Paul
I have not read the other suggestions, but two come to mind
1. Can you unground one side of the AC for heaters.? Normally it is a twisted pair.? I used a bridge to pull down the heater voltage on a R4C from 7.0 to 6.5. (It had forfeited some tubes for transistors)
2. There are very cheap DC to DC converters (sometimes called regulators or step up or step down (buck) but are adjustable for output voltage) from China on the internet, for $5.? So rectify your heater voltage - half wave may be OK.? The two sides of the converter are electrically isolated.
I used one also on a drake R2C using a replacement mains transformer that did not have a 12.6V output.? So boosted from 6.3V.? If there is interference put the ferrite beads on the wires.
Nigel
On Thu, Jan 18, 2024 at 8:09?PM Jim Shorney < jimNU0C@...> wrote:
Even better, use a 317T regulator *with recommended external caps*. Better specs and you can set the voltage to exactly what you want.
73
-Jim
NU0C
On Thu, 18 Jan 2024 11:52:15 -0800
"jerry-KF6VB" <jerry@...> wrote:
> On 2024-01-18 11:17, Paul Christensen wrote:
> > I'll soon be installing a K4DPK VFO stabilizer in my TR-4Cw.? The
> > stabilizer works on 10-14 VDC.? Since there's no low voltage in the
> > TR-4Cw, I'm curious how others have attempted the supply voltage
> > dilemma,?
>
> *** I had a similar requirement for my KWM-2.? I used a half-wave
> rectifier
> off the filament circuit, feeding a TO-92 three-terminal regulator.?
> Which
> has far better ripple rejection than a zener diode.
>
> Actually, I wound up using two half-wave rectifier circuits;? one for
> a BHI noise reduction module inserted in the audio stream, and the other
> for a DC fan.
>
>? ? In the case of the KWM2, there was an empty tube socket on the
> chassis,
> meant for a noise blanker option.? This had most of the signals I
> needed,
> including a switch closure for the "NB" position on the front panel.? So
> now when I click to "NB", the band noise goes down.? I mostly leave it
> in
> "NB".
>
>? ? ? ? ? ? ? ? ? ?- Jerry, KF6VB
>
>
>
>
>
--
73
-Jim
NU0C
|
Jim,
I don't believe the 317T is a low-drop-out regulator. There won't be much
In-Out margin on the 12.6 VAC string during a brown-out condition with
half-wave rectification. It also requires (or strongly suggested by the
OEMs) use of protection diodes across the I/O terminals and output.
Considering the low current draw and wide supply range of the K4DPK
stabilizer, 78L10 or 78L12 should be sufficient.
Paul, W9AC
toggle quoted message
Show quoted text
-----Original Message----- From: [email protected] < [email protected]> On Behalf Of Jim Shorney Sent: Thursday, January 18, 2024 3:10 PM To: [email protected]Subject: Re: [DRAKE-RADIO] K4DPK VFO Stabilizer Even better, use a 317T regulator *with recommended external caps*. Better specs and you can set the voltage to exactly what you want. 73 -Jim NU0C On Thu, 18 Jan 2024 11:52:15 -0800 "jerry-KF6VB" <jerry@...> wrote: On 2024-01-18 11:17, Paul Christensen wrote:
I'll soon be installing a K4DPK VFO stabilizer in my TR-4Cw. The
stabilizer works on 10-14 VDC. Since there's no low voltage in the
TR-4Cw, I'm curious how others have attempted the supply voltage
dilemma, *** I had a similar requirement for my KWM-2. I used a half-wave
rectifier off the filament circuit, feeding a TO-92 three-terminal
regulator.
Which
has far better ripple rejection than a zener diode.
Actually, I wound up using two half-wave rectifier circuits; one for
a BHI noise reduction module inserted in the audio stream, and the
other for a DC fan.
In the case of the KWM2, there was an empty tube socket on the
chassis, meant for a noise blanker option. This had most of the
signals I needed, including a switch closure for the "NB" position on
the front panel. So now when I click to "NB", the band noise goes
down. I mostly leave it in "NB".
