|
Here's a question
that is of general interest to me.? What was the first and last
Hallicrafters radio (Receiver or Transceiver) that had a flywheel
incorporated into the main frequency tuning?? I do recall in High
school our SX-28 indeed had it.? My SX-115 has it (matching HT-32B
too).? Did any of the SR series transceivers or later SX-receivers
have a flywheel hidden inside?
73
Don N9OO
|
Not the first, or the last, but my SX-42 sure has it.?
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Show quoted text
On Apr 26, 2025, at 8:37?AM, Don Buska - The Radio Lab Works <don@...> wrote:
?
Here's a question
that is of general interest to me.? What was the first and last
Hallicrafters radio (Receiver or Transceiver) that had a flywheel
incorporated into the main frequency tuning?? I do recall in High
school our SX-28 indeed had it.? My SX-115 has it (matching HT-32B
too).? Did any of the SR series transceivers or later SX-receivers
have a flywheel hidden inside?
73
Don N9OO
|
Weighted flywheel tuning on my SX-25 and S-40a main tuning but not bandspread. ?SX-100 has weighted flywheel tuning on both main and bandspread. ?
No weighted tuning on my SR-400A, nor the matching VFO.?
Paul, W9AC.?
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Not the first, or the last, but my SX-42 sure has it.?
On Apr 26, 2025, at 8:37?AM, Don Buska - The Radio Lab Works <don@...> wrote:
? Here's a question that is of general interest to me.? What was the first and last Hallicrafters radio (Receiver or Transceiver) that had a flywheel incorporated into the main frequency tuning??
I do recall in High school our SX-28 indeed had it.? My SX-115 has it (matching HT-32B too).? Did any of the SR series transceivers or later SX-receivers have a flywheel hidden inside?
73
Don N9OO
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Thanks Paul,? I was wondering about the last of the SR-line.? So I
guess once Hallicrafters went to the 'lighter' rig trend in the
1960's, no more Battle Ships, the flywheel was probably cast away.?
I assume they went to clutch friction driving of the Kc, 100Kc and
VFO capacitor on the SR-400A.? I've been working on the restoration
of my SR-150 this past month and was kind of disappointed in the
smoothness of slow tuning of the VFO, due to the friction clutch
drive.? It tunes smoothly at the fast rate, but when your slowly
working your way up or down you can feel the extra drag.? And I have
cleaned the friction plates and drive disks.? I also lubed the brass
bushing and VFO cap bearing as well.? Outside of completely removing
the front panel and disassembling everything, I'm not to sure how
good it can get.?? I'll need to test drive a few SR-400's and their
lessor brothers to get a better feel I guess.
Thanks es 73
Don N9OO
On 4/26/25 9:01 AM, Paul Christensen
via groups.io wrote:
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Weighted flywheel tuning on my SX-25 and S-40a main
tuning but not bandspread. ?SX-100 has weighted flywheel tuning
on both main and bandspread. ?
No weighted tuning on my SR-400A, nor the matching
VFO.?
Paul, W9AC.?
|
The SR series did not use cord drive. It is direct drive. The ht-44 and the SX-117 and others were also direct drive.
Walt Cates, WD0GOF
?
A majority of acceptance is not proof of correctness.
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Thanks Paul,? I was wondering about the last of the SR-line.? So I guess once Hallicrafters went to the 'lighter' rig trend in the 1960's, no more Battle Ships, the flywheel was probably cast away.? I assume they went to clutch friction driving of the
Kc, 100Kc and VFO capacitor on the SR-400A.? I've been working on the restoration of my SR-150 this past month and was kind of disappointed in the smoothness of slow tuning of the VFO, due to the friction clutch drive.? It tunes smoothly at the fast rate,
but when your slowly working your way up or down you can feel the extra drag.? And I have cleaned the friction plates and drive disks.? I also lubed the brass bushing and VFO cap bearing as well.? Outside of completely removing the front panel and disassembling
everything, I'm not to sure how good it can get.?? I'll need to test drive a few SR-400's and their lessor brothers to get a better feel I guess.
Thanks es 73
Don N9OO
On 4/26/25 9:01 AM, Paul Christensen via groups.io wrote:
Weighted flywheel tuning on my SX-25 and S-40a main tuning but not bandspread. ?SX-100 has weighted flywheel tuning on both main and bandspread. ?
