Re: [AMRadio] Power Resistor

[Rev. Don Sanders]

I am getting ready to revamp my Ranger I and I would really appreciate a
copy of the information on the Ranger. If there is any cost involved for
printing or postage please let me know. Thanks
Healthfully yours,
  Rev. Don Sanders W4BWS
PO Box 10195
Dothan, AL 36304
- Original Message - 
From: "Byron Lichtenwalner" <[EMAIL PROTECTED]>
To: "Discussion of AM Radio" 
Sent: Sunday, March 20, 2005 7:42 PM
Subject: Re: [AMRadio] Power Resistor


> I have received several reply tat suggest using a regular 1/4 or 1/2 watt
> pot and a "current amplifier" horiziontal output traqnsistor (NPN).  That
> triggered my memory, and I found such a circuit by W3BYM in Electric
Radio,
> Dec. 2000, that included some other recommened changes for the Ranger.
>
> Think I am all set now.  Thanks for all the suggestions.
>
> Byron, W3WKR
>
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Re: [AMRadio] Power Resistor

[Donald Chester]

   You could buy the 25K, use your old clamp to tap at
20K, and the new tap for whatever you need. That would
cut the rating to 40 watts however..

Alternatively parallel the 25K 50 watt with a 100K
fixed 10 watt, and you got 20K with an adjustable tap!



You might be able to just substitute the 20K with a 25K and it would work 
fine.  Depending on its function in the circuit, the value of a resistor is 
often not critical.  I  made a similar substitution with the voltage divider 
in the bias supply of my Gates BC1-T and could tell absolutely no 
difference.  In older rigs with carbon resistors, some the resistances may 
have shifted a greater percentage than that, but the circuits still work OK.


Don k4kyv

Re: [AMRadio] Power Resistor

[Jim Wilhite]

This link explains the drive pot replacement for the DX 100 you are speaking 
about Jim.


http://www.amwindow.org/tech/htm/drivepot.htm

If it is a drive pot replacement with low current, the transistor should not 
need heat sinking; and the article explains how to mount it on a solder 
terminal strip.


In my case, I need voltage at both ends of the power resistor and a slider 
in the middle at ground, then sliders between each end and ground to give me 
voltage.  I can redesign the circuit I am fooling with by using pots but do 
not have the metal tools to make brackets, unfortunately.


I am going to have to do something, for my radio is in too good electrical 
condition to part out.


73  Jim
W5JO






Byron,

  I recall someone in your situation using a lower wattage pot, and a HV
NPN Horizontal output transistor as an emitter follower. A resistor from
emitter to ground is required, maybe 47K 2 watts. You might think about 
that

option. This transistor will need to be heat sinked, and the case isolated
from ground with a mica insulator, and a little "owl sh_t" grease. If the
transistor beta is 100 at say 20ma emitter current, then the base current 
is
.02/100 or 200 ua. Your pot will stay cool as the transistor does the 
work.

In case the output gets shorted, maybe add a 470 ohm series resistor that
should fry in the case of a short. I'd put that on the collector side 
going
to the low B+ since it might quench out a parasitic before it gets 
started.


Regards,
Jim

RE: [AMRadio] Power Resistor

[Jim candela]

Byron,

Seems that 20K is tough to find these days! At the link below, they got
a 25K 5 watt pot:
I bet that would do.

http://dkc3.digikey.com/PDF/T051/1066.pdf

Regards,
Jim

-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] Behalf Of Byron Lichtenwalner
Sent: Sunday, March 20, 2005 10:31 AM
To: Discussion of AM Radio
Subject: Re: [AMRadio] Power Resistor


I have been following the discussion on Jim's problem, and have a similar
"quest".

I have been trying to find a 4 watt, 20 k pot. to use in a Ranger power
control circuit as described by W3AM.  Have had no luck in finding on.  Any
ideas?

Byron, W3WKR

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Re: [AMRadio] Power Resistor

[Byron Lichtenwalner]

I have received several reply tat suggest using a regular 1/4 or 1/2 watt 
pot and a "current amplifier" horiziontal output traqnsistor (NPN).  That 
triggered my memory, and I found such a circuit by W3BYM in Electric Radio, 
Dec. 2000, that included some other recommened changes for the Ranger.


Think I am all set now.  Thanks for all the suggestions.

