[hpsdr] Possible 5 band VHF transverter?

[Phil Harman]

Hi Conrad,

You may like to consider the MAX2870 integrated VCO/Synth.  I've been 
evaluating one for the Cyclops Spectrum Analyser project and the phase noise 
is quite good in comparison to other devices.

73 Phil....VK6APH



-----Original Message----- 
From: Conrad Farlow
Sent: Thursday, March 14, 2013 11:34 AM
To: hpsdr at openhpsdr.org
Subject: Re: [hpsdr] Possible 5 band VHF transverter?

***** High Performance Software Defined Radio Discussion List *****

I am working on a multiband transverter for Hermes, its early days but I
have narrowed down my choices of Silicon. It will be possible to lock to
either the 122.88 MHz Hermes oscillator or a 10 MHz ext source . It's a
synth but the phase noise is very reasonable for an integrated VCO/Synth
based design .

I had forgot about 220 MHz but there is no reason why it could not be
accommodated.

I hope that the transverter will work up to 13cms and down to 4M.

TX Output will be of the order of 23 dBm with some 10W amplifiers to
come later. This seems to be a sensible output power given the drive
requirements of a modern LDMOS devices.

I still have a LOT to sort out but so far I am very encouraged that I
can make this happen and that the transverter will be better than older
designs and will use modern devices that should have a long shelf life.

I will post some performance figures as I develop the boards, I expect
that it will take me 6 months or so to complete with my current workload.

73

Conrad G0RUZ



> ***** High Performance Software Defined Radio Discussion List *****
>
> This chip has been around for a couple of years, but this board might make 
> a nice transverter for Hermes.  6 dBm out.  Too bad it won't reach down to 
> 2M and 220.
>
> http://myriadrf.org/
>
> The Kickstarter Blade project would be more in line with this board, but 
> only has a 12 bit receiver.
>
> N0UU
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