- Jerry, KF6VB
-- 73 -Jim NU0C
|
On 2024-01-18 12:06, Paul Christensen wrote: Jerry,
You probably used a 78L12? *** That sounds about right. And now that I remember, I used a 1/2 wave voltage doubler running off the 6.3VAC. - Jerry, KF6VB
|
Re: TR7 fails to PLL when turned on
Check the RV7 Jones plug and socket, front panel Fixed buttons, and "Molexia" on the other boards. 73 -Jim NU0C On Thu, 18 Jan 2024 11:54:01 -0800 "K6OXN Bob" <bobk6oxn@...> wrote: My TR7 even with an NRV7 fails to lock the displayed freq when turned on. Have to cycle the on/off a few times or cycle the AUX7 switch. I have cleaned and checked all connections to the DR7 and on the AUX switch and ON/OFF without any luck.? Any other suggestions.
73? Bob
-- 73 -Jim NU0C
|
Even better, use a 317T regulator *with recommended external caps*. Better specs and you can set the voltage to exactly what you want. 73 -Jim NU0C On Thu, 18 Jan 2024 11:52:15 -0800 "jerry-KF6VB" <jerry@...> wrote: On 2024-01-18 11:17, Paul Christensen wrote:
I'll soon be installing a K4DPK VFO stabilizer in my TR-4Cw. The
stabilizer works on 10-14 VDC. Since there's no low voltage in the
TR-4Cw, I'm curious how others have attempted the supply voltage
dilemma, *** I had a similar requirement for my KWM-2. I used a half-wave
rectifier
off the filament circuit, feeding a TO-92 three-terminal regulator.
Which
has far better ripple rejection than a zener diode.
Actually, I wound up using two half-wave rectifier circuits; one for
a BHI noise reduction module inserted in the audio stream, and the other
for a DC fan.
In the case of the KWM2, there was an empty tube socket on the
chassis,
meant for a noise blanker option. This had most of the signals I
needed,
including a switch closure for the "NB" position on the front panel. So
now when I click to "NB", the band noise goes down. I mostly leave it
in
"NB".
- Jerry, KF6VB
-- 73 -Jim NU0C
|
Jerry,
You probably used a 78L12?
Paul, W9AC
toggle quoted message
Show quoted text
-----Original Message----- From: [email protected] < [email protected]> On Behalf Of jerry-KF6VB Sent: Thursday, January 18, 2024 2:52 PM To: [email protected]Subject: Re: [DRAKE-RADIO] K4DPK VFO Stabilizer On 2024-01-18 11:17, Paul Christensen wrote: I'll soon be installing a K4DPK VFO stabilizer in my TR-4Cw. The
stabilizer works on 10-14 VDC. Since there's no low voltage in the
TR-4Cw, I'm curious how others have attempted the supply voltage
dilemma, *** I had a similar requirement for my KWM-2. I used a half-wave rectifier off the filament circuit, feeding a TO-92 three-terminal regulator. Which has far better ripple rejection than a zener diode. Actually, I wound up using two half-wave rectifier circuits; one for a BHI noise reduction module inserted in the audio stream, and the other for a DC fan. In the case of the KWM2, there was an empty tube socket on the chassis, meant for a noise blanker option. This had most of the signals I needed, including a switch closure for the "NB" position on the front panel. So now when I click to "NB", the band noise goes down. I mostly leave it in "NB". - Jerry, KF6VB
|
TR7 fails to PLL when turned on
My TR7 even with an NRV7 fails to lock the displayed freq when turned on. Have to cycle the on/off a few times or cycle the AUX7 switch. I have cleaned and checked all connections to the DR7 and on the AUX switch and ON/OFF without any luck.? Any other suggestions.
