Anyone who has a scrapped Yaesu / Sommerkamp HF rig from
30 years ago, or so, will find that for both TX and RX, the
tunable IF covers the 60m / 5MHz band.

On 30/11/2014 13:16, gareth wrote:
Anyone who has a scrapped Yaesu / Sommerkamp HF rig from
30 years ago, or so, will find that for both TX and RX, the
tunable IF covers the 60m / 5MHz band.

The IF is not tunable. It's fixed at 9MHz. It's the VFO that covers 5.0
to 5.5MHz.

In message , Jeefaw K. Effkay
writes
On 30/11/2014 13:16, gareth wrote:
Anyone who has a scrapped Yaesu / Sommerkamp HF rig from
30 years ago, or so, will find that for both TX and RX, the
tunable IF covers the 60m / 5MHz band.

The IF is not tunable. It's fixed at 9MHz. It's the VFO that covers 5.0
to 5.5MHz.



My FT560 has a tunable IF of 5.520 to 6.020MHz IF is 3.180MHz
-sidebands would be the wrong way round .

http://www.radiomanual.info/schemi/FTdx560_user.pdf

DIJ

--
Brian Howie

On 01/12/2014 08:10, Brian Howie wrote:
In message , Jeefaw K. Effkay
writes
On 30/11/2014 13:16, gareth wrote:
Anyone who has a scrapped Yaesu / Sommerkamp HF rig from
30 years ago, or so, will find that for both TX and RX, the
tunable IF covers the 60m / 5MHz band.

The IF is not tunable. It's fixed at 9MHz. It's the VFO that covers
5.0 to 5.5MHz.



My FT560 has a tunable IF of 5.520 to 6.020MHz IF is 3.180MHz
-sidebands would be the wrong way round .

http://www.radiomanual.info/schemi/FTdx560_user.pdf

Interesting ... I was referring to the FT-200, and I believe the FT-101E
and its derivatives have a similar mixing arrangements, though with
different combinations of VFO and pre-mix frequencies.

I suspect the FT-200 would be impossible to mod for 60m, as the required
frequencies are in the middle of its VFO coverage. Are there any mods
out there for the other 70s vintage FTs?

In message , Brian Howie
writes
In message , Jeefaw K. Effkay
writes
On 30/11/2014 13:16, gareth wrote:
Anyone who has a scrapped Yaesu / Sommerkamp HF rig from
30 years ago, or so, will find that for both TX and RX, the
tunable IF covers the 60m / 5MHz band.

The IF is not tunable. It's fixed at 9MHz. It's the VFO that covers
5.0 to 5.5MHz.



My FT560 has a tunable IF of 5.520 to 6.020MHz IF is 3.180MHz
-sidebands would be the wrong way round .

http://www.radiomanual.info/schemi/FTdx560_user.pdf

I've only had a quick look, but it looks like the first IF is a fixed
5.520 to 6.020MHz (wideband bandpass filter) - ie a sort-of roofing
filter, and not tuneable.


--
Ian

In message , Ian Jackson
writes
In message , Brian Howie
writes
In message , Jeefaw K. Effkay
writes
On 30/11/2014 13:16, gareth wrote:
Anyone who has a scrapped Yaesu / Sommerkamp HF rig from
30 years ago, or so, will find that for both TX and RX, the
tunable IF covers the 60m / 5MHz band.

The IF is not tunable. It's fixed at 9MHz. It's the VFO that covers
5.0 to 5.5MHz.



My FT560 has a tunable IF of 5.520 to 6.020MHz IF is 3.180MHz
-sidebands would be the wrong way round .

http://www.radiomanual.info/schemi/FTdx560_user.pdf

I've only had a quick look, but it looks like the first IF is a fixed
5.520 to 6.020MHz (wideband bandpass filter) - ie a sort-of roofing
filter, and not tuneable.


Yes it's wideband but the vfo is 9MHz and together with thie 3MHz IF
selects the frequency within the pass-band . 9-3 =6
--
Brian Howie

In message
, Brian
Reay writes
Brian Howie wrote:
In message , Jeefaw K. Effkay
writes
On 30/11/2014 13:16, gareth wrote:
Anyone who has a scrapped Yaesu / Sommerkamp HF rig from
30 years ago, or so, will find that for both TX and RX, the
tunable IF covers the 60m / 5MHz band.

