Re: [softrock40] Re: Configuring SR RXTX6.2 15/17M for 17/20M instead - suggestion?
- At 01:46 PM 12/2/2007, you wrote:
> > Looking for suggestion - I'd like to build 15/17M SR RXTX6.2 for useI would invite you to create a blog on my site and document your
>on 17/20M instead, to complement the SR RXTX6.1 I built for 30/40M
>(goal is these two boards in a box with Si570 oscillator).
>I thought about it but went with the 40/80M, 20/30M, and 17/15M kits
>instead. I am also planning on getting the 12/10M when it is
>available. What I have done is to box two RXTX units together and
>have relay switching for the audio (out to computer only) and RF coax.
>If you look in the photo section under my call, KF4BQ you can see the
>dual RXTX box (four bands) on the lower left side of my circuit
>The box has single computer inputs/outputs and single RF connector.
>The power switch pick which unit to power and drives the relays for
>switching audio output and RF coax. I didn't switch the audio input
>(from the computer) since the lower impedance and higher drive of the
>audio card can drive two softrock inputs without switching. Keyline
>controls were also paralleled.
>I plan on doing this again to fit the 17/15M and 12/10M kits. Then I
>will have two boxes covering 80-10meters. As shown in the picture
>each of my RXTX daughter boards are mounted 90deg so I can piggyback
>another daughter board giving me 4 freqs/board. I haven't finished
>yet because I'm hoping on using a WB6DHW Si570 board instead of the
>piggybacked boards to drive the crystal inputs instead. You can see
>one on the completed (except waiting for the SI570) boards in the photo.
>I haven't done the filtering changes, but with the freq ratios being
>close I'm sure you could. I did do some filter redesign of my Power
>Mosfet amplifier changing the filter design from 160M, 80M, 40M, 30M,
>20/17M, 15/12/10M grouping to: 160M, 80M, 40M, 30/20M, 17/15M, 12/10M
>groupings. This fit my Softrock RXTX configuration better (just the
>opposite for you). You can read about the details in the files
>section under my call (KF4BQ and HF amp modifications).
>73's Mike Collins KF4BQ
whole experience so others can benefit from it. You can also add pictures in.
< http://www.softrockradio.org/ >
"Blessed are the cracked, for they shall let in the light."