[Hammarlund] RE;dumb tuning
John Morris
[email protected]
Tue, 17 Sep 2002 20:44:05 -0400
I concur with the HP606A suggestion. Mine is rock solid.=20
Got it for $25 but had to put another $30 worth of 12B4's in it. If =
you've ever opened one up, it is easy to see why the output frequency is =
so stable. I've never seem such shielding and "fit and finish".=20
I also agree with Cecil on the availability of good test equip on eBay. =
Probably the one catagory where the buyer can get a deal. I bought a =
pair of scopes there and both came with more accessories than were =
advertised.
John - WB=D8RLD
----- Original Message -----=20
From: Cecil Acuff=20
To: Mike McCoy ; Joel R. Hallas ; Hammarlund=20
Sent: Tuesday, September 17, 2002 10:49 PM
Subject: Re: [Hammarlund] RE;dumb tuning
Evening Mike and group,
My recommendation would be a nice HP 606A or B. It covers
everything you might run into as far as freq coverage in aligning =
Boatanchor
receivers. It has a great attenuator, nice easy to read meters and
frequency display...not to mention the vernier for fine freq =
adjustment.
It's a little on the large side but built like a tank. Mine was =
shipped
east of the Miss. River from CA and arrived dead on freq.
I also have an AN/URM 25 but find it a little confusing to use for the
casual user. I don't really care for it...but many guys like it.
I would add a nice frequency counter to improve the =
accuracy....something
with a high input impedance if you can find one so it can stay "T"ed =
into
the output without adding too much load. I am using an HP....can't =
remember
the model but it has 1meg inputs as well as 50 ohm inputs. The =
counter
will not be sensitive enough to read after you drop the level down =
pretty
low during an alignment but once one of these nice generators are set =
on
freq. they don't move around too much!
You should be able to pick up a nice 606 and counter from the "E" =
place for
around $300-$350 with shipping. I have found the "E" place to be an
excellent place to purchase test gear....just check out the sellers
feedback....
My 2 cents worth...
Cecil Acuff....
----- Original Message -----
From: "Mike McCoy" <[email protected]>
To: "Joel R. Hallas" <[email protected]>; "Hammarlund"
<[email protected]>
Sent: Tuesday, September 17, 2002 7:24 PM
Subject: Re: [Hammarlund] RE;dumb tuning
> Understood something 'cheap' certainly has its limitations. But I'm =
just a
> hobbiest and have no desire/need to spend hundreds of $$$ on =
something I
> would only use occasionally.
>
> Still, does anyone have any recommendations for a sig gen that would
suffice
> for aligning these ol BA's (even if it took longer than what would =
be
> acceptable in a 'real' shop)? Something that maybe could be found on =
eBay
> for a reasonable (e.g. hobbiest) sum?
>
> One of my problems searching for an inexpensive sig gen is not =
knowing
which
> ones provide an unmodulated output (vs sine/square wave generators)
>
> -Mike
>
> ----- Original Message -----
> From: "Joel R. Hallas" <[email protected]>
> To: "Ed Shafer" <[email protected]>; "Hammarlund"
> <[email protected]>
> Sent: Monday, September 16, 2002 8:00 PM
> Subject: Re: [Hammarlund] RE;dumb tuning
>
>
> > Ed,
> >
> > A cheap and accurate signal generator sounds like a holy grail! =
Even
> expensive ones aren't
> > often accurate enuf to do what you want to do. What I use is a =
cheap
> signal generator with
> > a cheap counter in the line to the receiver, solves most problems. =
I
also
> have a step
> > attenuator between the counter and the receiver so I can reduce =
the
level
> and keep the
> > counter happy.
> >
> > Has worked for many receivers.
> >
> > GL & 73, Joel, W1ZR
> >
> > Ed Shafer wrote:
> >
> > > Mike,
> > >
> > > I too have an HQ-180 and I am really pleased with it in all =
respects.
I
> tried for quite
> > > a while to get the tracking right, but still can't get it on the =
mark
> everywhere. I
> > > really don't have the equipment that would make the job easy, so =
as
you
> said, tried to
> > > make do with the crystal calibrator, and harmonics from a fairly
> accurate 80 meter vfo
> > > to get the frequencies right. I feel pretty sure that it could =
be
better
> than I've
> > > gotten it, and was glad to hear your opinion about the potential
> accuracy that could be
> > > achieved. Still, just using the calibrator to spot myself, I can =
find
> anything I want
> > > to on any band. It just doesn't track evenly from one end to the
other.
> As you say,
> > > it's a labor of love...I put probably 10 honest hours in on this =
and
> wish I'd gotten a
> > > little closer to perfect. Still, it's the best receiver I've =
ever
owned.
> I love the
> > > selectivity filters...in the .5 position I can single out a cw =
signal
in
> a crowd, and
> > > the slot filter is also quite a nice thing to have!
> > >
> > > Ed N5YX
> > >
> > > p.s. I am looking for a signal generator to try to do this =
again,
> preferably cheap and
> > > accurate, if anyone has anything to offer.
> > >
> > > --- Mike Taylor <[email protected]> wrote:
> > > > some interesting discussion about mike mcoy's question on his
> hammarlund
> > > > hq-180. what we're talking about here is what's called =
"tracking".
in
> other
> > > > words, the ability to set the tuning dial on any dial marker =
and
> that's the
> > > > actual frequency you're tuned to. the hq-180 can do this. in a
perfect
> > > > world, we would all have singal generators that are 100% =
accurate
> which
> > > > would make alignment simple. few of us do. so the crystal =
calibrator
> has to
> > > > suffice during alignment and you need reliable reference =
points
(like
> wwv).
> > > > the highest band is difficult because there are so many dial =
marks
> spaced so
> > > > close together. so mike, if your oscillator is even just =
100khz off
it
> can
> > > > be impossible to figure out where you are. i've managed to get =
just
> about
> > > > perfect dial tracking on both my hammarlunds, but it's tedious =
to do
> and
> > > > truly a labor of love. i'd like to know how many other folks =
have
> managed to
> > > > get nearly perfect tracking on their hammarlunds and how much =
of a
> pain it
> > > > was to accomplish. 73's...mike [email protected]
> > >
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