No weighted tuning on my SR-400A, nor the matching VFO.?
Paul, W9AC.?
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Also consider the SR series were billed as mobile rigs and you would not want a weighted free wheeling tuning in that application.
Ed, WA9GQK
On Saturday, April 26, 2025 at 09:41:46 AM CDT, Don Buska - The Radio Lab Works <don@...> wrote:
Thanks Paul,? I was wondering about the last of the SR-line.? So I
guess once Hallicrafters went to the 'lighter' rig trend in the
1960's, no more Battle Ships, the flywheel was probably cast away.?
I assume they went to clutch friction driving of the Kc, 100Kc and
VFO capacitor on the SR-400A.? I've been working on the restoration
of my SR-150 this past month and was kind of disappointed in the
smoothness of slow tuning of the VFO, due to the friction clutch
drive.? It tunes smoothly at the fast rate, but when your slowly
working your way up or down you can feel the extra drag.? And I have
cleaned the friction plates and drive disks.? I also lubed the brass
bushing and VFO cap bearing as well.? Outside of completely removing
the front panel and disassembling everything, I'm not to sure how
good it can get.?? I'll need to test drive a few SR-400's and their
lessor brothers to get a better feel I guess.
Thanks es 73
Don N9OO
On 4/26/25 9:01 AM, Paul Christensen
via groups.io wrote:
Weighted flywheel tuning on my SX-25 and S-40a main
tuning but not bandspread. ?SX-100 has weighted flywheel tuning
on both main and bandspread. ?
No weighted tuning on my SR-400A, nor the matching
VFO.?
Paul, W9AC.?
|
My S 20R has one also, made in 1942, was at Camp Pendelton at the NCO club.
On Sat, Apr 26, 2025 at 08:49 Arthur Smith via <arthurredsox= [email protected]> wrote: Not the first, or the last, but my SX-42 sure has it.?
On Apr 26, 2025, at 8:37?AM, Don Buska - The Radio Lab Works <don@...> wrote:
?
Here's a question
that is of general interest to me.? What was the first and last
Hallicrafters radio (Receiver or Transceiver) that had a flywheel
incorporated into the main frequency tuning?? I do recall in High
school our SX-28 indeed had it.? My SX-115 has it (matching HT-32B
too).? Did any of the SR series transceivers or later SX-receivers
have a flywheel hidden inside?
73
Don N9OO
|
Good point Ed, thanks.
73 Don N9OO
On 4/26/25 11:22, edward schumacher
wrote:
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Also consider the SR series
were billed as mobile rigs and you would not want a weighted
free wheeling tuning in that application.
Ed, WA9GQK
On Saturday, April 26, 2025 at 09:41:46 AM CDT, Don
Buska - The Radio Lab Works <don@...>
wrote:
Thanks Paul,? I was wondering about the last of the
SR-line.? So I guess once Hallicrafters went to the
'lighter' rig trend in the 1960's, no more Battle Ships,
the flywheel was probably cast away.? I assume they went
to clutch friction driving of the Kc, 100Kc and VFO
capacitor on the SR-400A.? I've been working on the
restoration of my SR-150 this past month and was kind of
disappointed in the smoothness of slow tuning of the
VFO, due to the friction clutch drive.? It tunes
smoothly at the fast rate, but when your slowly working
your way up or down you can feel the extra drag.? And I
have cleaned the friction plates and drive disks.? I
also lubed the brass bushing and VFO cap bearing as
well.? Outside of completely removing the front panel
and disassembling everything, I'm not to sure how good
it can get.?? I'll need to test drive a few SR-400's and
their lessor brothers to get a better feel I guess.
Thanks es 73
Don N9OO
On
4/26/25 9:01 AM, Paul Christensen via groups.io wrote:
Weighted flywheel tuning on my SX-25 and
S-40a main tuning but not bandspread. ?SX-100 has
weighted flywheel tuning on both main and bandspread.
?
No weighted tuning on my SR-400A, nor the
matching VFO.?
Paul, W9AC.?
|
My S-20r and S-40A? have flywheels on the band spread. It's possible that some receivers have flywheels on the main tuning but I can't think of any hallicrafters that? do. Also, flywheels are found on some direct drive dials, not just strring drive.? ? An interesting? i think flywheels were more more sales gimmicks than practical? devices.
