[TenTec] Argosy 2

[radioal]

I would suspect a leaky C13 throwing off your dc voltage on pin 1.    The other small electrolytics around u2 are also probably suspect as well.
 

 
73,
 

 
Al
 
KD4TMW
 

 

 
 
 
 
 
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> On Jun 11, 2020 at 12:00 PM, tentec-request  <tentec-request at contesting.com>  wrote:
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>  
>  Send TenTec mailing list submissions to tentec at contesting.com  To subscribe or unsubscribe via the World Wide Web, visit  http://lists.contesting.com/mailman/listinfo/tentec  or, via email, send a message with subject or body 'help' to tentec-request at contesting.com  You can reach the person managing the list at tentec-owner at contesting.com  When replying, please edit your Subject line so it is more specific than "Re: Contents of TenTec digest..." Today's Topics: 1. Re: Argosy 2 (William Redfearn) 2. Argosy 2 (ROLAND HOWELL) 3. Re: Argosy 2 (James Duffer) 4. Re: Argosy 2 (Mike Bryce) ---------------------------------------------------------------------- Message: 1 Date: Wed, 10 Jun 2020 23:43:40 +0000 (UTC) From: William Redfearn  bellsouth.net>  To: Discussion of Ten-Tec Equipment  contesting.com>  Subject: Re: [TenTec] Argosy 2 Message-ID:  <863155809.2629317.1591832620991 at mail.yahoo.com>  Content-Type: text/plain; charset=UTF-8 Snowy, Since CW is working, you're definitely lookin
g in the right  area.You  should be able to use a scope to look at the audio signal through both both sections of U2 into the balanced modulator (U1).You may want to check the audio connections out/back to the mike gain pot which is connected between the sections of U2. Also recall that the manual specs a high impedance microphone for the radio. 73,?Dave RedfearnARS?N4ELM? Lafayette, LAQRL? de N4ELM/qrp ------------------------------ Message: 2 Date: Thu, 11 Jun 2020 09:27:13 +0100 (BST) From: ROLAND HOWELL  <snowy.howell at btinternet.com>  To: Discussion of Ten-Tec Equipment  contesting.com>  Subject: [TenTec] Argosy 2 Message-ID:  <1054915b.eff.172a27d8159.Webtop.132 at btinternet.com>  Content-Type: text/plain; charset=UTF-8; format=flowed Hi all Thanks to Martin and Dave for the advice so far. One thing is puzzling me with the radio and that is this, When I switch to SSB (upper or lower) the radio transmits what ever power level has been set with the drive control, I have always thoug
ht that it only transmitted with audio is applied via the mic, or have I got it wrong!. I am wondering if I have additional problems. The voltage levels on the 4558 appear to be correct, I have changed it anyway but the voltage on U1 pin 1 is only  <3v not what is written, all other pin voltages are correct. So more head scratching today ( I must be careful of getting splinters ha ha). stay well and happy 73 Snowy G0HZE ------------------------------ Message: 3 Date: Thu, 11 Jun 2020 12:40:12 +0000 From: James Duffer  hotmail.com>  To: Discussion of Ten-Tec Equipment  contesting.com>  Cc: ROLAND HOWELL  <snowy.howell at btinternet.com>  Subject: Re: [TenTec] Argosy 2 Message-ID:  BYAPR03MB3864.namprd03.prod.outlook.com>  Content-Type: text/plain; charset="us-ascii" Is their any modulation of the output when you do that? Is there hum, or a signal (envelope) on the output, if so, you may have some sort of audio oscillation modulating the output if it is a single sinusoidal it would create
 a CW tone. The modulator itself may be unbalanced....good luck with your troubleshooting. 73, Jim, WD4AIR ________________________________ From: TenTec hotmail.com at contesting.com>  on behalf of ROLAND HOWELL via TenTec  contesting.com>  Sent: Thursday, June 11, 2020 3:27 AM To: Discussion of Ten-Tec Equipment  contesting.com>  Cc: ROLAND HOWELL  <snowy.howell at btinternet.com>  Subject: [TenTec] Argosy 2 Hi all Thanks to Martin and Dave for the advice so far. One thing is puzzling me with the radio and that is this, When I switch to SSB (upper or lower) the radio transmits what ever power level has been set with the drive control, I have always thought that it only transmitted with audio is applied via the mic, or have I got it wrong!. I am wondering if I have additional problems. The voltage levels on the 4558 appear to be correct, I have changed it anyway but the voltage on U1 pin 1 is only  <3v not what is written, all other pin voltages are correct. So more head scratching today (
 I must be careful of getting splinters ha ha). stay well and happy 73 Snowy G0HZE _______________________________________________ TenTec mailing list TenTec at contesting.com   http://lists.contesting.com/mailman/listinfo/tentec  ------------------------------ Message: 4 Date: Thu, 11 Jun 2020 10:31:54 -0400 From: Mike Bryce  sssnet.com>  To: Discussion of Ten-Tec Equipment  contesting.com>  Cc: ROLAND HOWELL  <snowy.howell at btinternet.com>  Subject: Re: [TenTec] Argosy 2 Message-ID:  sssnet.com>  Content-Type: text/plain; charset=utf-8 I?d sure take a peek at the balanced modulator. It appears that carrier is getting though. I don?t recall if they used didoes or a IC. Mike, WB8VGE  www.theheathkitshop.com   >  On Jun 11, 2020, at 4:27 AM, ROLAND HOWELL via TenTec  contesting.com>  wrote:  >   >   >  Hi all  >   >  Thanks to Martin and Dave for the advice so far.  >   >  One thing is puzzling me with the radio and that is this, When I switch to SSB (upper or lower) the radio transmits w
hat ever power level has been set with the drive control, I have always thought that it only transmitted with audio is applied via the mic, or have I got it wrong!.  >   >  I am wondering if I have additional problems.  >   >  The voltage levels on the 4558 appear to be correct, I have changed it anyway but the voltage on U1 pin 1 is only  <3v not what is written, all other pin voltages are correct.  >   >  So more head scratching today ( I must be careful of getting splinters ha ha).  >   >  stay well and happy  >   >  73  >   >  Snowy G0HZE  >  _______________________________________________  >  TenTec mailing list  >  TenTec at contesting.com   >   http://lists.contesting.com/mailman/listinfo/tentec   >  ------------------------------ Subject: Digest Footer _______________________________________________ TenTec mailing list TenTec at contesting.com   http://lists.contesting.com/mailman/listinfo/tentec  ------------------------------ End of TenTec Digest, Vol 210, Issue 8 ***************
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