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Re: Website Anniversary

 

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Thank you, Bill!


Walt Cates, WD0GOF
?
A majority of acceptance is not proof of correctness.


From: [email protected] <[email protected]> on behalf of Bill (Group Owner) via groups.io <k2wh@...>
Sent: Friday, February 7, 2025 1:29 PM
To: [email protected] <[email protected]>
Subject: [HallicraftersRadios] Website Anniversary
?
Well believe it or not, its been 20 years, this site has been active and strong for Hallicrafters Radios.
?
Started in 2005 as a lark, I am amazed we now have 1,075 members.
?
With thanks to all our Hallicrafters Experts on this site and they are experts for sure.e
?
Regards, and have fun.

K2WH
Re: S-85 refurbish: I've got a problem during the RF alignment of bands 1 and 2 - trimcaps don't peak!

 

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Emanuele ???RE I decided to leave it alone, I give up.? ?Don’t do that, the radio is 99.777% ?, just some strange thing left. It’s ok to take a break and let the brain cool down.

I follow your comments again; all very clear.??

In my sleep, it came to mind that the main dial scale must be set properly. You no doubt have checked this, but maybe there was some slippage since then?

So ?maybe there are set screws on the dial scale hub? .. that might slip?

Also, you must know this but, at low frequencies, the RF tanks will tune much narrower, and so a bit of? unwanted offset will knock the signal down greatly.

Why not do a test: instead of setting the RF band 1 trimmers, at 1400 , set them at ?the low end 600,700? ..and see if they [RF1 and mixer tanks] can be tuned down there by turning the trimmers CW, and if it “aligns”, then try the ?real sensitivity at the low end using the antenna.? If it won’t align there, maybe take a scan of the tanks responses at say 600KCs so you can see if they are too high or too low. I hope you understand my wording. Then you might learn if it ?“tunes low” ?all over the band, or one end is low and the other hi. ?Since you have that Fancy HP gadget you must be able the verify the resonant curves of all tanks at the Hi and the Low end of the band{s}. OF course this is not aligning, it is testing ?to find out where things go wrong. ????????

Must be late there by now spero che tu stia dormendo bene

From: [email protected] [mailto:[email protected]] On Behalf Of Emanuele Girlando via groups.io
Sent: Friday, February 7, 2025 4:02 PM
To: [email protected]
Subject: Re: [HallicraftersRadios] S-85 refurbish: I've got a problem during the RF alignment of bands 1 and 2 - trimcaps don't peak!

?

Guys,

I performed a complete RF alignment once again.

I used a sig-gen and the SA just as a "receiver" to "see" the LO signal and followed the service manual instructions.

LO was fine in all bands with LO signal higher than the signal by the IF value (452KHz in my case) in all bands but the n. 4 where it was below.

The dials track the sig-gen signal with very low error in all bands.

The ANT and MIX trimcaps of bands 1&2 didn't peak, exactly as before. I had to leave them fully released (lower C) to get the MAX output possible.

During alignment the BS dial knob was fully CW and , I confirm once again, the BS cap had the plates all out (minimum capacity).

The radio performs well in all bands but the lower part of band 1 (<1MHz, as before).

?

I decided to leave it alone, I give up.

?

Thank you very much for your precious support, guys.

Ciao.

Emanuele (IU1KNR).

?

?


--
don??? va3drl
Re: S-85 refurbish: I've got a problem during the RF alignment of bands 1 and 2 - trimcaps don't peak!

 

