[hpsdr] Penelope Minimum Power

[Neal Campbell]

Is the 735 the best value out there on getting a used PA section to
work with Mercury/Penny? They can be had very reasonably and would
love to see one fly!

73
Neal Campbell
Abroham Neal Software
Programming Services for Windows, OS X and Linux
www.abrohamnealsoftware.com
(540) 242 0911




On Mon, Apr 27, 2009 at 9:34 PM, Willi Reppel <wi.re at telia.com> wrote:
> ***** High Performance Software Defined Radio Discussion List *****
>
> 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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