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?
73, 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@hotmail.com ======================================