected a wire from R3 to the pot, the set came alive. Thanks so much for your help. It is so appreciated!

Herb


-----Original Message-----
From: n5ib_2 <n5ib@...>
To: main <main@4SQRP.groups.io>
Sent: Mon, Jun 1, 2020 12:59 pm
Subject: Re: [4SQRP] problem with my 4SQRP Ozark Patrol Radio

Hi Herb,

I'm presuming you've fixed the earlier problem of low voltage on the Q3 collector?

Before replacing any more parts, do a little voltage detective work for us. This will give some clues as to whether the problem is Q1 itself, or its biasing circuit. With the regen pot fully counterclockwise (minimum resistance, maximum regeneration) measure the following with respect to ground (record the full resolution of your voltmeter):

1) battery voltage, at the battery +terminal, or at the top of R1

2) voltage at the junction of R1 and R2, or at the + lead of C3

3) voltage at the top of the regen pot, or + terminal of C13

4) voltage at the junction of R3 and the regen pot (other end of the pot)
... also check that this voltage decreases as you swing the regen pot through its range towards full clockwise
... then put the pot back to full counterclockwise for the rest of these checks

5) voltage at the R3 / R10 junction, or the base of Q1

The too high voltage at Q1 collector could be due to a short to ground at the base of Q1, or it couod be due to an open circuit in its base bias circuit. The above measurements ought to narrow it down.

Now, if you have time... temporarily unsolder and lift the base lead of Q1 and repeat the measurements above. For (5) above probe the PCB pad for the base of Q1 , not the base lead itself.

Neither a backwards nor forwards D2 and/or D3 would short Q1-B to ground unless *both* diodes were shorted.

Jim, N5IB



Re: problem with my 4SQRP Ozark Patrol Radio

Curt
 

Just for info, my radio (which works) has following readings

On Mon, Jun 1, 2020 at 09:59 AM, n5ib_2 wrote:
1) battery voltage, at the battery +terminal, or at the top of R1 = 8.6VDC

2) voltage at the junction of R1 and R2, or at the + lead of C3 = 7.9

3) voltage at the top of the regen pot, or + terminal of C13 = 7.85

4) voltage at the junction of R3 and the regen pot (other end of the pot) = 3.64
... also check that this voltage decreases as you swing the regen pot through its range towards full clockwise
... then put the pot back to full counterclockwise for the rest of these checks

5) voltage at the R3 / R10 junction, or the base of Q1 = 0.53
Curt KB5JO


Re: 75A - Kits in the 190 Serial Number Range - Do They Need The Modification?

ohwenzelph
 

What about removing R47 and the first hundred kits?


Re: problem with my 4SQRP Ozark Patrol Radio

n5ib_2
 

Hi Herb,

I'm presuming you've fixed the earlier problem of low voltage on the Q3 collector?

Before replacing any more parts, do a little voltage detective work for us. This will give some clues as to whether the problem is Q1 itself, or its biasing circuit. With the regen pot fully counterclockwise (minimum resistance, maximum regeneration) measure the following with respect to ground (record the full resolution of your voltmeter):

1) battery voltage, at the battery +terminal, or at the top of R1

2) voltage at the junction of R1 and R2, or at the + lead of C3

3) voltage at the top of the regen pot, or + terminal of C13

4) voltage at the junction of R3 and the regen pot (other end of the pot)
... also check that this voltage decreases as you swing the regen pot through its range towards full clockwise
... then put the pot back to full counterclockwise for the rest of these checks

5) voltage at the R3 / R10 junction, or the base of Q1

The too high voltage at Q1 collector could be due to a short to ground at the base of Q1, or it couod be due to an open circuit in its base bias circuit. The above measurements ought to narrow it down.

Now, if you have time... temporarily unsolder and lift the base lead of Q1 and repeat the measurements above. For (5) above probe the PCB pad for the base of Q1 , not the base lead itself.

Neither a backwards nor forwards D2 and/or D3 would short Q1-B to ground unless *both* diodes were shorted.

Jim, N5IB


locked #ADMIN Periodic Reminder About Group Rules #ADMIN

main@4SQRP.groups.io Group Moderators <main@...>
 

PERIODIC REMINDER

The 4SQRP Mailing List exists for several purposes:

  • To encourage the discussion of QRP activities and techniques, especially those that relate to 4SQRP events.
  • To provide support for 4SQRP kits and products on the main list or in one of the specialty subgroups.
  • To share your QRP operating experiences and techniques.
The 4SQRP Mailing list IS NOT for the purpose of supporting the products of other companies or clubs. If you have a question about their products or if you have a service issue with another vendor, this is not the place to discuss it. Contact them directly. We're sorry you had a problem but we aren't here to help everyone in the world.

If you choose to ignore our simple rules don't be surprised if you receive a note from a moderator, get yourself placed on permanent moderation, or get banned from the list. We are all reasonable people and are not vindictive. However, we can be provoked. The Moderators are volunteers. We get no pay, no free kits, etc.

One last comment; Sending a message outside the guidelines but marking it as "off topic" is sure fire way to get placed on moderation as you have clearly demonstrated that you don't believe the rules apply to you.


Re: problem with my 4SQRP Ozark Patrol Radio

John Lonigro
 

Just thinking out loud here, but what if both D2 and D3 were installed backwards?  I don't have an Ozark Patrol.  I'm just relying on Curt's observations.

72,
John, AA0VE

On 6/1/20 6:28 AM, Curt via groups.io wrote:
Herb

No voltage on Q1 base implies short to ground in that circuit.  Absent an internal B-E short, the voltage should be at least 1/2V across D2 and D3.  Since you have replaced that transistor, the other possibles would be BOTH D2 & D3 shorted ( not likely ), R10 (not likely), or C4 ( possible but not likely ).

