[hpsdr] Penelope Output Power

[Phil Harman]

Hi Gerd,

You are correct that PowerSDR does not have a control to set the Tx drive 
level on 6m. We need to speak nicely to our PC programmer friends and ask if 
they can add a control!

In the mean time you could deselect 'PA Present' in which case the power 
output will be controlled by the Drive control. However, you then need to be 
sure that you don't overdrive your amplifier on the lower bands.

Penelope has an ALC loop built into the FPGA code to limit the output power 
to 0.5w. This is to ensure that the IP3 performance of the power amplifier 
stage is very high. If this  not enough power then it would be  possible to 
disable the ALC in the AGC so you can get more power out but this will also 
degrade the IP3 figures.  From memory I think it was possible to get 1w PEP 
out but I needed perhaps 13v for this.

Hope that helps.

73's Phil...VK6APH



----- Original Message ----- 
From: "Gerd Loch" <g.loch at nt-electronics.de>
To: <hpsdr at hpsdr.org>
Sent: Saturday, August 16, 2008 4:39 PM
Subject: [hpsdr] Penelope Output Power


> ***** High Performance Software Defined Radio Discussion List *****
>
> I have installed a TX/RX switching board for my Mercury-EU/Peneolpe TRX 
> and
> find now that the transmit pwr is probably 0.25W in cw mode on 6m ( I 
> cannot
> measure it precisely). I believe to remember that I found a somewhat 
> higher
> pwr before but I can not find where to adjust it. Only pwr leds 2,3,4 
> switch
> on while keying. Additionally I realized not before that there are no 6m 
> PA
> settings in the console probably because the SDR1K had no PA on 6m. I have
> selected SDR1K in the Hardware Settings of PowerSDR and I am using 
> PowerSDR
> (KD5TFD 13Jul2008).
>
> How can I get higher power out of Penelope, at least 0,5W or better 1 W?
> What is planned to make PA settings for 6m available?
>
> 73, Gerd
> DJ8AY
>
> _______________________________________________
> HPSDR Discussion List
> To post msg: hpsdr at hpsdr.org
> Subscription help: http://lists.hpsdr.org/listinfo.cgi/hpsdr-hpsdr.org
> HPSDR web page: http://hpsdr.org
> Archives: http://lists.hpsdr.org/pipermail/hpsdr-hpsdr.org/
>
> No virus found in this incoming message.
> Checked by AVG - http://www.avg.com
> Version: 8.0.138 / Virus Database: 270.6.3/1614 - Release Date: 8/15/2008 
> 5:29 PM
>
>
> 


 1218949946.0