[hpsdr] Odyssey Siren Design

[Nyall Davies]

HAVE YOU considered the HMC174MS8
I am only observing emails and not taking too close a look at the detail but 
I found some of these on ebay while looking for something else. This is a DC 
to GHz changeover switch made by Hittite with an IP3 typical of 60dBm and 
0.5dB loss, 10nS switching.
It might be irrelevant for various reasons but I thought I would draw your 
attention to it.

Nyall G8IBR

----- Original Message ----- 
From: "Ahti Aintila" <oh2rz.sdr at gmail.com>
To: "Steven Bible" <n7hpr at tapr.org>
Cc: <hpsdr at hpsdr.org>
Sent: Thursday, September 28, 2006 5:44 AM
Subject: Re: [hpsdr] Odyssey Siren Design


> ***** High Performance Software Defined Radio Discussion List *****
>
> Steve,
>
> Now that you found the SN74LVC2G53 for me, I'm going to change over to
> that device. You just go ahead with this concept. It looks to me a
> very good compromise regarding the low power requirements.
>
> By the way, you may consider using Vcom reference voltage from the
> AK5394A for biasing the switch and the opamp.
>
> 73, Ahti OH2RZ
>
>
> On 28/09/06, Steven Bible <n7hpr at tapr.org> wrote:
>> ***** High Performance Software Defined Radio Discussion List *****
>>
>> Hello Ahti,
>>
>> Thank you very much.  You've given me more to think about.
>>
>> 1. In some more research today, I think the only other fully differential
>> opamp that comes close to the noise figure of the OPA1632 is the THS413x.
>> However, it costs almost $2.00 more than the OPA1632.  The OPA1632 can go
>> lower in supply voltage (+/-2.5V) whereas the THS413x is 5V (advantage
>> OPA1632).
>>
>> 2. and 3. Now I get it.  To get the sampling pulses you need, there is no
>> other part.  Not even a combined part.  All the combined swithes that I
>> found the clocking is common to all the switches, and that won't work for
>> your circuit.
>>
>> Finally, I'll try to use the SN74LVC2G53.  But I could also simply run 
>> the
>> SN74AUC2G53 at 2.7V.  It is only another regulator.  Your thoughts?
>>
>> I think I have enough information now, I'll continue drawing the 
>> schematic
>> and post it to the list soon.
>>
>> 73,
>>
>> - Steve, N7HPR
>>  (n7hpr at tapr.org)
>>
>>
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