Eddystone dial
 

Does anyone in the group have any idea of what an Eddystone dial, Model
898, is worth. I bought a new one, along with the parts for the Ted
Crosby HBR receiver many years ago, but never got around to building
it. The XYL is pushing me to downsize and I need to start somewhere. I
may have an interested party, but can list it on e-Bay if this falls
through. I'd like to get some idea of where to start.
Doc, W4ITJ

Eddystone dial
 

"Doc" wrote in message
ups.com...
Does anyone in the group have any idea of what an Eddystone dial, Model
898, is worth. I bought a new one, along with the parts for the Ted
Crosby HBR receiver many years ago, but never got around to building
it. The XYL is pushing me to downsize and I need to start somewhere. I
may have an interested party, but can list it on e-Bay if this falls
through. I'd like to get some idea of where to start.
Doc, W4ITJ

If this is the 898:
http://www.parelectronics.com/pics/w7zoi14.jpg


I bought mine on EBay for around $10.

Dale W4OP

Eddystone dial
 

Doc wrote:
Does anyone in the group have any idea of what an Eddystone dial, Model
898, is worth. I bought a new one, along with the parts for the Ted
Crosby HBR receiver many years ago, but never got around to building
it. The XYL is pushing me to downsize and I need to start somewhere. I
may have an interested party, but can list it on e-Bay if this falls
through. I'd like to get some idea of where to start.


If you have all the parts, I'd be interested in them all. I have lots
of dials, but would like to recreate the HBR receiver I built in the
early 60's.

As for the dial, expect about 30-50 dollars. You might do better, but
most fall in that range.

73 Tom

Eddystone dial
 

Dale W4OP,

Dale,

I believe you posted an e-mail and a link to QRP-L a while back to show
your receiver. Should have said this before but better late than never.
Nice job.

If I remember correctly you used a basic 160M receiver with multiple
front end convertors. Also I believe you used blue backlighting?

Don,

K5UOS

Eddystone dial
 

wrote in message
oups.com...
Dale W4OP,

Dale,

I believe you posted an e-mail and a link to QRP-L a while back to show
your receiver. Should have said this before but better late than never.
Nice job.

If I remember correctly you used a basic 160M receiver with multiple
front end convertors. Also I believe you used blue backlighting?

Don,

K5UOS

Hi Don,
Thanks for the kind words. The receiver is based on W7ZOI's Progressive RX
from the late 80's. To Wes's excellent design I added,
S meter
AM detection
LM386 for loudspeaker w/ tone control
audio notch filter
Homebrew 5/2.5/.5 xtal filters
fast/slow/off AGC

80M RX with xtal controlled converters for 160/49/40/20/15/10ABC
The VFO drifts a little over 150Hz in the 1st 5 minutes then settles down to
+/- 20Hz in a 5 minute period. Wonderful sound and gets more use than the
PRO II
73,

Dale W4OP

Eddystone dial and custom dial plates
 

Well Dale it looks very nice and obviously works well too. I thought I
remembered you saying the Progressive Receiver. I am glad I had a
chance to compliment you.

Since the subject was the Eddiestone dial I expect that was probably a
chore to install. I usually build homebrew dial chord and drum
mechanisms and more recently use the flange type Jackson Brothers and
Oren Elliot drives. I just figured out a way to make custom dial
plates. Probably an old idea but new to me.

I just finished a 40M receiver for a SSB transceiver. I thought about
using a small blank CD for the dial plate. What I ended up doing was
getting a piece of brass sheet from ACE Hardware and using a 2 1/4"
hole saw (my chassis panel is 3") I cut a round disc. I had a small
amount of deburring to do but the brass is way tougher than aluminum
and a simple file removed the burrs. The 3/8" drill bit also provided a
true center for the dial plate. I polished it with super fine auto
rubbing compound. I ended up with a nice dial plate.

I need to mount it to a small shaft section of a vernier capacitor from
Ocean State Electronics. I took a shaft coupler, the type with
removable couplings on both sides, and using very tiny scews mounted
this removable portion of the coupling to the plate.

