[hpsdr] Penelope sound quality

[Graham / KE9H]

Endo:

I would also support the recommendation of others that you run
the Penelope at higher RF power levels.  Put a 10 to 20 dB
attenuator on the output, if all that you need is 20 mW to drive
your amplifier, and run Penelope at several hundred milliwatts
output.  This will increase the dynamic range of the D to A
process.  It may help.  At least it is worth an experiment.

--- Graham / KE9H

==

ENDO wrote:
> ***** High Performance Software Defined Radio Discussion List *****
>
> Hi Joe ,
>
> I modified Initozy11.bat to 0x14 from 0x15.
> Apparently the audio becomes much better, however there is noise boosted(MIC
> gain 25). With 0x15, the noise is not so annoying, but 0x14 I can here very
> much the noise.
> To be honnest with you, the sound of TS-940S monitored( IF output monitored
> in TS-940S) with D-104 is MUCH MUCH better than Penelope sound.
> That's what I can say tonight. Coming weekend, I'll change the current TAPR
> made Penelope to another one that Gerd, DJ8AY made for further test.
>
> Tokio ENDO
> JA1CCA
>
> -----Original Message-----
> From: hpsdr-bounces at lists.openhpsdr.org
> [mailto:hpsdr-bounces at lists.openhpsdr.org]On Behalf Of Joe Martin K5SO
> Sent: Monday, October 12, 2009 10:05 PM
> To: hpsdr
> Subject: Re: [hpsdr] Penelope sound quality
>
>
> ***** High Performance Software Defined Radio Discussion List *****
>
> Tokio,
>
> Joe K1RQG and I had a similar issue with audio levels and Joe pointed
> out to me that if you modify the initozy11.bat file (e.g., in Notepad)
> so that the lines for Ozy and Penny that formerly read
>
> writeI2C 0xfffe 0x7 0x1a 0x2 0x08 0x15
> and
> writeI2C oxfffe 0x7 0x1b 0x2 0x08 0x15
>
> read instead
>
> writeI2C oxfffe 0x7 0x1a 0x2 0x08 0x14
> and
> writeI2C oxfffe 0x7 0x1b 0x2 0x08 0x14
>
> the audio gain is scaled much better and there is no overamplification
> nor distortion apparent.  With the front panel audio gain in PowerSDR
> set at about 20 the levels seem to be just fine!   Nice quality TX
> audio.
>
> Give it a try!  It'll probably fix you up.
>
> 73,  Joe K5SO
>
>
> On Oct 12, 2009, at 3:26 AM, ENDO wrote:
>
>   
>> ***** High Performance Software Defined Radio Discussion List *****
>>
>> I forgot yo tell the 3rd order  IMD of Penelope. It is quite good ,
>> more
>> than 70dB. The output of TS-680S is 36dB.
>>
>> -----Original Message-----
>> From: hpsdr-bounces at lists.openhpsdr.org
>> [mailto:hpsdr-bounces at lists.openhpsdr.org]On Behalf Of ENDO
>> Sent: Monday, October 12, 2009 6:24 PM
>> To: hpsdr
>> Subject: [hpsdr] Penelope sound quality
>>
>>
>> ***** High Performance Software Defined Radio Discussion List *****
>>
>> I've just started to use Penelope for the transmission. So far I
>> enjoyed
>> Mercury for receiving.
>>
>> I had several SSB conversations on the air on 3.5MHz for the first
>> time
>> using Penelope. However my friends all told me the sound is worse than
>> before. I used to use TS-940S and D-104, they reported the sound was
>> good.
>> I monitored the sound by depressing MON button on the PowerSDR
>> panel. The
>> sound is normal to me, then I monitored the transmission by using
>> TS-940S,
>> then it is not distored but not good audio, say, cracked.
>>
>> Do you have any suggestion to remedy the problem?
>>
>> My configuration is  the following;
>>
>> CPU Dell 8400 3.4GHz; CPU utilization is less than 20%.
>> HPSDR Firmware; Ozy FX2 20090524, Ozy 16, Mercury 27, Penelope 12
>> Mic Gain 10
>> Power Indication around 20mW on PowerSDR
>> MIcrophone D-104 inserted to MIC input of Penny
>> PA is TS-680S, the phenomeno is almost same without TS-680S
>> PowerSDR KD5TFD 22 Aug 2009
>>
>> Regards,
>>
>> Tokio ENDO
>> JA1CCA
>>
>>     


 1255448970.0