Put it aside but don't give up on it.
How did you decide the IF frequency? When the IF has a crystal
filter the crystal determines the exact IF frequency but when there is
no crystal you just set the signal generator to the frequency defined in
the instructions, nearly always 455 Khz. The signal for aligning the IF
can be injected into the converter tube as per instructions, i.e. pin 8
through a 0.02uF cap. Actually, the IF can usually be aligned by feeding
the 455 signal into the antenna terminals. with the signal frequency at
about the middle of the dial. Set the signal generator for a weak
signal, you want no more signal than will overcome noise. Peak the six
adjustments to tune the IF to exactly 455 Khz and also adjust the BFO to
zero beat (also in the instructions. I don't think being off by a couple
of Khz is causing your problems but you might as well do it correctly. I
would go over the three IF transformers a couple of times to make sure
they are peaked and there is no interaction (should not be).
Now, what is going on here? A second receiver, or the SA, can
listen to the local oscillator. Make a sniffer loop to put over the
converter tube. check its frequency over the range on the broadcast
band. It should be 455 Khz _above_ the signal frequency at all points.
At the lowest frequency, say 540 Khz, the LO should be at 995 Khz. Check
it at three or four points up the dial. It should be reasonably close to
the signal plus 455 Khz all over. If you can't find it at the bottom end
start at mid point, or wherever you can receive some sort of signal and
tune down until it stops. What is the result of this? Since the
oscillator works at higher bands its not likely to be a short from dirt
or a bend in the plates but that is sill worth looking for. Make sure
you are not measuring the frequency wrong somehow. The problem is
impossible meaning something is being missed.
Poke at it some more and post back. I am fascinated by this and
don't mind at all trying to help. Lets save this antique, probably a
pretty good receiver when working and I suspect the problem is some sort
of illusion, look at it from a different angle and it may show up. DO
NOT GIVE UP.


On 2/7/2025 1:01 PM, Emanuele Girlando via groups.io wrote:
Guys,
I performed a complete RF alignment once again.
I used a sig-gen and the SA just as a "receiver" to "see" the LO signal
and followed the service manual instructions.
LO was fine in all bands with LO signal higher than the signal by the IF
value (452KHz in my case) in all bands but the n. 4 where it was below.
The dials track the sig-gen signal with very low error in all bands.
The ANT and MIX trimcaps of bands 1&2 didn't peak, exactly as before. I
had to leave them fully released (lower C) to get the MAX output possible.
During alignment the BS dial knob was fully CW and , I confirm once
again, the BS cap had the plates all out (minimum capacity).
The radio performs well in all bands but the lower part of band 1
(<1MHz, as before).
I decided to leave it alone, I give up.
Thank you very much for your precious support, guys.
Ciao.
Emanuele (IU1KNR).
<>

--
Richard Knoppow
Los Angeles
WB6KBL
SKCC 19998
Re: S-85 refurbish: I've got a problem during the RF alignment of bands 1 and 2 - trimcaps don't peak!

 

Guys,
I performed a complete RF alignment once again.
I used a sig-gen and the SA just as a "receiver" to "see" the LO signal and followed the service manual instructions.
LO was fine in all bands with LO signal higher than the signal by the IF value (452KHz in my case) in all bands but the n. 4 where it was below.
The dials track the sig-gen signal with very low error in all bands.
The ANT and MIX trimcaps of bands 1&2 didn't peak, exactly as before. I had to leave them fully released (lower C) to get the MAX output possible.
During alignment the BS dial knob was fully CW and , I confirm once again, the BS cap had the plates all out (minimum capacity).
The radio performs well in all bands but the lower part of band 1 (<1MHz, as before).
?
I decided to leave it alone, I give up.
?
Thank you very much for your precious support, guys.
Ciao.
Emanuele (IU1KNR).
?
?
Re: Website Anniversary

 

Great and Useful site!! Thanks

wa3gin

On Fri, Feb 7, 2025 at 2:29?PM Bill (Group Owner) via <k2wh=[email protected]> wrote:
Well believe it or not, its been 20 years, this site has been active and strong for Hallicrafters Radios.
?
Started in 2005 as a lark, I am amazed we now have 1,075 members.
?
With thanks to all our Hallicrafters Experts on this site and they are experts for sure.e
?
Regards, and have fun.

K2WH
Re: Website Anniversary

 

开云体育

Happy Anniversary?

Paul Bowman?
KC3FVD?


On Feb 7, 2025, at 2:29?PM, Bill (Group Owner) via groups.io <k2wh@...> wrote:

?
Well believe it or not, its been 20 years, this site has been active and strong for Hallicrafters Radios.
?
Started in 2005 as a lark, I am amazed we now have 1,075 members.
?
With thanks to all our Hallicrafters Experts on this site and they are experts for sure.e
?
Regards, and have fun.

