[ICOM] 751 v. 751A

Frank A. Ellis w3uhf at yahoo.com
Mon May 31 11:23:41 EDT 2004


Hi,

Not exactly. The IC-751A pre-dated the IC-761 so it is
not a 761 "stuffed into a 751 case". Quite the
opposite is true, however. The IC-761 is basically an
IC-751A stuffed into a larger case along with all the
options available for the IC-751A included in that
larger case. The Main Unit from the IC-751A was made
larger in the front to accomodate an extra filter set
and the included antenna tuner in the IC-761 was
basically an AT-100/AT-150 type mechanism without a
case, fitted into the IC-761 case. The optional UX-14
Computer Interface offered in the IC-751A was added in
the IC-761 as standard, and was known as the "Logic
Unit A" in the IC-761. The PS-35 Internal power supply
which was optional in the IC-751A was included as
standard in the IC-761. 

The IC-751A was subject to many design improvements
over the original IC-751, the largest of which was an
architectural redesign the IF chain and improvements
to the receiver. The IC-751 only had one 9 MHz IF (the
2nd IF) while the IC-751A had two 9 MHz IF's, the 2nd
and 4th. the 3rd IF is 455 KHz in both radios.

The IC-751 was (is) an excellent performer which was
incrementally improved by the introduction of the
IC-751A. The IC-761 offered no real performance
improvements over the IC-751A, just all the options
included, more filter positions available, and a
"large desktop" case like the IC-765. 

The IC-765 was the first major re-design after the
IC-751/751A/761 family with the addition of DDS
frequency synthesis, among other major differences.

73, Frank W3UHF


--- Bruce Marton <bmarton at maine.rr.com> wrote:
> They are not the same rigs at all.  The 751A is a
> 761 stuffed into the
> 751 case.  As I have been told, the main board is
> that of the 761.  I
> have owned both of the 751/751A rigs and there are
> many updates involved
> with the A model, however my 751 was an excellent
> performer, don't
> discount it as a good rig.
> 73, Bruce K1XR
> 
> 
> -----Original Message-----
> From: icom-bounces at mailman.qth.net
> [mailto:icom-bounces at mailman.qth.net]
> On Behalf Of ADUHAWK at aol.com
> Sent: Monday, May 31, 2004 10:50 AM
> To: icom at mailman.qth.net
> Subject: [ICOM] 751 v. 751A
> 
> I had a friend who owned both radios.  Another
> difference between them 
> involved bandswitching.  As he described it, if you
> were to go from 40
> meters to 20 
> meters the frequency went to 14.000, not to the last
> frequency you were
> on 20.
> 
> As I recall, he spoke mostly about convenience items
> between the radios.
> 73, 
> Tim K0PG
> ----
> Your Moderator: Dick Flanagan K7VC,
> icom-owner at mailman.qth.net
> Icom Users Net: Sundays, 1700Z, 14.316 MHz
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> 
> ----
> Your Moderator: Dick Flanagan K7VC,
> icom-owner at mailman.qth.net
> Icom Users Net: Sundays, 1700Z, 14.316 MHz
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