Re: mono band 2 meters rig based on the micro BITx circuit #ubitx #2meters

Lawrence Galea

I have one for 6M and another for 4M.
Very small and easily fitted in a case with the μbits.
If you want higher power that's another issue.
With just the barefoot transverter and a simple dipole just about 4M high on the roof fed with some 15M RG58 I worked quite a few stations on 4M as can be seen on my 4M loq at 

On Sat, Apr 28, 2018 at 5:06 PM, K9HZ <bill@...> wrote:

If such a radio is just CW and SSB, those ultra-cheap transverters from the Ukraine are by far the best solution.  If the radio will operate FM… that’s where a redesign is required.


I’m using one of the transverters now and they work fine with some simple interfacing.



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From: [] On Behalf Of Jerry Gaffke via Groups.Io
Sent: Saturday, April 28, 2018 9:58 AM
Subject: Re: [BITX20] mono band 2 meters rig based on the micro BITx circuit #ubitx #2meters


Looks like the goal is to build something more challenging than the uBitx.
Beyond that what it is or does is totally up in the air.
Discussion seems to be moving toward a single band rig capable of SSB/CW about uBitx size.

A few thoughts of my own:
Phase noise from that si5351 gets worse as the freq goes up, maybe an si5338 or si5341?
Having all oscillators off a single reference makes calibration much easier.
Could be used for cross band ops if it receives on more bands than it transmits.
A wideband receiver could also be a spectrum analyzer, use digital techniques
on the audio when resolution better than the crystal filters is required.
Transmit mixer, drivers, final could be a separate board for each band desired,
zero transmit boards is an option for receive only.


On Sat, Apr 28, 2018 at 05:55 am, Tim Gorman wrote:

I'm lost as to what your goal is here.
1. The baofeng won't do SSB. Are you wanting to build a SSB unit or an
FM unit?
2. Are you thinking of a handheld or a desktop?
3. a phase line at 432Mhz won't be correct for 144Mhz. Are you thinking
a two-band unit or one-band unit?


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