K2WH
Re: Website Anniversary

 

Happy Anniversary!

????? ? Joe Connor

On Friday, February 7, 2025 at 02:29:23 PM EST, Bill (Group Owner) via groups.io <k2wh@...> wrote:


Well believe it or not, its been 20 years, this site has been active and strong for Hallicrafters Radios.
?
Started in 2005 as a lark, I am amazed we now have 1,075 members.
?
With thanks to all our Hallicrafters Experts on this site and they are experts for sure.e
?
Regards, and have fun.

K2WH
Website Anniversary

 
Edited

Well believe it or not, its been 20 years, this site has been active and strong for Hallicrafters Radios.
?
Started in 2005 as a lark, I am amazed that we now have 1,078 members.
?
With thanks to all our Hallicrafters Experts on this site and they are experts for sure.
?
Its been educational.
?
Regards, and have fun.

K2WH
Re: S-85 refurbish: I've got a problem during the RF alignment of bands 1 and 2 - trimcaps don't peak!

 

开云体育

Richard what does turning the dial clockwise ?actually mean? If it was a rotating pointer on a fixed scale it is fairly clear that the POINTER rotates CW. And the numbers stay fixed, but on a rotating scale with a fixed pointer, the physical scale might rotate CW but the values on the scale might be going up or down as you rotate. If they had a 1…100 scale ?one could just say turn it to position 1 or 100, but? I fear the use of CW,CCW with Rotating dials or Rotating scales ?can be confusing.?

?

the condition while attempting aligning is that there might just be too much capacitance.. obvious on two bands in 2 tanks each.

So now in this wonky situation, just to see what id going on. Ignore all that and try to get the tanks to resonate higher?? ?by ensuring the ?BS capacitor rotor itself is wide open. ?I thought Emanuele said he did that, but I’m not sure. ??

?

From: [email protected] [mailto:[email protected]] On Behalf Of Richard Knoppow via groups.io
Sent: Thursday, February 6, 2025 7:00 PM
To: [email protected]
Subject: Re: [HallicraftersRadios] S-85 refurbish: I've got a problem during the RF alignment of bands 1 and 2 - trimcaps don't peak!

?

Note that the direction of the dial and knob for bandspread are
reversed. See instructions about replacing the dial string. The index
mark on the dials is at the LOW end, with capacitors fully meshed. I
read this over carefully. The _band set_ position of the band spread is
with the dial at the high frequency end of each band, that is, capacitor
UN meshed. but the instructions for setting the dials is to fully mesh
the caps and use the index mark at the low end of both dials.
Also, a note states that the LO is at ABOVE the signal on all bands
except the highest (band 4) where it is below the signal (as I suspected).
The problem with clockwise and counter-clockwise is whether this is
the knob or dial direction, because they are opposite. However, looking
at the capacitor plates is unmistakable. Fully meshed for dial stringing
and setting the reference of the dials, band spread fully open when
setting the main dial for frequency and for alignment.

On 2/6/2025 2:25 PM, don Root wrote:

Richard you deleted my image in the reference so others might wonder
about some stuff missing, but no real matter there.

My thought to verify the bandspread is simply to turn the BS dial CW ?
and knob? ?CW and look at the BS capacitor meshing. It should be open!
??right? ?If somehow it is not it needs fixing first.

If it is ok, it’s back to square one. We will have to recruit a real expert.

Richard ?FYI only now:


--
Richard Knoppow
Los Angeles
WB6KBL
SKCC 19998

_._,_._,_


--
don??? va3drl
Re: S-85 refurbish: I've got a problem during the RF alignment of bands 1 and 2 - trimcaps don't peak!

 

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Emanuele, this is late.

Your statement here seems to eliminate the idea that the BS setting is the problem.

The other day while taking my truck tire off at a tire place, the hex part of the security nut shattered, leaving a small bit holding the wheel on and no way to get it loose.

Finally today a mechanic guy worked and worked and finally got it out. It takes persistence sometimes.

?

