[hpsdr] Odyssey Siren Design

[Nyall Davies]

I am simply working from the Hiitite data sheet at present. It says 10nS 
rise and fall times  10 to 90% RF - delay 24 nS 50% clock to  10, 90% RF 
out.

Yes I know that they need C in the I/P O/P but it is a lot simpler than 
playing with pot. chains and an FST3125.

Thanks for the info - I will have a play when the present project allows.

Nyall G8IBR

----- Original Message ----- 
From: "Ahti Aintila" <oh2rz.sdr at gmail.com>
To: "Nyall Davies" <nyalldavies at ukonline.co.uk>
Cc: "Steven Bible" <n7hpr at tapr.org>; <hpsdr at hpsdr.org>
Sent: Thursday, September 28, 2006 12:21 PM
Subject: Re: [hpsdr] Odyssey Siren Design


> Hi Nyall,
>
> HMC174MS8 is obsoleted, the replacement is HMC574MS8. Those are
> otherwise very interesting devices, but according to my understanding,
> the specified rise and fall times are typically 80 ns that is too slow
> for sampling purpose. We are looking for swithches preferably better
> than 10 times faster for lower switching losses at high clocking
> (sampling) speeds. Hittite switches are made for TX/RX changeover
> applications.
>
> BTW, where did you see the 10 ns specification?
>
> 73, Ahti OH2RZ
>
> On 28/09/06, Nyall Davies <nyalldavies at ukonline.co.uk> wrote:
>> 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
>>
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