Its hard to describe. But I am pleased with myself as I a mechanically
weak.

This is a good method for making custom dial plates. I had to use a
good chord type drill as my cordless was getting warm. I also mounted
the plate for drilling using two wood screws and fastening the uncut
plate to a scrap 2 x 4 by drilling holes slightly above and below my
cut.

Now I gotta figure out how to mark the plate. Well maybe I will catch
you on the air sometime Dale.

K5UOS

Dale Parfitt wrote:
wrote in message
oups.com...
Dale W4OP,

Dale,

I believe you posted an e-mail and a link to QRP-L a while back to show
your receiver. Should have said this before but better late than never.
Nice job.

If I remember correctly you used a basic 160M receiver with multiple
front end convertors. Also I believe you used blue backlighting?

Don,

K5UOS

Hi Don,
Thanks for the kind words. The receiver is based on W7ZOI's Progressive RX
from the late 80's. To Wes's excellent design I added,
S meter
AM detection
LM386 for loudspeaker w/ tone control
audio notch filter
Homebrew 5/2.5/.5 xtal filters
fast/slow/off AGC

80M RX with xtal controlled converters for 160/49/40/20/15/10ABC
The VFO drifts a little over 150Hz in the 1st 5 minutes then settles down to
+/- 20Hz in a 5 minute period. Wonderful sound and gets more use than the
PRO II
73,

Dale W4OP

Eddystone dial and custom dial plates
 

Don (and Dale, if you're still listening),
I apologize in advance for not snipping this reply, but I want to
preserve the whole thread and file it to my Hints and Kinks folder on
the hard drive, for that dial mechanism.

Speaking of the Progressive Receiver, I was thinking about building
one myself a couple of months ago. At the end of the article in the
November '81 QST, Wes shows the math to figure out capacitor values
for the VFO. Well, I spreadsheeted that, and I may have found an
error. I check for errata on the ARRL site, and didn't find any
further references.

Everything checks out perfectly until the last step, where he solves
for C3. Wes's example yields C3 = 127.02 X 10E-12 F.

My values show C3= 355 -(1/50 + 1/126.8) quantity to the -1 power,
which is 355 - 35.85 or 319.1 pF, not 127.02 pF. Did I mess up with
the math?

This is fairly significant to me, because I can see use for this
calculation beyond this particular project, never seeming to have the
right variable cap on hand. I floated this problem to the local NoGa
QRP math gurus, but it turns out I guess we don't have any :) . I
didn't really want to put it on qrp_tech.

Dale, I've commented to you previously on your magnificent receiver,
and Don, that's a nice idea on the dial plate. One thing you could do
is design the markings in a drawing program to fit your brass disk,
and then iron on a Press-n-Peel image to the brass, and etch it. Then
you could apply a layer of black paint to the disk, and carefully wipe
it off until only the etched areas remained with paint. Alternatively,
If your image is clear enough (reversed this time), you could simply
use that after ironing it on, and spray it with a fixative to protect
the toner and the brass. A couple of the guys were doing that for
panel legends.

Some of the guys in the homebrew_pcb Yahoo group have built their own
CNC milling machines, and the do their PC boards that way. That would
be good for this, as well.

72/73 to you both,
Ted KX4OM

On 26 Mar 2006 07:00:39 -0800, wrote:

Well Dale it looks very nice and obviously works well too. I thought I
remembered you saying the Progressive Receiver. I am glad I had a
chance to compliment you.

Since the subject was the Eddiestone dial I expect that was probably a
chore to install. I usually build homebrew dial chord and drum
mechanisms and more recently use the flange type Jackson Brothers and
Oren Elliot drives. I just figured out a way to make custom dial
plates. Probably an old idea but new to me.

