WTB slicer or ssb adapter
David Thompson
condition. Might consider an ssb adapter such as the Hammarlund HC-10 if it
has the
conncting cables.
Condition and price is an e-mail directly to me at thom...@mindspring.com
73 Dave K4JRB
Scott Dorsey
>Looking for a central electronics or similar slicer in at least restorable
>condition. Might consider an ssb adapter such as the Hammarlund HC-10 if it
>has the
>conncting cables.
Would you consider a solid-state one? I am looking at doing a design for
one right now, which would work with any receiver with a 455 KC IF.
--scott
--
"C'est un Nagra. C'est suisse, et tres, tres precis."
Richard Knoppow
"Scott Dorsey" <klu...@panix.com> wrote in message
news:g0i38q$ei7$1...@panix2.panix.com...
> David Thompson <thom...@mindspring.com> wrote:
>>Looking for a central electronics or similar slicer in at
>>least restorable
>>condition. Might consider an ssb adapter such as the
>>Hammarlund HC-10 if it
>>has the
>>conncting cables.
>
> Would you consider a solid-state one? I am looking at
> doing a design for
> one right now, which would work with any receiver with a
> 455 KC IF.
> --scott
>
design one that is superior to the old vacuum tube models.
There are certainly plenty of receivers out there which
could use an adaptor. Have you any definite ideas about
price range, features, etc?
--
---
Richard Knoppow
Los Angeles, CA, USA
dick...@ix.netcom.com
Scott Dorsey
> It seems to me that it should not be too difficult to
>design one that is superior to the old vacuum tube models.
>There are certainly plenty of receivers out there which
>could use an adaptor. Have you any definite ideas about
>price range, features, etc?
What I was thinking was to take the AM synchronous detector circuit from
OH2GF which was published in the July '93 QST issue. It is based on an
NE602 which does not have the best dynamic range in the world but seems to
be okay.
I was first going to make up a PC board layout rather than constructing it
dead-bug style like the original, then I was going to try one of the new
Maxim detector chips in place of the NE602, but retaining the NE804 limiter
and phase detector.
If I were going to do it with tubes, I would look into some of the sheet
beam tubes that were intended for TV chroma detector circuits... many of
them have excellent performance and are very inexpensive (as are all old
TV tubes). The 7360 costs a bloody fortune when you can find one, but
the 6AR8, 6JM8, and 6ME8 are effectively the same basic design but with
less crosstalk.
David Thompson
Ebay for the little solid state receivers ($40 or so). Just need to get one
to match the 455 IF as I am betting the little Chinese RX has an odd ball IF
probably 30 mhz or higher!
Dave K4JRB
Michael Black
> Richard Knoppow <dick...@ix.netcom.com> wrote:
>> It seems to me that it should not be too difficult to
>> design one that is superior to the old vacuum tube models.
>> There are certainly plenty of receivers out there which
>> could use an adaptor. Have you any definite ideas about
>> price range, features, etc?
>
> What I was thinking was to take the AM synchronous detector circuit from
> OH2GF which was published in the July '93 QST issue. It is based on an
> NE602 which does not have the best dynamic range in the world but seems to
> be okay.
>
A slicer by definition has selectible sideband, and maybe specifically
uses phasing to get it.
They existed at a time when there wasn't much but AM radios, so to get
around the "turn down the RF gain, turn up the AF gain and turn on the
BFO" you needed to add a product detector. Once you were doing that,
you might as well add selectable sideband via phasing, since it didn't
add that much to the cost, but did help improve things when the receiver's
IF was wide for AM.
It lives on today, since most "low end" shortwave receivers that have
synchronous detector uses the phasing method to increse performance
without the cost of an actual better IF filter.
There were external SSB adaptors that included an IF filter for SSB,
but I can't think of seeing any that called themselves "slicers".
Michael VE2BVW
Richard Knoppow
"Michael Black" <et...@ncf.ca> wrote in message
news:Pine.LNX.4.64.08...@darkstar.example.org...
suppressed carrier SSB but my understanding of it may be
incorrect. To me a synchronous detector is a device for
replacing the carrier of a double sideband signal, either AM
or suppressed carrier and synchronized by means of the equal
and opposite phase of the two sidebands. Such a detector
will supply a locally generated carrier which has exactly
the right phase with relation to the sidebands even when
they are distorted by selective fading. Similar detectors
are also used for television where there is a residual
carrier and sideband since that is enough to lock the
oscillator to the correct frequency and phase.
