[hpsdr] Penelope Minimum Power

[Willi Reppel]

Hi Keith,

I am using a Pi-network resistive attenuator as described in the ARRL 
Handbooks to connect Penny to an Icom 735 PA module. The maximum input power 
to the Icom module is 1mW which results in 125 W output. I use a 25 dB 
resistive attenuator between Penny and the input of the PA.
A friend of mine uses the same PA module and relied on software and the 
adjustable PA settings in the PowerSDR setup. Once he made a reset or 
updated PowerSDR and his PA settings were replaced by default values. The PA 
module did not accept 0.5 W input and sent smoke signals.
vy 73 de
Sm6OMH  Willi
----- Original Message ----- 
From: <n3ick at cox.net>
To: "Joe Martin K5SO" <k5so at valornet.com>; <hpsdr at hpsdr.org>
Sent: Monday, April 27, 2009 8:26 PM
Subject: Re: [hpsdr] Penelope Minimum Power


> ***** High Performance Software Defined Radio Discussion List *****
>
> Thanks Joe,
>  I will go the route of using an attenuator and set the PA gain in PSDR 
> to where I see 100W on all bands.
> 73's de N3ICK
>
> ---- Joe Martin K5SO <k5so at valornet.com> wrote:
>> ***** High Performance Software Defined Radio Discussion List *****
>>
>> Hi Keith,
>>
>> If you run Penelope at power levels lower than about 200mW or so your
>> dynamic range will suffer so it's best to use an external attenuator
>> and always run Penelope at a healthy output level from the board itself.
>>
>> If you only need 2 mW or less output you can pull J2 and take the rf
>> out from pins 1 & 3 on J2 instead of from the BNC connector.
>> Actually, you can lift the center conductor pin on the BNC connector
>> from the board and use a small coaxial line from the BNC over to J2 to
>> make a nice configuration.  Doing so bypasses the output amplifier
>> stage on Penelope and allows you to run with full dynamic range but
>> with a very low power out level.
>>
>> If you need more than 2mW out an external attenuator with the normal
>> Penelope configuration is best.
>>
>> 73,  Joe K5SO
>>
>> On Apr 27, 2009, at 8:46 AM, <n3ick at cox.net> wrote:
>>
>> > ***** High Performance Software Defined Radio Discussion List *****
>> >
>> > Was wondering if anyone had already checked what the stable minimum
>> > output power or Penelope is? Setting up a PA to use with it I need
>> > to use low power settings to prevent overdriving the PA. Maybe would
>> > be best to just put a fixed attenuator in line because of software
>> > changes that may occur. Any info and thoughts appreciated thanks.
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