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May 30, 2009

Comments

Kevin S

I notice that the G8 does NOT mention DSP. The Degen DE1123 has DSP IF filtering, making it one of the most selective portable receivers around. In looking at the two pictures, the LCD screens are different, and so there may have been several changes between the PL-300 and the G8. My guess is that the PL-300 is a much better receiver.

Jeffrey McMahon

So you're saying get the Tecscun import to get the DSP. Thanks for the info.

Paul

If you compare Eton's photo of the G8 and actual ebay photos of the PL-300WT, you will notice that the locations/labels of buttons are different from each other.

This could mean a number of things: a) Eton's photos are from a prototype or are photoshopped; b) minor differences exist in user interface between the two radios but the internals are the same, or c) these are different radios internally, that look somewhat similar to each other.

We have to wait for the G8 to show up to decide. I suspect the radios are actually identical and Eton's marketing/photos are not up to date.

Jeffrey McMahon

Paul, are we sure the G8 has DSP?

Paul

We don't know if the G8 has DSP. I suspect it does, but we have to wait and see. I may shoot off an email to Eton asking them.

Kevin S

I looked at the Grundig web site, and no mention of DSP on the G8 product card. Also, the G8 and PL-300 are not the same size! Per eBay, the PL-300 is 5.3 x 3.3.x 1 inch, while the G8 in 6.6 x 4.1 x 1.1, so quite a bit different.

So, despite the similar appearance, these could really be different radios.

Paul

Kevin,

Again my guess is that the specs/dimensions mentioned on Eton's web site are incorrect.

Jeffrey McMahon

Once the dust settles, I'll do a re-post. Thanks for your info.

Ken K.

I read thru all the comments but so far I don't think anyone has really asnwered Jeff's original question. What exactly is DSP and is it worth getting?

I did look it up in the glossary section of the 2009 Passport to World Band and it says something to the effect that digital circuitry rather than analog is used to perform circuit functions and it seems to imply that this is a good thing to have.

Jeffrey McMahon

Ken, thanks. Now will the G8 have this and what kind of real difference will DSP make? We should have these questions answered in the next few weeks.

Kevin S

In answer to Ken's question, here's my take on DSP. The DSP is presumably in the intermediate frequency (IF) filter part of the receiver where, among other things, you try to isolate the signal of interest from adjacent interference.

Old-style filtering with simple LC circuitry (which is typically what you get on cheap receivers) produces a gentle attenuation/roll-off from the signal of interest, meaning that rejection of adjacent channels (say, rejecting 1280 khz while trying to listen to 1290) is not that good, maybe only 20-30 dB down. Ceramic and other filters (as with the Sony S5W) are even better, and have an even sharper attenuation - the adjacent slopper 10 khz might be 50-60 dB down. However, for a strong local, this will still let quite a bit of slop through from a strong adjacent station.

With DSP filtering, the slope of attenuation can be pretty much infinite, meaning that you can pretty much shut the door on adjacent interference, or to mix metaphors a bit, the attenuation curve looks like falling of a cliff. For instance, to listen to 1290, the filter would let absolutely nothing through outside the range of 1285-1295, allowing both sidebands of the target of interest through, but completely attenuate everything else. It's basically about as good as you can do, and as long as a strong local station doesn't slop too far out of its assigned band, an adjacent channel will be much more readable.

The little Degen DE1123 has DSP, and the selectivity is outstanding. So, if the PL-300WT has DSP (likely included on the "radio-on-a-chip" IC used), plus a reasonable-sized ferrite, it could be a fairly hot DX machine.

Hope this helps - Kevin

Jeffrey McMahon

Kevin, great info. Deserves its own post. Thanks.

Ken K.

Kevin, thanks from me, too. It seems like a good leap forward in small radio technology. Makes the Tecsun PL 300 something I will consider. --Ken

Kevin S

Hi all:

Just posted to the UltralightDX and IRCA boards is a review of the PL-300WT, and it's what many have hoped: excellent sensitivity (considering the size) and other-worldly selectivity from the DSP filtering. This was specifically for the Tecsun, not for the Grundig G8. Gentlemen, start your wallets!

Jeffrey McMahon

Will the G8 be the same? Dang. I don't want to use batteries exclusively.

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