73? Bob
|
On 2024-01-18 11:17, Paul Christensen wrote: I'll soon be installing a K4DPK VFO stabilizer in my TR-4Cw. The
stabilizer works on 10-14 VDC. Since there's no low voltage in the
TR-4Cw, I'm curious how others have attempted the supply voltage
dilemma, *** I had a similar requirement for my KWM-2. I used a half-wave rectifier off the filament circuit, feeding a TO-92 three-terminal regulator. Which has far better ripple rejection than a zener diode. Actually, I wound up using two half-wave rectifier circuits; one for a BHI noise reduction module inserted in the audio stream, and the other for a DC fan. In the case of the KWM2, there was an empty tube socket on the chassis, meant for a noise blanker option. This had most of the signals I needed, including a switch closure for the "NB" position on the front panel. So now when I click to "NB", the band noise goes down. I mostly leave it in "NB". - Jerry, KF6VB
|
I¡¯ll soon be installing a K4DPK VFO stabilizer in my TR-4Cw.? The stabilizer works on 10-14 VDC.? Since there¡¯s no low voltage in the TR-4Cw, I¡¯m curious how others have attempted the supply voltage dilemma,.? Here are some options: ? - Use the 12.6VAC filament line and use a well filtered half-wave rectifier and Zener diode.? The stabilizer draws relatively low current so ripple shouldn¡¯t be too difficult to manage;
- Use a filtered full-wave bridge rectifier on the 12.6VAC line for better ripple suppression. ?Note that one side of the 12.6VAC winding from the AC-4 power supply is grounded/bonded to the chassis.? As such, a standard two-diode full wave rectifier isn¡¯t easily managed here;
- Or as Drake engineers loved, consider hot, power-hungry wire wound resistors to drop voltage on one of the B+ lines.? Frankly, it¡¯s not an option to add even more cabinet heat to a problem that is heat generated in the first place;
- External DC wall cube.? This throw-in-the-towel solution and #3 above just aren¡¯t viable for me.? ?
? Other options come to mind?? I¡¯m not keen on anything that uses DC-DC switching regulators no matter how well they¡¯re filtered.? ? Paul, W9AC
|
Re: Misc parts at NC0B's QTH
Rob Sherwood writes: CF-2K/16 w/ bracket Sherwood $100 Rob, regarding that filter, even though the pin has broken off, it should be repairable? Assuming I can get the cover off it, it should be possible to solder in a replacement pin, no? If you think that's feasable, I'd be willing to buy the filter (at a bit of a discount) and take a shot at MacGyvering it back to life. Cheers, --lyndon
|
Re: WTB GUF-1 8 kHZ filter for R-4C
ok and thanks for the good wishes.? Thought that might be the case.
Blessings David Assaf III W5XU, VP8RXU ?
On Thu, Jan 18, 2024 at 9:27?AM Rob Sherwood < rob@...> wrote:
Hi Dave,
?
Hope you are mending after your hospital incident.
?
If you have my CF-600/6 and/or CF-2K/8 roofing filters, the answer is no.
?
The list of filters are almost all 2nd IF plug-in filters I have collected over time.
?
73, Rob, NC0B
?
?
Rob:? Good morning.? Are these the filters for the Roofing filter Mod?? I have the ones I received from you a couple of years bak and have selected 2 R4C radios to receive them.
?
?
On Wed, Jan 17, 2024 at 9:42?PM Rob Sherwood <rob@...> wrote:
All filters are $75.00 plus $10.00 USPS shipping.? I¡¯ll make a list of misc. filters I have on hand
that need new homes and post it soon.?
?
PayPal to
rob@....??? (Not his email address.)
?
Rob, NC0B
?
?
How much for the Piezo roofing filter?
Gary
?
On Jan 17, 2024, at 9:31?PM, Rob Sherwood <rob@...> wrote:
?
Yes I have one Piezo Technology original first IF roofing filter on the shelf.
I also have a parts R-4C that has been cannibalized, but has the power transformer and a PTO.??
Another more complete R-4C S/N 16354 that is modified for a lot of AM filters.? Otherwise appears
complete if someone wanted to part it out.
Filters:? 6000 Hz, 4000 Hz, 3000 Hz AM, and a 1.5 kHz SSB/CW/RTTY filter.
4 DPDT TO5 Teledyne relays
Both R-4Cs have a reasonably good case with some scratches.
My wife says downsize old stuff.? Hi Hi? Please contact me direct at?Rob@...?if
these could be of use.
Do you happen to have an original first IF roofing filter?
On Jan 17, 2024, at 9:02?PM, Rob Sherwood <rob@...> wrote:
Misc. parts still in inventory at?.?
However no upgrade kits now that I have retired.
If anyone needs a few items to complete an R-4C project I have a few left.
Some shortwave general coverage HC-6/U band crystals.
I have three of the 2611.1 6 kHz INRAD new old stock filters here at my office.? Never used, new
in box.
Contact me direct at 303-722-2257 or?rob@...
