[hpsdr] Penelope Minimum Power

Mon Apr 27 14:25:56 PDT 2009

Hi Neal,
I got my  735 PA-module from an Icom representative in Sweden. He had 
several pieces as spare parts on the shelf for many years and I paid $100 
for one unit. I use Penny´s open collectors outputs to control its six 
bandfilters and PTT input. However, it does not include the 6 m band.
vy 73 es gl de
SM6OMH  Willi

----- Original Message ----- 
From: "Neal Campbell" <nealk3nc at gmail.com>
To: "Willi Reppel" <wi.re at telia.com>
Cc: <n3ick at cox.net>; "Joe Martin K5SO" <k5so at valornet.com>; 
<hpsdr at hpsdr.org>
Sent: Monday, April 27, 2009 10:50 PM
Subject: Re: [hpsdr] Penelope Minimum Power

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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