I just finished a 40M receiver for a SSB transceiver. I thought about
using a small blank CD for the dial plate. What I ended up doing was
getting a piece of brass sheet from ACE Hardware and using a 2 1/4"
hole saw (my chassis panel is 3") I cut a round disc. I had a small
amount of deburring to do but the brass is way tougher than aluminum
and a simple file removed the burrs. The 3/8" drill bit also provided a
true center for the dial plate. I polished it with super fine auto
rubbing compound. I ended up with a nice dial plate.

I need to mount it to a small shaft section of a vernier capacitor from
Ocean State Electronics. I took a shaft coupler, the type with
removable couplings on both sides, and using very tiny scews mounted
this removable portion of the coupling to the plate.

Its hard to describe. But I am pleased with myself as I a mechanically
weak.

This is a good method for making custom dial plates. I had to use a
good chord type drill as my cordless was getting warm. I also mounted
the plate for drilling using two wood screws and fastening the uncut
plate to a scrap 2 x 4 by drilling holes slightly above and below my
cut.

Now I gotta figure out how to mark the plate. Well maybe I will catch
you on the air sometime Dale.

K5UOS

Dale Parfitt wrote:
wrote in message
oups.com...
Dale W4OP,

Dale,

I believe you posted an e-mail and a link to QRP-L a while back to show
your receiver. Should have said this before but better late than never.
Nice job.

If I remember correctly you used a basic 160M receiver with multiple
front end convertors. Also I believe you used blue backlighting?

Don,

K5UOS

Hi Don,
Thanks for the kind words. The receiver is based on W7ZOI's Progressive RX
from the late 80's. To Wes's excellent design I added,
S meter
AM detection
LM386 for loudspeaker w/ tone control
audio notch filter
Homebrew 5/2.5/.5 xtal filters
fast/slow/off AGC

80M RX with xtal controlled converters for 160/49/40/20/15/10ABC
The VFO drifts a little over 150Hz in the 1st 5 minutes then settles down to
+/- 20Hz in a 5 minute period. Wonderful sound and gets more use than the
PRO II
73,

Dale W4OP

Eddystone dial
 

Eddystone dial and Nugatory Numpties?
 

Don, et al,
Comments in-line:

On 1 Apr 2006 12:29:49 -0800, wrote:

Ted, Dale, Ken,

Ken that is true about the hen's teeth. I think that price is worth it
though. Dales receiver looks like a 2B. The blue backlighting is really
cool.

Dale's receiver looks like it belongs in a hospital, inside the case,
anyway...I'm sure an artificial liver or whatever doesn't have any
more "tubing" connections! That's taking the art of modular
construction to a whole 'nother level! The receiver also looks very
"sanitary", as we used to say back in the '70s, or I guess the word
would be "sick" in today's vernacular. More hospital tie-ins,
yuk-yuk!

I just like making homebrew verniers and dials but am getting lazy and
have been using Jackson Bros.stuff for the last two projects. I tried
what I believe is an Oren Elliot drive but it is so stiff I didn't use
it. One of the last projects used a small CD for the dial. Looks clever
and homebrewish but kinda tacky too. I am dangerous with certain tools
in my hands so I try to use ready made stuff. But the dial on my SSB
transceiver needed a little more work due to the way the dial had to
mounted. I am pleased with my mechanically challenged self. I'll follow
Dales and your advice and create it on my PC. Sharpy usually used here.

I won a door prize at the last NoGa meeting of a National Velvet
vernier. I don't have it handy for the number, but it's a fairly
small one...the dial area is about 3" wide. The cardboard scale has
been humidified somewhere along the way, so I'll need to scan that and
redo it in photoshop. The gears are ok, but a bit stiff. It looks
like it will be perfect for a VFO, maybe my long-wanted heterodyne VFO
for the HT-40.

