[hpsdr] Adding Penelope to the mix...

[mike]

***** High Performance Software Defined Radio Discussion List *****

Hi,

I am interested in doing some development work in the EER amp area and
if there is a need, a medium power linear amp with emphasis on low IMD.

I am currently working on an offline PWM type modulator intended for EER
and have gotten as far as proving that the PWM controller has the
control loop bandwidth to support a 3 KHz voice channel, and I am
working on the high voltage section.

I am new to this group and its development process though so meanwhile I
am trying to absorb the answers to a million questions by reading the
list and archives and listening to the teamspeak recordings.

When I get up to speed I do hope I can find a way to contribute, all or 
part of something of value to the SDR project.

73

Mike
WO1U


 >
 >
 > Hi Peter,
 >
 > This is  my 'unofficial' reply to your questions!
 > 73’s Phil….VK6APH
 >
 >> > Now that Penelope is almost here, I was wondering if there will be 
some
 >> > guidelines published on how best to utilize her (not "it" !) when 
added
 >> > to an existing mix of Atlas/Janus/Ozy + SDR-1000 + PowerSDR.
 >> >
 >
 > Yes,  I’m hoping  that Joe will be able to do another  great user 
manual with a little input from yours truly.
 >
 >
 >> > I'm hoping I can reconfigure so that I can use Penelope for TX and
 >> > continue to use the SDR-1000 as the basis of RX (and can 
reconfigure as
 >> > needed to revert to using the SDR-1000 for TX when I want to take
 >> > advantage of the 100w PA).
 >
 > That is exactly what I did.  Pull the I&Q lead at the input of your 
SDR1000 and just use Penny to Tx with.
 >
 >> > I'm guessing that tapping into the SDR-1000's 100w PA (and ATU) is not
 >> > currently part of the plan.
 >
 > Quite possible but some surgery will be required.  It looks like 
taping into the RFE board should be possible. If you have the necessary 
skills and experience to do this then you are not going to necessarily 
need instructions.
 >
 >> >
 >> > Are there any plans for (or can anyone suggest) a suitable PA to get
 >> > beyond the 1/2 watt level.  Sounds like a nice construction project.
 >> >
 >
 > Just waiting for a volunteer!  There are a number of suitable routes 
to 100w, the one already suggested looks fine.  With Alex now in final 
Alpha we have all the LPF, SWR and Tx/Rx switching completed which will 
simplify the design of the PA.
 >
 >> > Am I correct in assuming that the EER amplifier that has been 
discussed
 >> > will interface directly to Penelope or will there be an intermediate
 >> > stage required?
 >
 > Again, waiting for a volunteer. I  have built a  160m 50w Class E PA 
in order to check that the required signals from Penelope are correct. 
I’m very impressed as to how stable and docile a Class E PA is as well 
as how tolerant it is of component  tolerances and  high SWRs.    We may 
be able to get to the 100w level directly from Penny but if not 
incorporating a  driver stage would not be a problem.
 >
 >> >
 >> > Maybe these questions are premature - if so that's fine - not in any
 >> > rush here, just wondered what was in the works, etc.
 >> >
 >
 > Not at all – I actually built my  100mW to 100w bomb proof PA some 
years ago for just this eventuality.
 >
 >
 >
 >
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