Beam switching tubes were used to some extent in
commercial vacuum tube equipment but Hallicrafters
transmitters are the only example with come to mind at the
moment, I am sure there were others. These things came along
at about the same time that transistors began to supplant
tubes.
As far as selectable sideband in an SSB adaptor AFAIK
all worked by means of either shifting the signal to the
filter frequency or having two filters. I don't see how
phasing would work in a receiving adaptor. There were
numerous phasing type SSB generator for transmitting, for
instance the one made by Barker and Williamson who also made
90degree audio phase shifting networks for use in home made
ones. I still have the B&W adaptor I used in the 1960s. It
worked pretty well but had to be adjusted for any large
frequency change. Stable high performance filters or
reasonable cost pretty much ended the use of phasing type
exciters.
In any case, a good performing receiving adaptor which
would work on older receivers, especially tube receivers,
would be welcome. The old Hammarlund and TMC units are
pretty hard to come by and, I suspect, something modern
would outperform them.
--
---
Richard Knoppow
Los Angeles, CA, USA
dick...@ix.netcom.com
WB6KBL
Tio Pedro
"Richard Knoppow" <dick...@ix.netcom.com> wrote in message
news:qP2dnZ4N0OEl0rLV...@earthlink.com...
> > As far as selectable sideband in an SSB adaptor AFAIK all worked by
> means of either shifting the signal to the filter frequency or having two
> filters. I don't see how phasing would work in a receiving adaptor. There
> were numerous phasing type SSB generator for transmitting, for instance
> the one made by Barker and Williamson who also made 90degree audio phase
> shifting networks for use in home made ones. I still have the B&W adaptor
> I used in the 1960s. It worked pretty well but had to be adjusted for any
> large frequency change. Stable high performance filters or reasonable cost
> pretty much ended the use of phasing type exciters.
>
> In any case, a good performing receiving adaptor which would work on
> older receivers, especially tube receivers, would be welcome. The old
> Hammarlund and TMC units are pretty hard to come by and, I suspect,
> something modern would outperform them.
>
>
> --
> ---
> Richard Knoppow
> Los Angeles, CA, USA
> dick...@ix.netcom.com
> WB6KBL
>
The Central Electronic Sideband Slicer used phasing for SSB reception.
On the other hand, the B&W 370 used the filter method.
Pete
Richard Knoppow
"Tio Pedro" <radioco...@cox.net> wrote in message
news:FGJXj.3998$D21....@newsfe20.lga...
a look at what they are doing.
Edward Knobloch
> I found the handbook for the CE box on BAMA and will have
> a look at what they are doing.
>
Hi,
The Central Electronics Slicer was based on the GE Signal Slicer,
which appeared in GE Ham News, July-Aug 1951.
BANA has the issue, under the category gehamnews, filename ge0604.pdf
The GE article shows how to build it, including the the 90 degree
audio phase shift network. It's pretty slick -
a selectable sideband adapter based on a phase shifting circuit,
for any 450kc to 500kc i.f. receiver.
73,
Ed Knobloch
David Thompson
A slicer allows one to copy and select the sideband
on an older receiver such as the Hammarlund 129X.
The most prominent slicer was amde by Central Electronics there were two
versions, one just a slicer and another with a Q Multiplier which was
usually missing from older receivers. There were several other slicers on
the market. I had one called a VR
made in New England. RME made one to match the 4300/4350 receivers. This
was the only one that did not match 455 kcs IF's.
The best example of the ssb adapter was the Hammarlund HC-10 which added
another IF plus a slot and pass band filter. The SPC-10 was exactly the
same except sold to the DOD for six times as much as the HC-10. Frank
Lester (SK) designed these and helped incorporate them into several of the
Hammarlund receivers. TMC and several others made ssb adapters, too.
Both the slicer and SSB adapters made copying CW better too.
Dave K4JRB and still looking!
Tio Pedro
"David Thompson" <thom...@mindspring.com> wrote in message
news:142dnbcnz-a5nK7V...@earthlink.com...
The B&W 370 includes a SSB crystal filter.
Fireb...@gmail.com
Those radios have a 455 if output to connect to that adapter.
COLIN LAMB
taken the output after the 455 kc conversion.