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-------- Original message -------- From: "John Watkins via groups.io" <jpwatkins9@...> Date: 4/26/25 9:28 AM (GMT-08:00) Subject: Re: [HallicraftersRadios] The First and Last Hallicrafters with Flywheel tuning?
My S 20R has one also, made in 1942, was at Camp Pendelton at the NCO club. On Sat, Apr 26, 2025 at 08:49 Arthur Smith via <arthurredsox= [email protected]> wrote: Not the first, or the last, but my SX-42 sure has it.?
 On Apr 26, 2025, at 8:37?AM, Don Buska - The Radio Lab Works <don@...> wrote:
?
Here's a question
that is of general interest to me.? What was the first and last
Hallicrafters radio (Receiver or Transceiver) that had a flywheel
incorporated into the main frequency tuning?? I do recall in High
school our SX-28 indeed had it.? My SX-115 has it (matching HT-32B
too).? Did any of the SR series transceivers or later SX-receivers
have a flywheel hidden inside?
73
Don N9OO
|
Humphrey Bogart as an exec with an SX 42 in his office. Movie title Sabrina co-starring Audrey Hepburn.?
On Sat, Apr 26, 2025 at 5:37?AM Don Buska - The Radio Lab Works via <don= [email protected]> wrote:
Here's a question
that is of general interest to me.? What was the first and last
Hallicrafters radio (Receiver or Transceiver) that had a flywheel
incorporated into the main frequency tuning?? I do recall in High
school our SX-28 indeed had it.? My SX-115 has it (matching HT-32B
too).? Did any of the SR series transceivers or later SX-receivers
have a flywheel hidden inside?
73
Don N9OO
--
AF6IM
www.parachutemobile.com
|
Good afternoon The SX-96 has a flywheel also
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On Apr 26, 2025, at 2:08 PM, Richard Knoppow via < 1oldlens1@...> wrote:
My S-20r and S-40A? have flywheels on the band spread. It's possible that some receivers have flywheels on the main tuning but I can't think of any hallicrafters that? do. Also, flywheels are found on some direct drive dials, not just strring drive.? ? An interesting? i think flywheels were more more sales gimmicks than practical? devices.
-------- Original message -------- Date: 4/26/25 9:28 AM (GMT-08:00) Subject: Re: [HallicraftersRadios] The First and Last Hallicrafters with Flywheel tuning?
My S 20R has one also, made in 1942, was at Camp Pendelton at the NCO club. On Sat, Apr 26, 2025 at 08:49 Arthur Smith via <arthurredsox= [email protected]> wrote: Not the first, or the last, but my SX-42 sure has it.?
<image0.jpeg>On Apr 26, 2025, at 8:37?AM, Don Buska - The Radio Lab Works <don@...> wrote:
?
Here's a question
that is of general interest to me.? What was the first and last
Hallicrafters radio (Receiver or Transceiver) that had a flywheel
incorporated into the main frequency tuning?? I do recall in High
school our SX-28 indeed had it.? My SX-115 has it (matching HT-32B
too).? Did any of the SR series transceivers or later SX-receivers
have a flywheel hidden inside?
73
Don N9OO
|
Richard, it seems to me for older receivers, while tuning across a ham band the weight is not helpful, but when tuning from end to end or the whole dial, it is helpful. So what weight is the best ? zero or 100 ? PS? is “direct drive” always DIRECT on the cap rotor shaft, or is it geared usually? ?
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From: [email protected] [mailto:[email protected]] On Behalf Of Richard Knoppow via groups.io
Sent: Saturday, April 26, 2025 4:09 PM
To: [email protected]
Subject: Re: [HallicraftersRadios] The First and Last Hallicrafters with Flywheel tuning?? My S-20r and S-40A? have flywheels on the band spread. It's possible that some receivers have flywheels on the main tuning but I can't think of any hallicrafters that? do. Also, flywheels are found on some direct drive dials, not just strring drive.? ? An interesting? i think flywheels were more more sales gimmicks than practical? devices. -------- Original message -------- From: "John Watkins via groups.io" <jpwatkins9@...> Date: 4/26/25 9:28 AM (GMT-08:00) Subject: Re: [HallicraftersRadios] The First and Last Hallicrafters with Flywheel tuning? My S 20R has one also, made in 1942, was at Camp Pendelton at the NCO club. ? On Sat, Apr 26, 2025 at 08:49 Arthur Smith via <arthurredsox=[email protected]> wrote: Not the first, or the last, but my SX-42 sure has it.? ………pic removed…. On Apr 26, 2025, at 8:37?AM, Don Buska - The Radio Lab Works <don@...> wrote: ? Here's a question that is of general interest to me.? What was the first and last Hallicrafters radio (Receiver or Transceiver) that had a flywheel incorporated into the main frequency tuning?? I do recall in High school our SX-28 indeed had it.? My SX-115 has it (matching HT-32B too).? Did any of the SR series transceivers or later SX-receivers have a flywheel hidden inside?
