[hpsdr] Penelope Minimum Power

[Neal Campbell]

Great its another option to consider! Also thanks to Willi for his
further comments!

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 10:29 PM,  <n3ick at cox.net> wrote:
>
> Neal,
>      I am using a PA from an FT-890 it has been pretty easy to get set up I am not familiar with the PA from the 735.
> 73's
>
> ---- Neal Campbell <nealk3nc at gmail.com> wrote:
>> 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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