Did you ever try headphones? 

Am at a loss. Sorry.

Curt


Re: problem with my 4SQRP Ozark Patrol Radio

Curt
 

Herb

No voltage on Q1 base implies short to ground in that circuit.  Absent an internal B-E short, the voltage should be at least 1/2V across D2 and D3.  Since you have replaced that transistor, the other possibles would be BOTH D2 & D3 shorted ( not likely ), R10 (not likely), or C4 ( possible but not likely ).

Did you ever try headphones? 

Am at a loss. Sorry.

Curt


Re: 75A - Kits in the 190 Serial Number Range - Do They Need The Modification?

JOE CULWELL
 

Only the original N75 need the mod.  All N75a include the mod.  Serial number numbers 1-100 are N75.  Serial number 101 and above are N75a.  You are good to go.  de wb0yfl


On Sun, May 31, 2020 at 2:49 PM Bruce W1UJR <w1ujr@...> wrote:

I read that the early 75A kits needed a separate circuit board due to receiver performance, with inadequate AGC range and objectionable distortion. 

I bought 5 of these kits to build and also to give away to younger hams. 

When do these mods apply to the kits, is it in my serial range?

Thanks!


Re: problem with my 4SQRP Ozark Patrol Radio

Jerome Wysocki
 

Hi Herb,
The fact that it squeals seems to indicate the audio section is at least working. Not quite sure why voltages around Q1 are not right, so for some reason the problem seems to gravitate there. For Q1, I tried replacing it with a 2N2222, and that worked fine for me, but still your incorrect voltages around Q1 gets me wondering.
... Jerry Wysocki, KC9JXE


Re: problem with my 4SQRP Ozark Patrol Radio

Herb Parsons <radioherb@...>
 

Curt,

I get nothing from the speaker except slight noise as you turn the volume control up and down. If I touch my fingers from Q1 collector to Q3 collector, I get a loud squeal from the speaker. I double checked all parts placement and polarities. I've replaced all the transistors. I checked all the voltages listed and all were OK except the voltages on the collector of Q1 is 7.8 volts and the base reads 0 volts. I even removed L1 and reversed it. I would love to get this radio to work. I have made quite few tube regens, but this my first transistor regen set. Do you have any suggestions as to where I should go from here? Thanks so much for anything you might suggest.
   
Herb Parsons


-----Original Message-----
From: Curt via groups.io <rhulett1@...>
To: main <main@4SQRP.groups.io>
Sent: Sun, May 31, 2020 4:30 pm
Subject: Re: [4SQRP] problem with my 4SQRP Ozark Patrol Radio

Herb,

Any progress getting the radio to function?

Curt KB5JO


Re: How much did Hilltopper kits cost?

AG1P Ron
 

$90 plus ship

72 - Ron - AG1P

 

From: main@4SQRP.groups.io [mailto:main@4SQRP.groups.io] On Behalf Of Jim Long
Sent: Sunday, May 31, 2020 2:01 PM
To: main@4SQRP.groups.io
Subject: [4SQRP] How much did Hilltopper kits cost?

 

When they were available, how much were Hilltopper kits?

Jim
WW9H


How much did Hilltopper kits cost?

Jim Long
 

When they were available, how much were Hilltopper kits?

Jim
WW9H


Re: problem with my 4SQRP Ozark Patrol Radio

Curt
 

Herb,

Any progress getting the radio to function?

Curt KB5JO


Hilltoppers for QCX trade?

Jess Gypin
 

I have complete and working QCXs by QRP Labs that I would be interested in trading. 20 and 40 meters. Both fully functional, aligned and running.
Both are in 3D printed cases. 20 meter rig is about 3 watts out and the 40 meter rig 5 watts out. I missed the Hilltopper kits and would like to try them. Will trade for completed and working rigs or unbuilt kits. Pics attached.
Jess AE0CW


75A - Kits in the 190 Serial Number Range - Do They Need The Modification?

Bruce W1UJR <w1ujr@...>
 

I read that the early 75A kits needed a separate circuit board due to receiver performance, with inadequate AGC range and objectionable distortion. 

I bought 5 of these kits to build and also to give away to younger hams. 

When do these mods apply to the kits, is it in my serial range?

Thanks!


Re: Nouveau 75A PTT

Bruce W1UJR <w1ujr@...>
 

Hi Jerry, I know that this post is from last month, but I just finished up my Nouveau 75 and would love to test it on air, up for a sked?

 

73 Bruce W1UJR


Re: 75A

nm0s_qrp
 

How did you determine the frequency offset?


Re: 40 AND 80 METER NET REPORT

w2sh@...
 

That "Almost!" is surprising.  Frankly I had no business getting into the 80m mix.  I could hear Johnny but could barely copy 10 percent of whatever he was sending.  Dropping my call sign a couple of times was just wishful thinking.  But Johnny's sharp ears heard it.

Pushing 5 watts across 1,100 miles in late May is a daunting challenge.

I'll try to be more sensible henceforth.

72,

 Charles (aka Chas), W2SH




From: main@4SQRP.groups.io <main@4SQRP.groups.io> on behalf of Johnny AC0BQ <jomatlock@...>
Sent: Wednesday, May 27, 2020 22:24
To: 4sqrpio <4SQRP@groups.io>
Subject: [4SQRP] 40 AND 80 METER NET REPORT
 
Ge Group 
Fair net tonight, some qsb and a few static crashes. 

40 Meter Check in's were: 
W2SH 
N4MJ
N4DR
N4ELM
WA9PWP
KW4JS

80 METER CHECK IN'S WERE:
WA9PWP Double 
K4EQ 
N0YJ
W2SH Almost! 

Thanks all 
Stay Safe 
72 
Johnny AC0BQ

--
Charles Moizeau, W2SH