73
Don N9OO
-- don??? va3drl
|
That sure is a nice looking SX42! Thanks for the pic!
John K5MO
On Sat, Apr 26, 2025 at 9:49?AM Arthur Smith via <arthurredsox= [email protected]> wrote: Not the first, or the last, but my SX-42 sure has it.?
On Apr 26, 2025, at 8:37?AM, Don Buska - The Radio Lab Works <don@...> wrote:
?
Here's a question
that is of general interest to me.? What was the first and last
Hallicrafters radio (Receiver or Transceiver) that had a flywheel
incorporated into the main frequency tuning?? I do recall in High
school our SX-28 indeed had it.? My SX-115 has it (matching HT-32B
too).? Did any of the SR series transceivers or later SX-receivers
have a flywheel hidden inside?
73
Don N9OO
|
The sx-146 has flywheel tuning. It might not be the last, but must be close.?
?
73 Kevin w9cf
|
Thanks Kevin.?
You may be correct since that receiver was made up until 1969.?
How does the tuning feel on that receiver?? Do you get some
sustained spin movement with a flick of the wrist?
73
Don N9OO
On 4/27/25 12:33 AM, Kevin W9CF via
groups.io wrote:
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The sx-146 has flywheel tuning. It might not be the last, but
must be close.?
?
73 Kevin w9cf
|
My SX-17 has direct tuning and a fly wheel.
?
K2WH
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My SX-146 has been on a shelf in a box in the garage for the last 10 years or more. My memory is that it has a bit of sustained movement, but doesn't go end to end, or anything like that. It does give it a decent feel. I should probably get that HT-46, SX-146, vox unit, etc. out of storage and find them a better home. That SX-146 has all three filters and calibrator, but the previous original owner pried off the Hallicrafters tuning knob and substituted a bigger national knob, so it looks a bit odd...
?
73 Kevin w9cf
|
Kevin w9cf contact me at? cateswa at msn.com.
Walt Cates, WD0GOF
?
A majority of acceptance is not proof of correctness.
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My SX-146 has been on a shelf in a box in the garage for the last 10 years or more. My memory is that it has a bit of sustained movement, but doesn't go end to end, or anything like that. It does give it a decent feel. I should probably get that HT-46,
SX-146, vox unit, etc. out of storage and find them a better home. That SX-146 has all three filters and calibrator, but the previous original owner pried off the Hallicrafters tuning knob and substituted a bigger national knob, so it looks a bit odd...
?
73 Kevin w9cf
|
There ete all sorts of variations of dial drives. For instance rhe Hammarlund SP 600 JX uses a gear reduction driven by a friction drive on the dial, it also has a flywheel. While it has both a main dial and band spread dial they are driven together. It is an extremely smooth drive.? In comparison, thr RCA AR 88 also has two dials which are driven together via gears but the main shaft is gear coupled to the dial mechanism, no friction drive. It also has a flywheel.? This is also a very smooth drive although the SP 600 is smoother.?
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-------- Original message -------- From: "Bill (Group Owner) via groups.io" <k2wh@...> Date: 4/27/25 12:46 PM (GMT-08:00) Subject: Re: [HallicraftersRadios] The First and Last Hallicrafters with Flywheel tuning?
My SX-17 has direct tuning via a fly wheel.
?
K2WH
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Thanks Bill.?
Well that gets us to the current oldest honor of 1937.
73 - Don N9OO
On 4/27/25 2:46 PM, Bill (Group Owner)
via groups.io wrote:
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My SX-17 has direct tuning via a fly wheel.
?
K2WH
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Don Buska - The Radio Lab Works
Paul Christensen
waltcates
don Root
Bill (Group Owner)