Byron, W3WKR 

Re: [AMRadio] Power Resistor

[Geoff]

Jim candela wrote:


Byron,

  I recall someone in your situation using a lower wattage pot, and a HV
NPN Horizontal output transistor as an emitter follower. A resistor from
emitter to ground is required, maybe 47K 2 watts. You might think about that
option. This transistor will need to be heat sinked, and the case isolated
from ground with a mica insulator, and a little "owl sh_t" grease. If the
transistor beta is 100 at say 20ma emitter current, then the base current is
.02/100 or 200 ua. Your pot will stay cool as the transistor does the work.
In case the output gets shorted, maybe add a 470 ohm series resistor that
should fry in the case of a short. I'd put that on the collector side going
to the low B+ since it might quench out a parasitic before it gets started.



or a diode from the collector back to the base, to prevent meltdown.


Jim, that utramodulated Viking I... is that the "engine is in" transmitter?

---
73 = Best Regards,
-Geoff/W5OMR

RE: [AMRadio] Power Resistor

[Jim candela]

Byron,

   I recall someone in your situation using a lower wattage pot, and a HV
NPN Horizontal output transistor as an emitter follower. A resistor from
emitter to ground is required, maybe 47K 2 watts. You might think about that
option. This transistor will need to be heat sinked, and the case isolated
from ground with a mica insulator, and a little "owl sh_t" grease. If the
transistor beta is 100 at say 20ma emitter current, then the base current is
.02/100 or 200 ua. Your pot will stay cool as the transistor does the work.
In case the output gets shorted, maybe add a 470 ohm series resistor that
should fry in the case of a short. I'd put that on the collector side going
to the low B+ since it might quench out a parasitic before it gets started.

Regards,
Jim

-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] Behalf Of Byron Lichtenwalner
Sent: Sunday, March 20, 2005 10:31 AM
To: Discussion of AM Radio
Subject: Re: [AMRadio] Power Resistor


I have been following the discussion on Jim's problem, and have a similar
"quest".

I have been trying to find a 4 watt, 20 k pot. to use in a Ranger power
control circuit as described by W3AM.  Have had no luck in finding on.  Any
ideas?

Byron, W3WKR

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Help: http://mailman.qth.net/mmfaq.html
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Version: 7.0.308 / Virus Database: 266.7.4 - Release Date: 3/18/2005

Re: [AMRadio] Power Resistor

[Byron Lichtenwalner]

I have been following the discussion on Jim's problem, and have a similar
"quest".

I have been trying to find a 4 watt, 20 k pot. to use in a Ranger power
control circuit as described by W3AM.  Have had no luck in finding on.  Any
ideas?

Byron, W3WKR

Re: [AMRadio] 5100b Normal operation?

[Mark Bell]

On the HT-37, you still have to manually turn the function switch into the
MOX position for CW, then back into
STBY for receive.There is a PTT modification for the HT-37, but I'm not
sure that applies to CW
as George would like.

George, this was normal for that era, and as such, it didn't need to be
"addressed".   Having PTT on the 5100B
is rather nice on AM/SSB.   However, other radios of that era, such as the
DX-100, do not have PTT for
phone, and you need to flip the HV switch On and Off.Right now, when I
use my DX-100, I need to toggle the
transmitter's HV switch and the Receiver's function switch.   I'll get
around to changing that one of these days, but it's really not  a problem
with two switches to throw.

73 Mark K3MSB

- Original Message - 
From: "Geoff" <[EMAIL PROTECTED]>
To: "Discussion of AM Radio" 
Sent: Sunday, March 20, 2005 8:48 AM
Subject: Re: [AMRadio] 5100b Normal operation?


> George KB2Z wrote:
>
> > Morning all,
> > 5100b , Is it normal? question.
> > When in the HV setting the the tx relay closes and the rx mutes.
> > In phone with PTT its not an issue but in CW the HV switch acts more
> > like a send receive switch.
> > The rx is muted as long as the HV is on. Key up, key down, makes no
> > difference.
> > Is it normal for the 5100b or is something crossed?
> > If normal was it ever addressed? I dont need QSK but the on/off
> > switching of the HV is a bother.
> > Thanks in advance, George KB2Z
> >
>
> Yup, that's normal of all those older rigs that incorporated seperate
> transmitters and receivers.
>
> It wasn't until the 60's, with the advent of "vox" when 'break-in' CW
> came about.  I -think-
> one of the first rigs to do this, that was still a seperate machine from
> the receiver, was the
> Hallicrafter HT-37.
>
> Revolutionary, those 60's. :-)
>
>
> 73 = Best Regards,
> -Geoff/W5OMR
>
>
> __
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> Home: http://mailman.qth.net/mailman/listinfo/amradio
> Help: http://mailman.qth.net/mmfaq.html
> Post: mailto:AMRadio@mailman.qth.net
>

Re: [AMRadio] Power Resistor

[Jim Wilhite]

Room is the problem Jim.  Wish I had just a bit more to do that.