73, Colin K7FM
Scott Dorsey
<Fireb...@gmail.com> wrote:
>On May 16, 3:18=A0pm, "David Thompson" <thomp...@mindspring.com> wrote:
>> Sure a solid state one would be OK. =A0There is a solid state SSB adapter =
>on
>> Ebay for the little solid state receivers ($40 or so). =A0Just need to get=
> one
>> to match the 455 IF as I am betting the little Chinese RX has an odd ball =
>IF
>> probably 30 mhz or higher!
>> Dave K4JRB
>
>Those radios have a 455 if output to connect to that adapter.
What is this adaptor and this radio? Anybody got an actual name?
Richard Knoppow
"Edward Knobloch" <al...@nowhere.net> wrote in message
news:KmoYj.505$ju1.354@trndny06...
I have the full set of GE Ham News from the web so I'll
look for it. One of the patents is from R.B.Dome and was one
of those for the Dome stereo system for FM.
Richard Knoppow
I printed this out. The GE treatment is much more
informative than the CE handbook and the schematic is drawn
in a less confusing way.
This issue of GE Ham News does not have details of the
90degree network, it refers to an earlier edition which has
an artical on building a phasing type transmitting SSB
generator. That one does not appear to be on-line, at least
not on the BAMA site.
Its interesting to me that General Electric was hep to
SSB for ham use in about 1950 when it was still quite a
novelty. Of course SSB goes back into the 1930's for
commercial purposes, maybe even earlier. I don't remember
when AT&T began to use it for their transoceanic telephone
service.
Fireb...@gmail.com
> In article <8f952fd3-d8a5-47e6-9c17-67cc296c9...@u36g2000prf.googlegroups.com>,
>
> <Firebott...@gmail.com> wrote:
> >On May 16, 3:18=A0pm, "David Thompson" <thomp...@mindspring.com> wrote:
> >> Sure a solid state one would be OK. =A0There is a solid state SSB adapter =
> >on
> >> Ebay for the little solid state receivers ($40 or so). =A0Just need to get=
> > one
> >> to match the 455 IF as I am betting the little Chinese RX has an odd ball =
> >IF
> >> probably 30 mhz or higher!
> >> Dave K4JRB
>
> >Those radios have a 455 if output to connect to that adapter.
>
> What is this adaptor and this radio? Anybody got an actual name?
> --scott
> --
> "C'est un Nagra. C'est suisse, et tres, tres precis."
E-Bay Item # 140138471416
k3hvg
> E-Bay Item # 140138471416
>
>
Given the array of components, looks like a simple crystal controlled
BFO, not a product detector? Any idea of what the IF is?
Fireb...@gmail.com
455 KC
Scott Dorsey
>On May 21, 8:01 am, klu...@panix.com (Scott Dorsey) wrote:
>> In article <8f952fd3-d8a5-47e6-9c17-67cc296c9...@u36g2000prf.googlegroups.com>,
>>
>> <Firebott...@gmail.com> wrote:
>> >On May 16, 3:18=A0pm, "David Thompson" <thomp...@mindspring.com> wrote:
>> >> Sure a solid state one would be OK. =A0There is a solid state SSB adapter =
>> >on
>> >> Ebay for the little solid state receivers ($40 or so). =A0Just need to get=
>> > one
>> >> to match the 455 IF as I am betting the little Chinese RX has an odd ball =
>> >IF
>> >> probably 30 mhz or higher!
>> >> Dave K4JRB
>>
>> >Those radios have a 455 if output to connect to that adapter.
>>
>> What is this adaptor and this radio? Anybody got an actual name?
>
This just looks like a simple BFO... I do not see any filter or detector
here. Useful enough, but not so high-performance.
Tio Pedro
"Richard Knoppow" <dick...@ix.netcom.com> wrote in message
news:qP2dnZ4N0OEl0rLV...@earthlink.com...
> all worked by means of either shifting the signal to the filter frequency
> or having two filters. I don't see how phasing would work in a receiving
> adaptor. There were numerous phasing type SSB generator for transmitting,
> for instance the one made by Barker and Williamson who also made 90degree
> audio phase shifting networks for use in home made ones. I still have the
> B&W adaptor I used in the 1960s. It worked pretty well but had to be
> adjusted for any large frequency change. Stable high performance filters
> or reasonable cost pretty much ended the use of phasing type exciters.
entire phasing using passive components. (I suppose it is,
but it would have excessive losses?) In one direction
it would demodulate only one sideband; while feeding audio
back into would in turn generate an SSB signal. IIRC, the
math shows the sidebands would be "reversed" between RX
and TX functions, however...
Pete k1zjh
>