Date   

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

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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.

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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


Johnny, can you call me please

Timothy East
 

Johnny, this is Tim, K0EMP

Number is 316-200-6037.

Would you please contact me?

Tim


Re: 75A

WA4LLR <wa4llr@...>
 

Another 75A question. Just built one. The xmit carrier output is 1 watt. The RX sensitivity is approx 15 microvolts and the RX frequency is offset approx. 66khz from the xmit frequency. What did I do wrong? Thanks for any input.
Dave



Sent from my Verizon, Samsung Galaxy smartphone

-------- Original message --------
From: "ohwenzelph via groups.io" <Ohwenzelph@...>
Date: 5/18/20 10:29 AM (GMT-05:00)
To: main@4sqrp.groups.io
Subject: Re: [4SQRP] 75A

Re Q2: Is this correct?




locked #ADMIN The "Rodeo" Thread Has Been Deleted #ADMIN

Tim N9PUZ
 

The "Rodeo" thread has been deleted and the original poster has been put on fully moderated status. I don't like doing that but if any subscriber isn't clever enough to follow our simple list rules that's what we promised would happen. I'm sorry that there were so many messages in the thread before I killed it off but I work for a living.

Tim N9PUZ
4SQRP Volunteer List Moderator


Re: 40 AND 80 METER NET REPORT

John - KK4ITX
 

Paul,

For Park QRP I now have a Yaesu FT-818 w/CW 300 filter but have not updated my QRZ page yet.  At the base, as used last night, I use my Yaesu FT-450D with its DSP and Filters @ 300 CW and a 9:1 35ft EF Inv V.  

What I need to work on 7122 is a super beam but due to HOA there's no chance.  I realize that they have the right to be there but it seems that they are centered on 7125 and probably at QRO level, in Spanish which I don't speak with probably a slightly loose transmitter.  I simply cannot overcome their signals with all of my weapons.  I can just almost see the edge of the Gulf of Mexico from my rooftop so I have a good shot to Latin America. They do disappear around 7120.

When Bill, KV6Z ran the Net I could work him FB just about every time but the SB group was not on the air then.

I guess that I will not even try if I hear them on, I haven't been able to hit the Net from Maine either but that's not surprising due to the trees in the campground there, I may try from the beach this year as the is now open till 2200L.

Thanks for your concern, we'll not loose faith !

73,

John
KK4ITX





Click Here for Zephyrhills Area Amateur Radio Club
Many of life's failures are people who
did not realize how close they were to
success when they gave up.
       Thomas A. Edison     


On Thursday, May 28, 2020, 10:54:12 AM EDT, Paul Goemans <wa9pwp@...> wrote:


John,
  Does your X1M Xiegu’s receiver have a narrow CW filter? I didn’t see any mention in the Quick Reference manual. Yes there is adjacent SSB on 40 meters but a good narrow CW filter will kill most of it. Or if you are using your FT818, does that have the narrow CW filter installed? If not, you need an external narrow audio filter!  
 
Paul Goemans WA9PWP
Stoughton, WI
 
 
Sent: Wednesday, May 27, 2020 10:16 PM
Subject: Re: [4SQRP] 40 AND 80 METER NET REPORT
 
I could barely hear CW over the SB on adjacent frequency so I dropped down to the WSPR area and ran it for a few minutes around 9:20 EDT.  The indicators are that the Band was good from my area except for the QRM. See attached.  It’s frustrating when you know you should be able to do something but continuously get skunked by Legal QRM.
 
John, KK4ITX
 
On May 27, 2020, at 22:24, Johnny AC0BQ <jomatlock@...> wrote:

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