The IF is not tunable. It's fixed at 9MHz. It's the VFO that covers
5.0 to 5.5MHz.



My FT560 has a tunable IF of 5.520 to 6.020MHz IF is 3.180MHz
-sidebands would be the wrong way round .

http://www.radiomanual.info/schemi/FTdx560_user.pdf

DIJ

So it still doesn't cover 60m.

As for side bands being the wrong way around, a popular misconception. As I
recall it came up a few
months back and was discussed at some length. Jeff explained it rather
well, as I recall.


VFO is 8.7to 9.2 and 2nd IF is 3. 180

Quick and dirty sum.

VF0 is set to 9
Carrier is 3MHZ tone is 1KHz

USB is 3.001 LSB is 2.999

9-3 = 6

1KHz tone

USB 9-3.001 = 5.999 LSB in IF

LSB

9-.2.9.999 = 6.001 USB in IF

So the sidebands are reversed in tunable IF

for 14MHz conversion crystal is about 20MHz , when the tunable IF is
subtracted, the sidebands are the right way round again.

Other rigs are probably different. Yes and this one doesn't cover
60m.Enthusiasts might want to try it for different Yaesu rigs. The FT101
looks the same. Some with the 9MHz IF might work out differently.

Brian


--
Brian Howie

"gareth" wrote in message
...
Anyone who has a scrapped Yaesu / Sommerkamp HF rig from
30 years ago, or so, will find that for both TX and RX, the
tunable IF covers the 60m / 5MHz band.

I am thinking specifically of the FTDX560 / Sommerkamp 747 where the
tunable IF is 5.220 - 5.720, and covers down to 5.125 off the lower limits
of the VFO, IF is 3.180, so it is (was) essentially a 60M rig with an
Xtal controlled treansverter.

"Brian Reay" wrote in message
...
"Jeefaw K. Effkay" wrote:
On 30/11/2014 13:16, gareth wrote:
Anyone who has a scrapped Yaesu / Sommerkamp HF rig from
30 years ago, or so, will find that for both TX and RX, the
tunable IF covers the 60m / 5MHz band.

The IF is not tunable. It's fixed at 9MHz. It's the VFO that covers 5.0
to 5.5MHz.

How could someone with an RAE, who claims so much experience of homebrew,
and
the hobby in general make such an error?

Especially as, if say STC, happens to ask a question the same person
derides him without mercy.

Plus, of course, this is far from an isolated incident. If ever there was
evidence needed for retesting Full licence
holders, this is it. The danger is, OFCOM may think, based on this
individual, that testing must include all three exams, even for existing
Fulls.

Don't put ideas into their heads, Brian. That's far to much of a "nice
little earner" not to be implemented.
--
;-)
..
73 de Frank Turner-Smith G3VKI - mine's a pint.
..
http://turner-smith.co.uk

"gareth" wrote in message
...
"gareth" wrote in message
...
Anyone who has a scrapped Yaesu / Sommerkamp HF rig from
30 years ago, or so, will find that for both TX and RX, the
tunable IF covers the 60m / 5MHz band.

I am thinking specifically of the FTDX560 / Sommerkamp 747 where the
tunable IF is 5.220 - 5.720, and covers down to 5.125 off the lower limits
of the VFO, IF is 3.180, so it is (was) essentially a 60M rig with an
Xtal controlled treansverter.

As it happens, I have the VFO, XTAL filter and carrier Xtals from
a scrapped one of those, and had recently measured the vfo spread with a
view to making
a single-bandeer out of it.

Bearing in mind the rather silly and infantile abusive post from a certain
quarter,
does that post suggest that OfCom should consider retesting all those Class
Bers
who downgraded to a Fools' Licence because that very downgrading implied
only the technical competence of a Fools' Licensee?

Hoist by his own petard, what goes around comes around, or people who
live in glass houses, etc?