New subject: SMALL VHF TRANSCEIVERS

23 Feb 2015

Alberto,

Thank you for the response and asking the software developer the question:

Ø   I asked the software developer of the FDM-SW2 program about your
question.

Ø  He said that the demodulated outputs of the channels corresponding to the
two IF frequencies that you would feed combined into the DUO,

Ø  presently can be combined into VAC, but either at 48 or 192 kHz, not 96,
as a final sampling frequency...

Ø  but he said also that if this is a requirements, it would not be too
complicated to add the 96 kHz capability...

I am not sure if we have got something wrong in the wording or translation
of my question. The output required to drive Joes MAP65 software is not
demodulated but two separate streams of 96KHz sample rate I & Q. These I
hope to produce from two different, but locked, IF channels from the H and V
signals from my 144MHz X-pol array.

To overcome the need for two A/D converters, ie ANAN 200D or two separate
locked receivers, I would like to use two different frequency IFs.  Both
being locked to a 10MHz reference, filtered and combined in order to drive a
single receiver A/D converter and recover both I&Q for both IFs in software.
I already have a pair of G4DDK 144MHz transverters driven by a G4HUP locked
116MHz source. I have been testing a scheme whereby I filter both 28MHz Ifs
and mix one down to 18MHz using the 10MHz reference.

It should be possible to perform basic functionality tests for such a scheme
without VHF transverters. If one receiver is set on 14MHz and the other on
21MHz it should be possible to use MAP65 software simultaneous decoding HF
JT65 transmissions from each band but displayed as pure H or V
polarisations.

I hope that makes my question a little clearer.

73

John G4SWX

Date: Mon, 23 Feb 2015 10:47:43 +0100

From: Alberto di Bene &lt;dibene(a)usa.net&gt;

Subject: Re: [Moon-Net] SMALL VHF TRANSCEIVERS

To: moon-net(a)mailman.pe1itr.com

Message-ID: &lt;54EAF73F.9060008(a)usa.net&gt;

Content-Type: text/plain; charset="windows-1252"

On 2/22/2015 9:45 PM, John Regnault wrote:

...
  /After having read the attractive spec of this
transceiver this raises  
...
  a fairly complex question:/ /The Elad Duo can be run
in a dual  
...
  receiver mode. I am unsure as whether this transceiver
in its dual  
...
  receiver mode could be fed simultaneously directly
into MAP65 at  
...
  96KSPS rate per channel./ /  / /If that is the case
and I fed the  
...
  receiver with 2 frequency independent, but locked
transverter IFs  
...
  corresponding to V and H polarisations(I can solve
that part) I would  
...
  have a flexible transceiver with a MAP65 capability./

John,

    I asked the software developer of the FDM-SW2 program about your
question.

He said that the demodulated outputs of the channels corresponding to the
two IF frequencies that you would feed combined into the DUO, presently can
be combined into VAC, but either at 48 or 192 kHz, not 96, as a final
sampling frequency...

but he said also that if this is a requirements, it would not be too
complicated to add the 96 kHz capability...

I will contact him again in a few days to know if/when that modification
will be done.

73  Alberto  I2PHD