i'm glad you found that moleculo. i had been trying to find the link so i could post it here. but i had been running into dead ends as i couldn't remember where i had seen this page and couldn't find it again.
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best radio for receive on ssb
- Thread starter doctor
- Start date
the reason the htx-100 has a the narrower i.f. filter (3khz) is because it has no a.m. the 2510 has a 5khz filter because it has a.m. if you pass a 6khz wide a.m. signal through a 3khz filter, it is going to sound like crap. uniden could have used separate ssb and a.m. chains with filters in each chain (3khz for ssb and 5-6khz for a.m.), but then they would have to pass this cost on to the consumer.
this is exactly what cobra/uniden did with the 148gtl (used individual fitlers for a.m. and ssb). and to go a step further, they used a 6 pole crystal filter in the ssb chain which narrowed the passband down to about 2.1-2.4khz.
even the newer uniden clones (rci, galaxy, etc) use a separate filter for ssb that is about 2.5-3khz wide. this is about the same bandwidth as for the htx-100.
a radio being multi-banded has nothing to do with its selectivity. it is mainly in the design of the i.f. circuits as demonstrated by the htx100 and 2510 comparison.
this is exactly what cobra/uniden did with the 148gtl (used individual fitlers for a.m. and ssb). and to go a step further, they used a 6 pole crystal filter in the ssb chain which narrowed the passband down to about 2.1-2.4khz.
even the newer uniden clones (rci, galaxy, etc) use a separate filter for ssb that is about 2.5-3khz wide. this is about the same bandwidth as for the htx-100.
a radio being multi-banded has nothing to do with its selectivity. it is mainly in the design of the i.f. circuits as demonstrated by the htx100 and 2510 comparison.
freecell said:
I see, very informative...the Y-axis is the output voltage of the AGC rectifier. Kind of what you would expect I guess.
The 148 was an 89 Filapina, and I think there is a sensitivity specification published by Uniden, something to the effect of 0.15 uV for 20 dB SINAD or S+N/N, whatever it is. But I still like to revert to actual performance figures.
Which are relavant in this case, no?
hr2600/hr2510/lincoln/2950
exports
unidengrant/cobra148/presidentgrant,washington,madison
cb type
this is what ive found in the last 15yrs of talking on cb
exports
unidengrant/cobra148/presidentgrant,washington,madison
cb type
this is what ive found in the last 15yrs of talking on cb
