[amsat-bb] Re: Flex-5000
kl7uw at acsalaska.net
Fri Apr 6 13:00:12 PDT 2007
At 11:19 AM 4/6/2007, Robert McGwier wrote:
>Edward Cole wrote:
>>I had a look a the info on the Flex Radio website. I'd be
>>interested in more information when its available: interior photos
>>and block diagram. For satellite use, hopefully freq offset
>>separation between RX and TX LO's is possible. If it is, then
>>satellite tracking software may be written for the radio. Couple
>>that with appropriate xvtrs and this will make a great satellite radio.
>Completely, totally separates in the same box. It will share the
>same antenna or not. It will use the 0 dBm port in simplex or
>duplex mode for transmit transverter. You can set up the transverter
>port to be full duplex and run the transmit and receive converters
>simultaneously through the separate IF's. You should have heard me
>howl when this was messed up on the first alpha model. ;-).
>>I'm playing with the SDR-IQ joined to a DEMI 144/28 xvtr for
>>experimenting on eme with JT65. Having the direct USB connection
>>is a great work around the slower sound-cards. Assuming the 5000
>>does the same to get 190-KHz span.
>Firewire. This allows ONE cable for control and isochronous
>sampling for the transmitter and the two receivers. The IF is
>delivered isochronously to the operating system where the DSP does
>all demod,mod, and detection. 192 kHz is chosen because the radio
>uses standard sound card rates to get it into the operating system easily.
>Firewire was designed for this kind of operation with isochronous
>sampling and asynchronous tranmission for control. It works well
>enough to deliver QSK operation.
>>For full use of Linrad, dual Rx channels are needed where the two
>>Rx are slaved to the same LO for preservation of phase. I'm
>>wondering if this is possible with the new radio with the extra Rx?
>ALL oscillators are derived from the same sources where they need to
>be. You will be have all LO's be in phase. I cannot wait to do
>polarization diversity at Al Katz house with this radio.
Wow! What can one say, but --- Cool. This might be my next radio?
Ed - KL7UW
BP40IQ 50-MHz - 10-GHz www.kl7uw.com
144-EME: FT-847, mgf-1801, 4x-xpol-20, 185w
DUBUS Magazine USA Rep dubususa at hotmail.com
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