[hpsdr] Penelope no modulation

[Helmut]

Hi guys,

like all HPSDR TX circuitry  Penelope employs the TLV 320 audio codec for the microphone path. Please note that this chip is designed in particular for electret-microphones, provides an on-chip bias and shows a high impedance microphone of typically 14 Kohm.  If you use a low impedance dynamic microphone, you can be forced to compensate this mismatch with this 20 dB-boost amp. In this case be carefully to drive the on-chip ADC not into clipping. 
Check the correct jumper selection documented in the Penelope manual (ring, tip, bias etc.). Check your mic plug too, as I know that some ‘Heils’ are not wired acc. to the standard. BTW the tone-test of PowerSDR is meaningless for the mic path.

73, Helmut, DC6NY

-----Ursprüngliche Nachricht-----
Von: Hpsdr [mailto:hpsdr-bounces at lists.openhpsdr.org] Im Auftrag von Dean
Gesendet: Donnerstag, 14. Januar 2016 12:30
An: Gary Beech
Cc: HPSDR List
Betreff: Re: [hpsdr] Penelope no modulation

***** High Performance Software Defined Radio Discussion List *****

Gary, Paul,

I had same thing using Penelope with a Heil mike.  Like you I double checked everything.  Finally I checked the 20db boost box in transmit (I think it is in that option) and it produced modulation.  Works just fine now.  No mike I have will produce any modulation without that 20db boost.  Cheers. Dean. VK5LB.

Sent from my iPad

> On 14 Jan 2016, at 21:48, Gary Beech <garybeech at bigpond.com> wrote:
> 
> ***** High Performance Software Defined Radio Discussion List *****
> 
> Thanks Paul,
> It is getting late here in VK I will have a look tomorrow. I really appreciate you assistance
> 
> Regards Gary
> 
> -----Original Message-----
> From: Paul Fletcher [mailto:paul_fletcher at me.com] 
> Sent: Thursday, January 14, 2016 22:15
> To: Gary Beech
> Cc: HPSDR List
> Subject: Re: [hpsdr] Penelope no modulation
> 
> Maybe I wasn’t clear - in the HPSDR software you can select various things to show on the meter within the software on TX and one of them is the mic level which is just about the earliest part of the audio chain. If this isn’t showing any input there could be a number of things going on. There could be a hardware issue (wrong mic connection, wrong jumper selection on Penelope for where the mic audio is coming from, wrong wiring or a Problem with Penny) or a software issue - mic configuration is wrong (mic source can be selected to Janus if that option is selected), VAC is enabled and overriding the mic input, mic gain is too low amongst others.
> 
> Reds,
> Paul.
>> On 14 Jan 2016, at 11:08, Gary Beech <garybeech at bigpond.com> wrote:
>> 
>> Hi Paul,
>> I am using a receiver and Spectrum Analyser to monitor the output from Penelope.
>> 
>> I cannot confirm at this stage that the audio is getting hrough to pin 
>> 18 of the TLV320A/C23B Chip. It has close pin spacing.
>> 
>> Regards Gary
>> 
>> 
>> 
>> -----Original Message-----
>> From: Paul Fletcher [mailto:paul_fletcher at me.com]
>> Sent: Thursday, January 14, 2016 22:00
>> To: Gary Beech
>> Cc: hpsdr at openhpsdr.org
>> Subject: Re: [hpsdr] Penelope no modulation
>> 
>> That's good news then. Do you see anything on the TX meter when you select the various options starting at mic level then working through?
>> 
>> 
>> Regards,
>> Paul
>> 
>>> On 14 Jan 2016, at 10:56, Gary Beech <garybeech at bigpond.com> wrote:
>>> 
>>> Hi Paul,
>>> When I select AM or FM I get RF out no modulation
>>> 
>>> Nothing on SSB.
>>> 
>>> Regards Gary
>>> 
>>> From: Paul Fletcher [mailto:paul_fletcher at me.com]
>>> Sent: Thursday, January 14, 2016 21:45
>>> To: Gary Beech
>>> Cc: hpsdr at openhpsdr.org
>>> Subject: Re: [hpsdr] Penelope no modulation
>>> 
>>> Sorry for autocorrect fail - obviously should read "if you don't"
>>> 
>>> Regards,
>>> Paul
>>> 
>>> On 14 Jan 2016, at 10:43, Paul Fletcher <paul_fletcher at me.com> wrote:
>>> ***** High Performance Software Defined Radio Discussion List ***** 
>>> Do you get any RF out when you use the tune function? If you downturn it's something in the configuration - if you don't (and the tune drive level isn't 0) there is something wrong with Penny.
>>> 
>>> Regards,
>>> Paul
>>> 
>>> On 14 Jan 2016, at 10:40, Gary Beech <garybeech at bigpond.com> wrote:
>>> ***** High Performance Software Defined Radio Discussion List ***** 
>>> Hi All,
>>> 
>>> I am having trouble with my Penelope Transmitter firmware version 1.8.
>>> Running PowerSDR OpenHPSDR mRX PS v3.3.6 (11/16/15)
>>> 
>>> I have removed jumpers J10 and J11 ( these are the I2C jumpers which 
>>> if left in I read upset the CODEC)
>>> 
>>> I am using a Atlas mother board with
>>> Excalibur reference,
>>> Mercury Receiver version 3.4 firmware Métis  Ethernet interface 
>>> version 3.0 firmware.
>>> 
>>> These are all working well.
>>> 
>>> When I operate the MOX button I have no modulation, I have confirmed the audio is at the Aud. jumper.
>>> 
>>> Any ideas.
>>> 
>>> Thank you
>>> 
>>> 73 Gary vk2kyp
>>> 
>>> 
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