From: [email protected] [mailto:[email protected]] On Behalf Of Emanuele Girlando via groups.io
Sent: Thursday, February 6, 2025 5:21 PM
To: [email protected]
Subject: Re: [HallicraftersRadios] S-85 refurbish: I've got a problem during the RF alignment of bands 1 and 2 - trimcaps don't peak!

?

Richard, we do cross posted.

Today I also started to think the band spread variable capacitor was stringed reversed..

But I checked it and, in fully clockwise position (the one indicated for alignment), the cap is at minimal capacitance (blades all out).

?

Emanuele (IU1KNR).


--
don??? va3drl
Re: Missing page S2001A

 

?
Thanks Pete. I appreciate the complement.
?
I find it very gratifying that my work helps someone bring a piece of equipment back to life. It also provides me with the joyful option of bringing a possibly bug invested, stored in a garage or basement for 50 of 60 years into a worthwhile and useful document that others can read, use and enjoy.
?
Of course, one can find poorly scanned, incomplete, and highly marked up pages all over the Internet, but even when printed, crap is crap, and stuff is always lost in the transition.
?
I just finished a military manual for a customer. Roughly 200 pages but easy to do even though every page, because of age, was brown. My machine can remove background paper color. But the hicker and hard part, were the five schematics. They were 14 inches high and 52 inches wide. And I decided these were to be done full size. A customer never has to assemble and tape any of my manual pages.
?
This entire project started back in the mid 90's as a bonding project between father and son. Son was in his second high school year but didn't seem to have any idea about his future life endeavors. Since I was dragging boatanchors home to repair and get up and running,?from every hamfest I went to, my collection of manuals for this stuff started to become a pain to manage.? My son created database to manage all the manuals that I also kept collecting. He also suggested creating a catalog booklet, advertising in Electric Radio and a few other publications, and send out the catalog to all interested parties.? I firmly believe this gave him a sense of business activities and helped firm up (or at least give direction) to his future. He also created my first web site and credit him for giving it its name.
?
After? high school he worked for a year before applying and being accepted at Boston Bible College at Hyde Park, MA. He felt he should earn the money to pay for college rather then taking it for granted. For 3 summers while in his college years, he worked at Lucent Technologies as a contractor and used the money earned for tuition.
?
My apologies to the group for rambling, but I'm very proud of my son. I gave him a license manual when he was around seven. When he turned around 27, he finally found the time to become KB1JTP.
?
Pete, wa2cwa
?
?
?
On Thu, 6 Feb 2025 12:50:53 +0000 (UTC) "peteradio@... via groups.io" <peteradio@...> writes:

Pete,

As a loyal customer of yours, who has purchased numerous manuals from you,over the decades, I find your quality, pricing and delivery outstanding!

Keep up the good work and thanks for all the free advice you have provided,and continue to provide, to the amateur community regarding vintage gear!

73's

Pete

W8AA
Re: S-85 refurbish: I've got a problem during the RF alignment of bands 1 and 2 - trimcaps don't peak!

 

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Emmanuel ??Oh I sent? more cross-posting.

Now back at square one ?

Entropy is increasing quickly.

So you are back to the apparent ?too-much capacitance or inductance, and similar problem for 4 tank circuits.. strange…

?Emmanuel ?we don’t know the history so presumably this radio is new to you. did it ever work ok on band one? Is there a sign of somebody mucking about around the coils and bandswitch. Could there be a cross between band one and two tanks maybe due to little clearance?...another longshot

Now I am just wondering out loud, the RF for the 2 HF bands seem to use transformers with slugs, and you can see them on the layout, but for band 1,2 there are trimmers shown but no transformer or coil on the layout so perhaps “L3” has a simple winding for band 1 and another for band 2 ????? same situation and question for the mixer tanks? So what would happen if L3 had a common ground connection terminal and a bad connection to ground ? OR something? ??could L3 have been changed ?another longshot

Another thought; I wonder if the alignment instructions are as complete as for older radios.? My thought is that both ends of the oscillator should be set first and any interaction eliminated by repeating the C22 and C25 ?adjustments etc, then set the RF trimmers. It is hard to see it making a big difference… Richard, Emanule, whoever??