Ted, on the VFO I roughly calculate the L and C from a few old DeMaw
and Hayward publications. But I generally go for less L more C. I think
those calculations are rough approximations anyways. I think the 2nd
edition of DeMaws QRP Notebook has the rough equations for Colpitts and
Clapp. I haven't seen one for Hartley. I have several old toroids wound
that I use for various things like VFO's. I used a number in the
Huffpuff circuit Hans Summers designed and substituted for
experimentation and optimum performance. I also have a bunch of cut and
try capacitors I use when I am building something like a VFO. I am
afraid to admit I do a lot of empirical construction on VFO's. Just the
opposite on filters and amplifiers. I use my SA when I build LC filters
and I measure all my critical L and C with my homebrew LC meter.
One thing I learned was to use ugly construction on my VFO's. I don't
know the fellow but W7EL mentioned something somewhere that made me try
that method. It simpler at the very least.

From what I understand, all other things being equal, the inductor is
more likely to suffer the effects of temperature-induced drift than
the capacitors, as long as C0G/NP0 and polystyrene caps are used.
Therefore, it makes sense to have a higher C to L ratio, although the
configuration of the VFO circuit will probably impose limits, as in
failure to oscillate at some point. I generally look at somebody
else's design as a prototype, and try to work around the same ratiios.

I went over and over the calculations again, and I'm pretty sure I'm
right, and there's a typo in the "Progressive Receiver" appendix. Then
it suddenly occurred to me, " Why don't you just lash up the
capacitors and the inductor and measure the darn thing?" Duh! I have
a grid dip meter, and I'm still making use of my cheap-but-fairly
accurate Rainbow capacitance meter, the one from the Handbook, until I
get the PIC programmed for the "Everyday Practical Electronics" one
that the Columbus QRP club built. This mystery will soon be solved!

Ted maybe I'll catch you on the other site but did you get the VFO
working? I knew you were working on a Hartley Huff Puff VFO. I tried
link coupling on the output from my Pierce version from the coil and
was suprised at how much cleaner the output was. I was going to try the
control circuit from a link too but had my grandson over the last two
weekends. He is just discovering his feet and rolling over. It is an
important time for grandpas.

One of the Hartley designs I'm looking at for the LO of my EMRFD
transceiver project is the Fig. 6.148 4 MHz one, which I would conver
to 5 MHz. Now that one is tapped, but what you did Don was to not tap
the coil, but to add a coupling winding, as I understand it. In the
Figure I just mentioned, Wes has an MV209 on the tap for fine tuning,
so I guess that's where the Huff and Puff would attach.

The other circuit I've been studying to the point of actually cadding
it, is Figure 12.25 in EMRFD. That one also has the familiar C1 C2 C3
Cvariable issue I've been trying to figure out, as does the Hartley
above. This VFO is a Colpitts, though (I guess; the output is off the
gate alone, and not the source). I suppose I'd either tap onto the
coil or use a coupling winding on that one, similar to what you did.
Conveniently, this one is a 5 MHz VFO already.

I just put in the order to Digi-Key a couple of days ago for the chips
for the fast stabilizer, so no, I haven't built it yet. I decided not
to go ahead with the other 2-chip minimalist one after your suggestion
on the fast one. The crystal oscillator I ordered is 66.66 MHz, so it
should work.

Its spring yardwork weekend here so not much radio going on. BTW, what
is a Nugatory Numptie (see other post)? I could be one. Do we have a
website?

K5UOS

I've got to go back and look at the other post. Don't know how I
missed that!

Ted KX4OM

Eddystone dial and Nugatory Numpties?
 

Using those old verniers is risky to me only because finding
replacements if they start to slip or have backlash. I at least try to
find or build something I can replace. But the Eddiestone are just so
nice looking.

What I did on the HP VFO was like in fig 7.27 EMRFD. The output of the
IC is a square wave. I was concerned after I looked at the output on my
analyzer. I see why the cmos marker generators are so popular. Strong
harmonics way above 100MHz. The output was significantly cleaner from
the tap. Right around then I decided to go back and finish my SSB
receiver and mount it in the chassis so I didn't have to use so many
clip leads while I was playing with it.

