Comparison of SB303 vs. SB300/301??

[Edward Swynar VE3 CUI]

Steve...

The SB-300 does, indeed, have provisions for a grand total of THREE
filters, 2 of which were optional (AM & CW)...

I was wondering: if you REALLY wanted a "...high fidelity" bandpass filter
for AM, why not simply remove any existing AM filter, & replace it with a
jumper wire---in other words, NO IF filter whatsoever...?

Might be a tad TOO broad...still, I wonder if anyone has ever tried this on
their own rig? Might be a cheap & easy alternative to trying to hunt down
that ever-elusive 6-KHz wide AM filter (which I'm sure I, too, have read
about / seen advertised SOMEWHERE!).

~73~ Eddy VE3CUI - VE3XZ



----------
> From: Steve Harrison <ko0u at OS.COM>
> To: HEATH at LISTSERV.TEMPE.GOV
> Subject: Re: Comparison of SB303 vs. SB300/301??
> Date: January 22, 1999 10:06 PM
>
> At 03:56 AM 1/22/99 +0000, I asked:
> >...I'm not certain how the 301 was different [from the SB300]
> >other than the solid-state LMO. And I'm particularly curious whether the
> >SB303 performed as well as the 300/301. Any opinions/observations?
>
> Simply put, I was overwhelmed by the response, at least 15! The consensus
> was that the SB303 was preferred by almost all but several guys due to
> higher sensitivity and a general sense of it being a better receiver
> overall. But there were several folks who warned that their examples
> appeared extraordinarily prone to overload and crossmodulation. On the
> other hand, there were two who specifically stated that they had not
> experienced any such problems.
>
> And I was corrected in several of my beliefs, such as I thought that the
AM
> filter was 6 kHz; instead, it's 3.75 kHz. And I thought that the SB301
had
> a solid-state LMO: almost every respondent said their 301 LMO uses a
tube.
> Most folks also confirmed that all three receivers accept three IF
filters;
> I thought I remembered my SB300 having mounting places for only two: but
> the last time I looked, that was over 20 years ago, so....
>
> Finally, almost everyone with a 303 cautioned me to make certain I got
the
> extender boards for it. A question: is there more than ONE extender board
> for the 303? And, are any common to the SB104(A)??
>
> I'm *still* waiting to hear from the local who has the 303; I'm getting
> more and more anxious every hour now! But at the same time, I wondering
> what to do about the AM filter, because 3.75 kHz isn't going to make much
> difference compared to the 2.7 kHz SSB filter in my application
(high-speed
> (>3,300 WPM) CW meteor scatter). But I'd *swear* that I have seen 6 kHz
> filters advertised hereabouts for the SB receivers, most recently only a
> few weeks ago. Would the former owners please tell me more about what
they
> were, please??
>
> One respondent recommended obtaining a R390 for better AM performance. I
> don't have either the room, nor want the headaches associated with fixing
> or maintaining one of those monsters, thanks anyway! Besides, I'm NOT
going
> to use it in AM mode; I just need wider IF bandwidth in SSB mode than the
> standard 2.7 kHz.
>
> TNX to all for your insights and help! 73, Steve Ko0U/1
> (this close || to asking around for another SB303... any for sale? I'd
> rather do my own fixing-up than have someone else do it; that way, I
become
> more familiar with it more quickly since I'm going to do other mods
anyway)
>
> P.S. I don't recall reading any insights as to the actual difference(s)
> between the 300 and 301, though! If it's not the LMO, what is it??
>
> --- --- --- --- --- --- --- --- --- --- --- --- --- --
> To subscribe: listserv at listserv.tempe.gov
> and in body: subscribe HEATH yourfirstname yourlastname
> To unsubscribe:  listserv at listserv.tempe.gov
> and in body: signoff HEATH
> Archives for HEATH: http://www.tempe.gov/archives
> --- --- --- --- --- --- --- --- --- --- --- --- --- --

--- --- --- --- --- --- --- --- --- --- --- --- --- --
To subscribe: listserv at listserv.tempe.gov
and in body: subscribe HEATH yourfirstname yourlastname
To unsubscribe:  listserv at listserv.tempe.gov
and in body: signoff HEATH
Archives for HEATH: http://www.tempe.gov/archives
--- --- --- --- --- --- --- --- --- --- --- --- --- --