A last resort might be to? find the resonant point of each tank at the top end and the bottom end of the main tuning for bands 1 and then 2. ????

Richard has just added some confusion so this is going now as-is only thoughts.

?

From: [email protected] [mailto:[email protected]] On Behalf Of Emanuele Girlando via groups.io
Sent: Thursday, February 6, 2025 5:21 PM
To: [email protected]
Subject: Re: [HallicraftersRadios] S-85 refurbish: I've got a problem during the RF alignment of bands 1 and 2 - trimcaps don't peak!

?

Richard, we do cross posted.

Today I also started to think the band spread variable capacitor was stringed reversed..

But I checked it and, in fully clockwise position (the one indicated for alignment), the cap is at minimal capacitance (blades all out).

?

Emanuele (IU1KNR).

_._,_._,_


--
don??? va3drl
Re: S-85 refurbish: I've got a problem during the RF alignment of bands 1 and 2 - trimcaps don't peak!

 

Note that the direction of the dial and knob for bandspread are
reversed. See instructions about replacing the dial string. The index
mark on the dials is at the LOW end, with capacitors fully meshed. I
read this over carefully. The _band set_ position of the band spread is
with the dial at the high frequency end of each band, that is, capacitor
UN meshed. but the instructions for setting the dials is to fully mesh
the caps and use the index mark at the low end of both dials.
Also, a note states that the LO is at ABOVE the signal on all bands
except the highest (band 4) where it is below the signal (as I suspected).
The problem with clockwise and counter-clockwise is whether this is
the knob or dial direction, because they are opposite. However, looking
at the capacitor plates is unmistakable. Fully meshed for dial stringing
and setting the reference of the dials, band spread fully open when
setting the main dial for frequency and for alignment.


On 2/6/2025 2:25 PM, don Root wrote:
Richard you deleted my image in the reference so others might wonder
about some stuff missing, but no real matter there.

My thought to verify the bandspread is simply to turn the BS dial CW ?
and knob? ?CW and look at the BS capacitor meshing. It should be open!
??right? ?If somehow it is not it needs fixing first.

If it is ok, it’s back to square one. We will have to recruit a real expert.

Richard ?FYI only now:

--
Richard Knoppow
Los Angeles
WB6KBL
SKCC 19998
Re: S-85 refurbish: I've got a problem during the RF alignment of bands 1 and 2 - trimcaps don't peak!

 

Where its supposed to be I think.
As far as your last post, I was looking for something like this. I
was tempted to suggest getting rid of the high tech instruments and
sticking to a regular signal generator as prescribed in the
instructions. This is really a very simple receiver and should be easy
to align. Remove as many variables as possible, such as a spectrum
analyzer and sweeper. Maybe after doing an alignment with the simplest
tools. A modern signal generator will have reasonable calibration
accuracy for both frequency and output level. A counter or even just a
crystal calibrator will do for adjusting dial calibration. The spectrum
analyzer is helpful for signal tracing, if necessary, and to determine
which side of the local oscillator the signal is on. On the broadcast
band its possible that if you are on the wrong side (will be below the
signal) you will simply run out of range at the low end. That could be
what is wrong. Actually, a simple broadcast receiver should hear the LO
and tell you where it is. Should be the signal frequency plus 455Khz.
Obviously, if its tuning below the signal it will probably stop
oscillating at some point. At the lowest frequency of the broadcast
band, usually 535 Khz, the LO would have to be at 80Khz. Might be the
reason it stops working at about mid band. Again, its likely the top
band is opposite of the others, i.e. the LO will be below the signal.
This is often the case in older multi-band receivers because the
oscillator/mixer may have higher conversion gain there. Depends on the
tube used. Unfortunately, handbooks often don't tell you this. The
assumption being the tuning will be only touch up and not far from the
factory settings. We are dealing with antiques and some of the
assumptions made by the manufacturer are simply not so.
Good luck, I think you are on your way.


