[hpsdr] Penelope Minimum Power

[n3ick at cox.net]

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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