I was going to do something similar to the fig 12.25 mixing type LO and
I still may. My original receiver had a 9MHz filter but a relatively
strong birdy from the LO at 7.2MHz. I decided to just change the filter
to 9.216MHz and no birdies. Was hell trying to find closely matched
9.216MHz crystals though. I got 65 ea from Mouser and only got ten
within 5%. Mostly a wide discrepancy in ESR. I guess you can make up
for a lossy filter but after spending as much time as I did on both
filters in measuring crystals I wanted something to show for it.

I was going to try the control circuit on the tap in my HP VFO. I know
it will work thiough even though I haven't tried it. Its just getting
the correct link and varactor. The fast HP VFO's still amazes me.
I get started on too many things so I went back to my SSB rig.

On the inductor drift I agree. I seem to have luck with slightly lower
L and using the slight neg temp coefficient of the COG caps. I did that
in my tube receiver built with toroids. I ended up using a small silver
mica for temp compensation of all things. Like you I look at other
circuits and copy. I didn't on this VFO because I was copying my own
circuit that worked before from something I am sure I copied. The more
I try other things though the less I copy. Right now I am working on a
25 VDC 6AMP power supply for the transceiver. I am going to try power
mosfets again as I had good luck in the last low power linear I built.
I am only looking for 40W or so. Plenty big for the type of SSB I will
work. I have a 28 VDC 3 A supply I made years ago. Just not sure it is
big enough for the PA I am going to use. Its not that efficient.

Gosh, typo errors in ham publications! Hard to believe! Not!. Good for
you for checking. I have a mess of spreadsheets with most of the common
formulas. I also made some for double and triple tuned BP filters,
feedback amps, my LC meter calculations, a logarithmic power meter and
crystal parameter testing. I check a lot of circuits in books by
plugging in the data to my sheets.

EMRFD is a great book. One thing I have been using in my transceiver LO
now is the hybrid splitter shown in fig 6.75. The vfo in 12.25 shows a
resistive version. I used the hybrid on both my VFO and BFO. That is a
nice technique even if it is a few more parts. I guess Wes must be a
better Numptie than all of us?

I bet you will really enjoy experimenting with the fast HP VFO. I
haven't had that much fun with a simple project in a long time. Once
you build a few you start getting alot of ideas on how to use it. Then
it starts adding to your list of projects. You start losing sleep, the
wife keeps asking you to take the trash out, you stop shaving, grow
your hair long and start smoking and drinking too much coffee. Then you
are in Nugatory. Thats ham purgatory. My wife calls it the doghouse.

Maybe I will put a picture of my progress on the SSB transceiver on the
tech site soon. I never know what Chuck is willing to accept though. So
I get a little cautious.

Keep me up on your progress.

Eddystone dial and custom dial plates
 

Hi Don and Ted,
While it has been over a year now since I did the VFO- I too had some
difficulties with the QST values. In talking w/ W7ZOI, Wes indicated that
some errors had worked their way into the design over the years. One was on
the audio amp- values I had caused severe rolloff below about 2KHz- making
SSB very tinny.
The other was on the VFO. Because of the Eddystone dial, I wished to make
the VFO as linear as possible- book values led to a highly non linear scale.
I do not recall exactly what I did- although I played with the math for a
long time- to lienarize it- but I would trust your calcs.
At some point I will open her up again as I want to buffer the VFO and tap
off for a TX VFO- the plan is to build a Drake style reciter for the RX- and
at that time will better document the changes I made.

Dale W4OP

Eddystone dial and custom dial plates
 

Dale & Don,
I haven't had a chance to lash up the components yet, but I checked my
spreadsheet using Wes's example on page 4.4. The numbers check out;
unfortunately, Wes specifies a value for C3 in the EMRFD example, and
in the Progressive Receiver Article, C3 is the unknown; i.e., how much
additional capacitance you'd have to add in parallel with the coil to
use a specific variable cap in the given configuration.
Now that I can see the "C12v" equation in EMRFD, which is not in the
QST article, but I've modified my spreadsheet to include it I can
check the resonance using the given values for L.