On 2/6/2025 2:20 PM, Emanuele Girlando via groups.io wrote:
Richard, we do cross posted.
Today I also started to think the band spread variable capacitor was
stringed reversed..
But I checked it and, in fully clockwise position (the one indicated for
alignment), the cap is at minimal capacitance (blades all out).
Emanuele (IU1KNR).
<>

--
Richard Knoppow
Los Angeles
WB6KBL
SKCC 19998
Re: S-85 refurbish: I've got a problem during the RF alignment of bands 1 and 2 - trimcaps don't peak!

 
Edited

开云体育

Richard you deleted my image in the reference so others might wonder about some stuff missing, but no real matter there.

My thought to verify the bandspread is simply to turn the BS dial CW ? and knob? ?CW and look at the BS capacitor meshing. It should be open! ??right? ?If somehow it is not it needs fixing first.

?

If it is ok, it’s back to square one. We will have to recruit a real expert.

?

Richard ?FYI only now:

From: [email protected] [mailto:[email protected]] On Behalf Of Richard Knoppow via groups.io
Sent: Thursday, February 6, 2025 4:33 PM
To: [email protected]
Subject: Re: [HallicraftersRadios] S-85 refurbish: I've got a problem during the RF alignment of bands 1 and 2 - trimcaps don't peak!

?

Which way is the band spread capacitor facing? Capacitance should
be minimum with dial at zero. This is Halicrafters design, on
non-calibrated band spreads the dial indicates the amount of capitance.
I think calibrated dials are set for the logging scale to be the same
but in any case the band set is generally at the high end of the band.
The dial cord is backwards of its orientation on later receivers
like the S-40. The string crosses over.
BTW, I wondered about this. My S-40A came with the band spread
string reversed and stop peg facing the opposite way to that shown in
the handbooks. I reversed it. In its original position the band spread
went from zero to 100 but in what I thought was the correct position it
stops at about 95. Same for the S-20R. It made me wonder if the original
position was correct and there is a global error in the handbooks for
all this series of receivers. The position as shown in the S-85 handbook
seems to confirm this. A puzzle. At some point I will try reversing the
cable in both receivers. In any case, at ZERO the band spread is at
minimum band spread capacitance, plates turned out from stator, this is
as it should be regardless of the cord.


--
don??? va3drl
Re: S-85 refurbish: I've got a problem during the RF alignment of bands 1 and 2 - trimcaps don't peak!

 

Richard, we do cross posted.
Today I also started to think the band spread variable capacitor was stringed reversed..
But I checked it and, in fully clockwise position (the one indicated for alignment), the cap is at minimal capacitance (blades all out).
?
Emanuele (IU1KNR).
Re: S-85 refurbish: I've got a problem during the RF alignment of bands 1 and 2 - trimcaps don't peak!

 
Edited

Wait a minute guys ... SORRY guys!!!!!
?
Using the SA for RF alignment led me astray, .. and you all with me!
Don, you say need education ... from my side I would say I need a medical treatment for my brain!!
?
We are not looking for the peak at the resonant frequency, as you would do aligning an IF, but we are looking for the MAX at the indicated frequencies. Operating this way the? entire response curve of the band takes on an ideal shape and the peak will be placed approximately in the middle.
?
This picture sketches what I mean...
?
Looking that happenin in real time makes things much more clear.
This also explains why the radio is performing well.
?
Still, band 1 & 2 won't get to a MAX at the indicated frequencies.
Releasing the TRIMCAPs from fully tight to fully released the signal (and the entire curve with it) goes always up and never down until the TRIMCAP reaches its end stop.
I would say: they go to "highest possible value"...
?
Emanuele (IU1KNR).
?
Re: S-85 refurbish: I've got a problem during the RF alignment of bands 1 and 2 - trimcaps don't peak!

 

Which way is the band spread capacitor facing? Capacitance should
be minimum with dial at zero. This is Halicrafters design, on
non-calibrated band spreads the dial indicates the amount of capitance.
I think calibrated dials are set for the logging scale to be the same
but in any case the band set is generally at the high end of the band.
The dial cord is backwards of its orientation on later receivers
like the S-40. The string crosses over.
BTW, I wondered about this. My S-40A came with the band spread
string reversed and stop peg facing the opposite way to that shown in
the handbooks. I reversed it. In its original position the band spread
went from zero to 100 but in what I thought was the correct position it
stops at about 95. Same for the S-20R. It made me wonder if the original
position was correct and there is a global error in the handbooks for
all this series of receivers. The position as shown in the S-85 handbook
seems to confirm this. A puzzle. At some point I will try reversing the
cable in both receivers. In any case, at ZERO the band spread is at
minimum band spread capacitance, plates turned out from stator, this is
as it should be regardless of the cord.