Hello, I'm new to groups so if I mess up something, I apologize in advance.
I'm looking for an IRAD guf-1 for the 1st IF
Preferably the 2612.1 (8kHZ) although I would consider the 2611.1
Thanks,
Steve?
?
|
Re: Misc parts at NC0B's QTH
R-4C crystal calibrator is still available.?
?
Blanker sold awaiting funds.?
?
PayPal to rob@...
?
Rob, NC0B
?
toggle quoted message
Show quoted text
From: [email protected] [mailto:[email protected]]
On Behalf Of Patrick Tanner
Sent: Thursday, January 18, 2024 9:37 AM
To: [email protected]
Subject: Re: [DRAKE-RADIO] Misc parts at NC0B's QTH
?
Rob are? the calibrator & blanker for an R4C? I'd take thos if so.
Thanks
Patrick
NQ2M
|
Re: Misc parts at NC0B's QTH
Rob are? the calibrator & blanker for an R4C? I'd take thos if so.
Thanks
Patrick
NQ2M
|
Re: WTB GUF-1 8 kHZ filter for R-4C
Hi Dave,
?
Hope you are mending after your hospital incident.
?
If you have my CF-600/6 and/or CF-2K/8 roofing filters, the answer is no.
?
The list of filters are almost all 2nd IF plug-in filters I have collected over time.
?
73, Rob, NC0B
?
toggle quoted message
Show quoted text
From: [email protected] [mailto:[email protected]]
On Behalf Of David
Sent: Thursday, January 18, 2024 5:38 AM
To: [email protected]
Subject: Re: [DRAKE-RADIO] WTB GUF-1 8 kHZ filter for R-4C
?
Rob:? Good morning.? Are these the filters for the Roofing filter Mod?? I have the ones I received from you a couple of years bak and have selected 2 R4C radios to receive them.
?
?
On Wed, Jan 17, 2024 at 9:42?PM Rob Sherwood <rob@...> wrote:
All filters are $75.00 plus $10.00 USPS shipping.? I¡¯ll make a list of misc. filters I have on hand
that need new homes and post it soon.?
?
PayPal to
rob@....??? (Not his email address.)
?
Rob, NC0B
?
?
How much for the Piezo roofing filter?
Gary
?
On Jan 17, 2024, at 9:31?PM, Rob Sherwood <rob@...> wrote:
?
Yes I have one Piezo Technology original first IF roofing filter on the shelf.
I also have a parts R-4C that has been cannibalized, but has the power transformer and a PTO.??
Another more complete R-4C S/N 16354 that is modified for a lot of AM filters.? Otherwise appears
complete if someone wanted to part it out.
Filters:? 6000 Hz, 4000 Hz, 3000 Hz AM, and a 1.5 kHz SSB/CW/RTTY filter.
4 DPDT TO5 Teledyne relays
Both R-4Cs have a reasonably good case with some scratches.
My wife says downsize old stuff.? Hi Hi? Please contact me direct at?Rob@...?if
these could be of use.
Do you happen to have an original first IF roofing filter?
On Jan 17, 2024, at 9:02?PM, Rob Sherwood <rob@...> wrote:
Misc. parts still in inventory at?.?
However no upgrade kits now that I have retired.
If anyone needs a few items to complete an R-4C project I have a few left.
Some shortwave general coverage HC-6/U band crystals.
I have three of the 2611.1 6 kHz INRAD new old stock filters here at my office.? Never used, new
in box.
Contact me direct at 303-722-2257 or?rob@...
Hello, I'm new to groups so if I mess up something, I apologize in advance.
I'm looking for an IRAD guf-1 for the 1st IF
Preferably the 2612.1 (8kHZ) although I would consider the 2611.1
Thanks,
Steve?
?
|
Re: WTB GUF-1 8 kHZ filter for R-4C
Rob:? Good morning.? Are these the filters for the Roofing filter Mod?? I have the ones I received from you a couple of years bak and have selected 2 R4C radios to receive them.
Hope all is well.
Blessings. David Assaf III W5XU, VP8RXU ?
On Wed, Jan 17, 2024 at 9:42?PM Rob Sherwood < rob@...> wrote:
All filters are $75.00 plus $10.00 USPS shipping.? I¡¯ll make a list of misc. filters I have on hand that need new homes and post it soon.?