Dale, when I looked at your jpg's again yesterday, I noticed that
you've modified the receiver internals a lot since I first saw the
rig. Since the links I had were to a directory on your commercial
site, I'm not sure if you have another site where you described what
you did.

Early last Spring, I got rid of all my new-fangled ham rigs, like the
FT-817 and the not-so-new, but pristine TS-530s and bought an HW-101
and some equipment to restore. Homebrewing and boatanchors is what
I'm about now. I did the VFO alignment on the HW-101 and was able to
get it within 1kHz, end to end, as indicated on the dial, anyway. That
surprised the heck out of me. I've since acquired an LMO from an
SB-401 that I'm going to put in a project somewhere along the line. I
have a complete set of Heath HFO crystals, and both CW and SSB filters
from another source. I might make myself a broadbanded QRP rig out of
those.

73,
Ted KX4OM


On Sun, 02 Apr 2006 02:20:25 GMT, "Dale Parfitt"
wrote:

Hi Don and Ted,
While it has been over a year now since I did the VFO- I too had some
difficulties with the QST values. In talking w/ W7ZOI, Wes indicated that
some errors had worked their way into the design over the years. One was on
the audio amp- values I had caused severe rolloff below about 2KHz- making
SSB very tinny.
The other was on the VFO. Because of the Eddystone dial, I wished to make
the VFO as linear as possible- book values led to a highly non linear scale.
I do not recall exactly what I did- although I played with the math for a
long time- to lienarize it- but I would trust your calcs.
At some point I will open her up again as I want to buffer the VFO and tap
off for a TX VFO- the plan is to build a Drake style reciter for the RX- and
at that time will better document the changes I made.

Dale W4OP

Eddystone dial and Nugatory Numpties?
 

On 1 Apr 2006 15:55:06 -0800, wrote:

Using those old verniers is risky to me only because finding
replacements if they start to slip or have backlash. I at least try to
find or build something I can replace. But the Eddiestone are just so
nice looking.
Well, maybe this one WILL be nice looking :)

What I did on the HP VFO was like in fig 7.27 EMRFD. The output of the
IC is a square wave. I was concerned after I looked at the output on my
analyzer. I see why the cmos marker generators are so popular. Strong
harmonics way above 100MHz. The output was significantly cleaner from
the tap. Right around then I decided to go back and finish my SSB
receiver and mount it in the chassis so I didn't have to use so many
clip leads while I was playing with it.
Figure 7.27? I don't quite follow that, unless you're talking about
how you've band-switched it.

I was going to do something similar to the fig 12.25 mixing type LO and
I still may. My original receiver had a 9MHz filter but a relatively
strong birdy from the LO at 7.2MHz. I decided to just change the filter
to 9.216MHz and no birdies. Was hell trying to find closely matched
9.216MHz crystals though. I got 65 ea from Mouser and only got ten
within 5%. Mostly a wide discrepancy in ESR. I guess you can make up
for a lossy filter but after spending as much time as I did on both
filters in measuring crystals I wanted something to show for it.
I'm using that design because I'll need 2 HFO's in two separate rigs
I'm working on. That one is interesting because of the 5 MHz output,
but I won't be using that for the rig itself. I'm using a 74HC4053
switch to mix either of two LOs with the 5 MHz VFO. The transceiver
I'm using EMRFD circuits for is a 15 and 20 meter SSB/CW traansceiver.
I'm using a 9MHz If, with HFO frequencies of 25 and 18 MHz. I'll use
the sums to produce the correct LO frequencies.

The other rig is one I've been working on, off and on, for over a
year. That one is based on G4GXOs Belthorn SSB/IF module. I picked
an IF of 11 MHz for it, because 32 and 25 MHz HFO crystals will allow
me to use a VFO of the toal span of 3.890 4.148 MHz. All of the
crystals are Mouser 39-cent variety.

