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Old June 26th 08, 08:55 PM posted to rec.radio.amateur.homebrew
[email protected] john@feith.com is offline
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First recorded activity by RadioBanter: Jan 2007
Posts: 27
Default Group Delay Variation - How much is too much?

On Jun 26, 2:40*pm, Tim Shoppa wrote:
But even at 20 microseconds I don't think any of the HF digital modes you
mentioned would be impacted.


Thanks ... that's the type of information I was curious about.

Wow, a HF receiver with a 500kHz SAW filter after the mixer. I don't
have a clue what you're doing!


I'm "playing" with something resembling 0 - 175 Mhz up converted to
208 Mhz
filtered using a GSM SAW filter sampled at the first IF using a 25
Msps 16 bit
ADC. The silly width is because I'm interested in handling broadcast
FM
including RDS (among other things). I'm also interested in receiving
satellite
images which in some cases has a bandwidth of 150 Khz.

-- John