On 2/6/2025 1:13 PM, don Root wrote:
Emanuele

I NEED EDUCATION ?on reading these new scopes and such

Wrt your previous post; I have no reason to believe there is a problem
in the IF.

My last post made wrong assumptions on the reading the scope, so my
conclusions are wrong; and I agree the RF tuning on the first tank in
band 1? is way out it seems.

I keep wondering why 4 tanks seem to have the same problem. ?Is it
possible that the bandspread dial stringing is reversed?

*From:*[email protected]
[mailto:[email protected]] *On Behalf Of *Emanuele Girlando
via groups.io
*Sent:* Thursday, February 6, 2025 4:25 AM
*To:* [email protected]
*Subject:* Re: [HallicraftersRadios] S-85 refurbish: I've got a problem
during the RF alignment of bands 1 and 2 - trimcaps don't peak!

Don,

here is my picture interpretation:

Richard:

·"/So, what is this about .5Mhz and /*/370/*/and /*/220/*/Khz?/ ". Those
are the delta values between peak and the desired frequency as reported
by the Delta marker (rounded).

·The IF alignment has been remade from scratch by using the "visual"
approach (first 3 pictures).

·"/The position of the peaks on the RF will be affected somewhat by the
dummy load/". If you meant the "dummy antenna" *I fully agree*. I'm
gonna try the same test removing the dummy antenna from the equation.
I'll report as soon as I get time to work on that.

Correction to my previous post:

"/...all signals (and the noise as well) tend to disappear below /
*/.5MHz/*" should read "... below *1MHz*" that is in the lower half of
the band.

Thank you guys!

Emanuele (IU1KNR).
<>


--
don??? va3drl
--
Richard Knoppow
Los Angeles
WB6KBL
SKCC 19998
Re: S-85 refurbish: I've got a problem during the RF alignment of bands 1 and 2 - trimcaps don't peak!

 
Edited

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Emanuele

I NEED EDUCATION ?on reading these new scopes and such

Wrt your previous post; I have no reason to believe there is a problem in the IF.

My last post made wrong assumptions on the reading the scope, so my conclusions are wrong; and I agree the RF tuning on the first tank in band 1? is way out it seems.

I keep wondering why 4 tanks seem to have the same problem. ?Is it possible that the bandspread dial stringing is reversed?

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From: [email protected] [mailto:[email protected]] On Behalf Of Emanuele Girlando via groups.io
Sent: Thursday, February 6, 2025 4:25 AM
To: [email protected]
Subject: Re: [HallicraftersRadios] S-85 refurbish: I've got a problem during the RF alignment of bands 1 and 2 - trimcaps don't peak!

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Don,

here is my picture interpretation:

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Richard:

·?????? "So, what is this about .5Mhz and 370 and 220 Khz? ". Those are the delta values between peak and the desired frequency as reported by the Delta marker (rounded).

·?????? The IF alignment has been remade from scratch by using the "visual" approach (first 3 pictures).

·?????? "The position of the peaks on the RF will be affected somewhat by the dummy load". If you meant the "dummy antenna" I fully agree. I'm gonna try the same test removing the dummy antenna from the equation. I'll report as soon as I get time to work on that.

Correction to my previous post:

"...all signals (and the noise as well) tend to disappear below .5MHz" should read "... below 1MHz" that is in the lower half of the band.

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Thank you guys!

Emanuele (IU1KNR).

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--
don??? va3drl
Re: S-85 refurbish: I've got a problem during the RF alignment of bands 1 and 2 - trimcaps don't peak!

 

Hy.
I can confirm that the dummy antenna is not influencing the peaks points.
I tried the tests just getting the TG output physically close to the antenna connector and nothing changed but the vertical values..
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Emanuele (IU1KNR).
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