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Re: Multiband bitx G6LBQ links

 

What is it about the G6LBQ that makes it inherently more “multiband” than the BitX-40 v3? Architecturally, it looks very similar, and has an opaque “multi-band band pass filter” block on the diagram that really doesn’t provide any insight.

My (naive?) thought to make my BitX multiband was to use QRP-Labs LPF and BPF modules, on two of the relay switching boards. Swap out the LPF and BPF, and signal to the Raduino somehow which band is selected to adjust the VFO accordingly.

Is there any more than that? My hope is to get 80, 40, and 20m out of it at least, maybe 15m or 10m if the circuit can handle a 33MHz or 40MHz VFO.

-Mark

On Oct 27, 2017, at 5:29 PM, pierre@... wrote:

Hi,

Re: the G6LBQ Bitx design. If you haven't found it (a link) already have a look here:



and here:



it seems some of the hams in YB land have taken an interest in the G6LBQ version of the Bitx.

Note: the gain distribution in the G6LBQ version is different to the standard Bitx design, it uses an MC1350 IF amp chip in the IF after the xtal filter, more gain (an extra 35 - 40dB) in the IF and an easy access to IF AGC using this chip. I guess the audio gain has been reduced to compensate for the extra gain in the IF.

I believe this version of the Bitx is no longer available but the circuit is still around on the net if you look for it.

Regards,

Pierre VK1XP



On 28-10-2017 08:44, Smitty, KR6ZY wrote:
Link?
On Oct 27, 2017, at 1:06 PM, alphaindia4oscartango via Groups.Io <alphaindia4oscartango@...> wrote:
What about the G6LBQ multiband bitx? That design looks pretty cool. The bandchanging looks really efficient.
73 de Chas ai4ot
Sent from my iPhone
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