I didn't realize it, but when I put in my order from Digi-Key last
wee, I stumbled across the ECS 18 MHz crystal, a value I didn't have
in my data base of available frequencies...that allows me to make the
EMRFD rig a 2-bander, adding 20 meters!

I was going to try the control circuit on the tap in my HP VFO. I know
it will work thiough even though I haven't tried it. Its just getting
the correct link and varactor. The fast HP VFO's still amazes me.
I get started on too many things so I went back to my SSB rig.

On the inductor drift I agree. I seem to have luck with slightly lower
L and using the slight neg temp coefficient of the COG caps. I did that
in my tube receiver built with toroids. I ended up using a small silver
mica for temp compensation of all things. Like you I look at other
circuits and copy. I didn't on this VFO because I was copying my own
circuit that worked before from something I am sure I copied. The more
I try other things though the less I copy. Right now I am working on a
25 VDC 6AMP power supply for the transceiver. I am going to try power
mosfets again as I had good luck in the last low power linear I built.
I am only looking for 40W or so. Plenty big for the type of SSB I will
work. I have a 28 VDC 3 A supply I made years ago. Just not sure it is
big enough for the PA I am going to use. Its not that efficient.

Gosh, typo errors in ham publications! Hard to believe! Not!. Good for
you for checking. I have a mess of spreadsheets with most of the common
formulas. I also made some for double and triple tuned BP filters,
feedback amps, my LC meter calculations, a logarithmic power meter and
crystal parameter testing. I check a lot of circuits in books by
plugging in the data to my sheets.

EMRFD is a great book. One thing I have been using in my transceiver LO
now is the hybrid splitter shown in fig 6.75. The vfo in 12.25 shows a
resistive version. I used the hybrid on both my VFO and BFO. That is a
nice technique even if it is a few more parts. I guess Wes must be a
better Numptie than all of us?
I'm not sure I really knew much of anything until I got EMRFD. The
first few weeks, I had a running stream of Q&A emails with Wes, and he
was kind enough to be patient and explain some things. One in
particular was a problem I had in adapting a published L-network to
the actual impedances of my crystal filter in the 30 meter rig I built
for Straight Key Night .

In Fig. 12.25, he's actually using the take-off point from the VFO to
the mixer from the attenuator pad for the 5 MHz output, to get the -10
dBm for 5 MHz for the 20 meter part of the rig.

I bet you will really enjoy experimenting with the fast HP VFO. I
haven't had that much fun with a simple project in a long time. Once
you build a few you start getting alot of ideas on how to use it. Then
it starts adding to your list of projects. You start losing sleep, the
wife keeps asking you to take the trash out, you stop shaving, grow
your hair long and start smoking and drinking too much coffee. Then you
are in Nugatory. Thats ham purgatory. My wife calls it the doghouse.
Sleep? What's that? Fortunately, my wife is busy getting her business
up and running, and I have plenty of time on my hands (I've inherited
the dog and cat-tending responsibilities).

Maybe I will put a picture of my progress on the SSB transceiver on the
tech site soon. I never know what Chuck is willing to accept though. So
I get a little cautious.
I understand completely. However, why not start a folder anyway?
There's only a couple of them there, and it's not like it's stuff that
belongs in the Smithsonian. Now if Dale had his receiver on the site,
that's certainly Smithsonian-quality!

When I was building the SKN Special, I did running updates to the NoGa
list with the latest photos on my web site. Now that it's finished, I
recently went back and reorganized that page to reflect past tense.
One of the highlights was definitely getting the VFO going. On the
scope, the signal has a weird distortion in the sine wave, like the
trailing edge is partially scooped out; I should post that on the
yahoo group site and see if anyone can figure out what it means. But,
since it's feeding an NE602, and they can take square waves, I guess a
little distortion doesn't matter.

Keep me up on your progress.
Tomorrow, I lash up a test capacitance circuit. Then, once I can
finally do the math and figure out which variable I can use, I'll
start building. the Digi-Key prts for the Huff and Puff whould be
here mid-week.

