[Premium-Rx] Racal 1772/78 receivers

[Thomas Adams]

No good.

Last IF is 1400 KHz.


At 21:06 10-08-10, Williams, Barry wrote:
>If the Racal has a 455 KHz I.F. Stage Kiwa makes 
>some very good filters that can be spliced 
>anywhere in that stage.  I have a 6 KHz and a 15 
>KHz used to sharpen I.F. Stages in older 
>receivers (National HRO).  You might also try 
>tuning off the receive frequency a KHz or 2 to 
>one side or the other for more high frequency recovery in the audio.
>
>I use R-390A and SP-600 with synch detector from Sherwood.
>
>73,
>Barry,
>KD5VC
>------Original Message------
>From: Master Lee
>To: Thomas Adams
>Cc: premium-rx at mailman.qth.net
>Subject: Re: [Premium-Rx] Racal 1772/78 receivers
>Sent: Aug 10, 2010 9:35 PM
>
>Please explain as your statement is some what  lacking in detail
>
>73 Lee
>----- Original Message -----
>From: "Thomas Adams" <quixote2 at ix.netcom.com>
>To: "Enrique Fernandez García" <enriqueeeeee2001 at yahoo.es>;
><premium-rx at mailman.qth.net>
>Sent: Wednesday, August 11, 2010 8:38 AM
>Subject: Re: [Premium-Rx] Racal 1772/78 receivers
>
>
> > BTW...   re the WJ 8718;
> >
> > My shack also contains the AN/URR-74 (V) 2, the military version of the
> > 8718.
> >
> > For BCB DXing, the RA01772 beats it by a country mile.
> >
> >
> > Mr. T.  W9LBB
> >
> >
> >
> > At 13:36 10-08-10, Enrique Fernandez García wrote:
> >>
> >>
> >>I purchased a 'non standard' unit,came from RAF,
> >>with these filters fitted 0,4, 1,24, 2,7 and 8
> >>Khz has the ISB option fitted with AFC.
> >>
> >>  It affects mainly the mode and bandwidth
> >> features.  Later I did some modifications on
> >> the USB and mode swiches in order to have a
> >> 'standard' set.  I removed the 0,1 Khz filter,
> >> some wire links need to be changed, and added a
> >> 6,8 Khz filter instead. ( Thanks Dan for your help ! ).
> >>
> >>    The difference in listening with the 6,8 and
> >> the 8Khz filters it is noticeable but for my
> >> taste and use I would need something more narrower.
> >>
> >>Mainly I use it for AM BCB Dxing on tropical
> >>bands but when I need to identify a weak station
> >>I use the LSB filter with fair results.
> >>
> >>My only complain it is that when I try to listen
> >>a faint signal it is quite difficult to
> >>understand the ID or the speech, audio it is too
> >>bassy and it would need a better audio recovery
> >>so I will try the ELPAF audiofilter.
> >>Quite sure that a better headphones would mark a
> >>difference but I have still not found the
> >>perfect match.  I tried the Japan Radio Company
> >>ST-3 but no significant improvement.
> >>Another good option would be to install a 600: 8
> >>audio transformer and listening with 8 Ohms headphones.
> >>
> >>Now, I am thinking about to get a 1778 , but I
> >>do not know if I really need it or with the 1772 it is enough.
> >>On latter posts somebody asked for the WJ 8718A
> >>receivers , they are again for sale at a fair price.
> >>
> >>
> >>http://cgi.ebay.com/Watkins-Johnson-WJ-8718A-H 
> F-shortwave-receiver-/180532736925?pt=LH_DefaultDomain_0
> >>
> >>
> >>
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> >
> >
>
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