?
PayPal to
rob@....??? (Not his email address.)
?
Rob, NC0B
?
?
How much for the Piezo roofing filter?
Gary
On Jan 17, 2024, at 9:31?PM, Rob Sherwood <rob@...> wrote:
?
Yes I have one Piezo Technology original first IF roofing filter on the shelf.
I also have a parts R-4C that has been cannibalized, but has the power transformer and a PTO.??
Another more complete R-4C S/N 16354 that is modified for a lot of AM filters.? Otherwise appears complete if someone wanted to part it out.
Filters:? 6000 Hz, 4000 Hz, 3000 Hz AM, and a 1.5 kHz SSB/CW/RTTY filter.
4 DPDT TO5 Teledyne relays
Both R-4Cs have a reasonably good case with some scratches.
My wife says downsize old stuff.? Hi Hi? Please contact me direct at?Rob@...?if
these could be of use.
Do you happen to have an original first IF roofing filter?
On Jan 17, 2024, at 9:02?PM, Rob Sherwood <rob@...> wrote:
Misc. parts still in inventory at?.? However
no upgrade kits now that I have retired.
If anyone needs a few items to complete an R-4C project I have a few left.
Some shortwave general coverage HC-6/U band crystals.
I have three of the 2611.1 6 kHz INRAD new old stock filters here at my office.? Never used, new in box.
Contact me direct at 303-722-2257 or?rob@...
Hello, I'm new to groups so if I mess up something, I apologize in advance.
I'm looking for an IRAD guf-1 for the 1st IF
Preferably the 2612.1 (8kHZ) although I would consider the 2611.1
Thanks,
Steve?
?
|
Re: New to me drake 4 twins
I measured my L-4B keying voltage at 40V.
Richard Van Hoose? WB6HII?
|
Here are some filters and items available.
$75.00 plus $10.00 shipping unless otherwise? noted.
AS IS, but if they don¡¯t work I will refund the purchase less shipping.
PayPal to rob@...???? (Not this email address)
?
Consider it house cleaning on my part.
?
250 Hz Piezo Tech
500 Hz Piezo Tech
500 Hz INRAD
125 Hz INRAD
1000 Hz for TR-7 Drake
500 Hz Drake
125 Hz Sherwood $100
CF-2K/16 w/ bracket Sherwood $100
500 Hz OEM? $40
2.1 kHz Fox Tango $40
?
Misc.
100 kHz calibrator $30
Noise blanker? $50?
?
Rob, NC0B
|
Re: WTB GUF-1 8 kHZ filter for R-4C
All filters are $75.00 plus $10.00 USPS shipping.? I¡¯ll make a list of misc. filters I have on hand that need new homes and post it soon.?
?
PayPal to
rob@....??? (Not his email address.)
?
Rob, NC0B
?
toggle quoted message
Show quoted text
From: [email protected] [mailto:[email protected]]
On Behalf Of Gary Follett
Sent: Wednesday, January 17, 2024 8:32 PM
To: [email protected]
Subject: Re: [DRAKE-RADIO] WTB GUF-1 8 kHZ filter for R-4C
?
How much for the Piezo roofing filter?
Gary
On Jan 17, 2024, at 9:31?PM, Rob Sherwood <rob@...> wrote:
?
Yes I have one Piezo Technology original first IF roofing filter on the shelf.
I also have a parts R-4C that has been cannibalized, but has the power transformer and a PTO.??
Another more complete R-4C S/N 16354 that is modified for a lot of AM filters.? Otherwise appears complete if someone wanted to part it out.
Filters:? 6000 Hz, 4000 Hz, 3000 Hz AM, and a 1.5 kHz SSB/CW/RTTY filter.
4 DPDT TO5 Teledyne relays
Both R-4Cs have a reasonably good case with some scratches.
My wife says downsize old stuff.? Hi Hi? Please contact me direct at?Rob@...?if
these could be of use.
Do you happen to have an original first IF roofing filter?
On Jan 17, 2024, at 9:02?PM, Rob Sherwood <rob@...> wrote:
Misc. parts still in inventory at?.? However
no upgrade kits now that I have retired.
If anyone needs a few items to complete an R-4C project I have a few left.