72/73,
Ted KX4OM

Eddystone dial and custom dial plates
 

"Ted" wrote in message
...
Dale & Don,
I haven't had a chance to lash up the components yet, but I checked my
spreadsheet using Wes's example on page 4.4. The numbers check out;
unfortunately, Wes specifies a value for C3 in the EMRFD example, and
in the Progressive Receiver Article, C3 is the unknown; i.e., how much
additional capacitance you'd have to add in parallel with the coil to
use a specific variable cap in the given configuration.
Now that I can see the "C12v" equation in EMRFD, which is not in the
QST article, but I've modified my spreadsheet to include it I can
check the resonance using the given values for L.

Dale, when I looked at your jpg's again yesterday, I noticed that
you've modified the receiver internals a lot since I first saw the
rig. Since the links I had were to a directory on your commercial
site, I'm not sure if you have another site where you described what
you did.

Early last Spring, I got rid of all my new-fangled ham rigs, like the
FT-817 and the not-so-new, but pristine TS-530s and bought an HW-101
and some equipment to restore. Homebrewing and boatanchors is what
I'm about now. I did the VFO alignment on the HW-101 and was able to
get it within 1kHz, end to end, as indicated on the dial, anyway. That
surprised the heck out of me. I've since acquired an LMO from an
SB-401 that I'm going to put in a project somewhere along the line. I
have a complete set of Heath HFO crystals, and both CW and SSB filters
from another source. I might make myself a broadbanded QRP rig out of
those.

73,
Ted KX4OM

Hi Ted,
I quickly looked at the VFO schematic in my1994 Handbook that had the PR. I
seem to recall in the end I replaced C1 with a short- just eliminating it.
Not 100% positive, but think that was what it came down to in order to get
good linearity out of my VFO.

Dale

Eddystone dial and custom dial plates
 

On Mon, 03 Apr 2006 01:37:23 GMT, "Dale Parfitt"
wrote:


Hi Ted,
I quickly looked at the VFO schematic in my1994 Handbook that had the PR. I
seem to recall in the end I replaced C1 with a short- just eliminating it.
Not 100% positive, but think that was what it came down to in order to get
good linearity out of my VFO.

Dale

Dale,
I'll check that out. My value for C3 from the spreadsheet came out to
be 319.1 vs the 127.02 in the magazine. I used the spreadsheet on the
example on page 4.4 of EMRFd and it worked out ok. In the QST
example, setting C1 to a very low value actually increases the
discrepancy with C3, though. More mystery!

Tnx,
Ted KX4OM

Eddystone dial and custom dial plates
 

"Ted" wrote in message
...
On Mon, 03 Apr 2006 01:37:23 GMT, "Dale Parfitt"
wrote:


Hi Ted,
I quickly looked at the VFO schematic in my1994 Handbook that had the PR.
I
seem to recall in the end I replaced C1 with a short- just eliminating it.
Not 100% positive, but think that was what it came down to in order to
get
good linearity out of my VFO.

Dale

Dale,
I'll check that out. My value for C3 from the spreadsheet came out to
be 319.1 vs the 127.02 in the magazine. I used the spreadsheet on the
example on page 4.4 of EMRFd and it worked out ok. In the QST
example, setting C1 to a very low value actually increases the
discrepancy with C3, though. More mystery!

Tnx,
Ted KX4OM
Hi Ted,
No doubt, the VFO could be put on the correct freq range with C3 included-
it was just very nonlinear.

Dale

Eddystone dial
 

Doc wrote:
Does anyone in the group have any idea of what an Eddystone dial, Model
898, is worth. I bought a new one, along with the parts for the Ted
Crosby HBR receiver many years ago, but never got around to building
it. The XYL is pushing me to downsize and I need to start somewhere. I
may have an interested party, but can list it on e-Bay if this falls
through. I'd like to get some idea of where to start.
Doc, W4ITJ

Hi Doc:

I bought a good 898 recently for £30 which I guess is around $44.

Regards, Chris M0HMR