Some shortwave general coverage HC-6/U band crystals.
I have three of the 2611.1 6 kHz INRAD new old stock filters here at my office.? Never used, new in box.
Contact me direct at 303-722-2257 or?rob@...
Hello, I'm new to groups so if I mess up something, I apologize in advance.
I'm looking for an IRAD guf-1 for the 1st IF
Preferably the 2612.1 (8kHZ) although I would consider the 2611.1
Thanks,
Steve?
?
|
Re: WTB GUF-1 8 kHZ filter for R-4C
How much for the Piezo roofing filter?
toggle quoted message
Show quoted text
On Jan 17, 2024, at 9:31?PM, Rob Sherwood <rob@...> wrote:
Hi Gary, ? Yes I have one Piezo Technology original first IF roofing filter on the shelf. ? I also have a parts R-4C that has been cannibalized, but has the power transformer and a PTO.?? ? Another more complete R-4C S/N 16354 that is modified for a lot of AM filters.? Otherwise appears complete if someone wanted to part it out. Filters:? 6000 Hz, 4000 Hz, 3000 Hz AM, and a 1.5 kHz SSB/CW/RTTY filter. Stock 8 kHz filter. 4 DPDT TO5 Teledyne relays PTO XFMR 100 kHz calibrator ? Both R-4Cs have a reasonably good case with some scratches. ? My wife says downsize old stuff.? Hi Hi? Please contact me direct at?Rob@...?if these could be of use. ? Rob, NC0B ? ? ? ? Do you happen to have an original first IF roofing filter? WoDVN
On Jan 17, 2024, at 9:02?PM, Rob Sherwood < rob@...> wrote: ? Misc. parts still in inventory at?.? However no upgrade kits now that I have retired. If anyone needs a few items to complete an R-4C project I have a few left. Some shortwave general coverage HC-6/U band crystals. I have three of the 2611.1 6 kHz INRAD new old stock filters here at my office.? Never used, new in box. Contact me direct at 303-722-2257 or?rob@... Hello, I'm new to groups so if I mess up something, I apologize in advance.
I'm looking for an IRAD guf-1 for the 1st IF
Preferably the 2612.1 (8kHZ) although I would consider the 2611.1
Thanks,
Steve? ?
|
Re: WTB GUF-1 8 kHZ filter for R-4C
Hi Gary,
?
Yes I have one Piezo Technology original first IF roofing filter on the shelf.
?
I also have a parts R-4C that has been cannibalized, but has the power transformer and a PTO.??
?
Another more complete R-4C S/N 16354 that is modified for a lot of AM filters.? Otherwise appears complete if someone wanted to part it out.
Filters:? 6000 Hz, 4000 Hz, 3000 Hz AM, and a 1.5 kHz SSB/CW/RTTY filter.
Stock 8 kHz filter.
4 DPDT TO5 Teledyne relays
PTO
XFMR
100 kHz calibrator
?
Both R-4Cs have a reasonably good case with some scratches.
?
My wife says downsize old stuff.? Hi Hi? Please contact me direct at
Rob@... if these could be of use.
?
Rob, NC0B
?
?
?
toggle quoted message
Show quoted text
From: [email protected] [mailto:[email protected]]
On Behalf Of Gary Follett
Sent: Wednesday, January 17, 2024 8:07 PM
To: [email protected]
Subject: Re: [DRAKE-RADIO] WTB GUF-1 8 kHZ filter for R-4C
?
Do you happen to have an original first IF roofing filter?
WoDVN
On Jan 17, 2024, at 9:02?PM, Rob Sherwood <rob@...> wrote:
?
Misc. parts still in inventory at?.? However
no upgrade kits now that I have retired.
If anyone needs a few items to complete an R-4C project I have a few left.
Some shortwave general coverage HC-6/U band crystals.
I have three of the 2611.1 6 kHz INRAD new old stock filters here at my office.? Never used, new in box.
Contact me direct at 303-722-2257 or?rob@...
Hello, I'm new to groups so if I mess up something, I apologize in advance.
I'm looking for an IRAD guf-1 for the 1st IF
Preferably the 2612.1 (8kHZ) although I would consider the 2611.1
Thanks,
Steve?
?
|
Paul Christensen
Jim Shorney
David
Rob Sherwood