73  Jim 
W5JO





Jim,

  You could buy the 25K, use your old clamp to tap at
20K, and the new tap for whatever you need. That would
cut the rating to 40 watts however..

   Alternatively parallel the 25K 50 watt with a 100K
fixed 10 watt, and you got 20K with an adjustable tap!



Jim
WD5JKO

Re: [AMRadio] Power Resistor

[Jim Wilhite]

So have I but in this case, surface rust prevents a repair because the other 
sliders won't make contact. The wire under the contacts is rusted to the 
point the sliders do not work.  Thanks for the suggestion Gary.


73  Jim
W5JO






Jim,

I have repaired those resistors by putting a clamp over the burned out 
spot. Usually works fine.


73
Gary  K4FMX

Re: [AMRadio] Power Resistor

[Jim Candela]

Jim,

   You could buy the 25K, use your old clamp to tap at
20K, and the new tap for whatever you need. That would
cut the rating to 40 watts however..

Alternatively parallel the 25K 50 watt with a 100K
fixed 10 watt, and you got 20K with an adjustable tap!



Jim
WD5JKO

--- Gary Schafer <[EMAIL PROTECTED]> wrote:
> Jim,
> 
> I have repaired those resistors by putting a clamp
> over the burned out 
> spot. Usually works fine.
> 
> 73
> Gary  K4FMX
> 
> Jim Wilhite wrote:
> > No minimum order required and no handling charge
> either.  In the past, 
> > if they did not have the item in stock and had to
> ship some part later, 
> > they didn't charge shipping on the second package
> unless the high price 
> > of fuel has changed things.  Good people to do
> business with.
> > 
> > The problem with series (say 2 - 10k ) is
> mounting.  Not enough room. 
> > Thanks for the suggestion Jim.
> > 
> > 73  Jim
> > W5JO
> > 
> > - Original Message - From: "Donald
> Chester" <[EMAIL PROTECTED]>
> > To: 
> > Sent: Sunday, March 20, 2005 2:41 AM
> > Subject: RE: [AMRadio] Power Resistor
> > 
> > 
> >>
> >>
> >>>   Try Mouser at www.mouser.com
> >>>
> >>> or at http://www.mouser.com/catalog/621/437.pdf
> >>>
> >>> They have 10K, and 25K at 25 watts or 50 watts
> adjuatable. Maybe get 
> >>> a 10K
> >>> fixed at 25 watt, and series with another 10K at
> 25 watt adjustable. 
> >>> If you
> >>> can tolerate 25K this is a one piece solution
> for $11.61 + .29 twice for
> >>> mounting ears. mouser is a Fast shipper!
> >>
> >>
> >>
> >> Do they require a minimum order for shipment?
> >>
> >> Don K4KYV
> > 
> > 
> > 
> >
>
__
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> http://mailman.qth.net/mailman/listinfo/amradio
> > Help: http://mailman.qth.net/mmfaq.html
> > Post: mailto:AMRadio@mailman.qth.net
> > 
> > 
> 
> 
> 
>
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> Post: mailto:AMRadio@mailman.qth.net
> 

Re: [AMRadio] Power Resistor

[Gary Schafer]

Jim,

I have repaired those resistors by putting a clamp over the burned out 
spot. Usually works fine.


73
Gary  K4FMX

Jim Wilhite wrote:
No minimum order required and no handling charge either.  In the past, 
if they did not have the item in stock and had to ship some part later, 
they didn't charge shipping on the second package unless the high price 
of fuel has changed things.  Good people to do business with.


The problem with series (say 2 - 10k ) is mounting.  Not enough room. 
Thanks for the suggestion Jim.


73  Jim
W5JO

- Original Message - From: "Donald Chester" <[EMAIL PROTECTED]>
To: 
Sent: Sunday, March 20, 2005 2:41 AM
Subject: RE: [AMRadio] Power Resistor






  Try Mouser at www.mouser.com

or at http://www.mouser.com/catalog/621/437.pdf

They have 10K, and 25K at 25 watts or 50 watts adjuatable. Maybe get 
a 10K
fixed at 25 watt, and series with another 10K at 25 watt adjustable. 
If you

can tolerate 25K this is a one piece solution for $11.61 + .29 twice for
mounting ears. mouser is a Fast shipper!




Do they require a minimum order for shipment?

Don K4KYV




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Re: [AMRadio] Power Resistor

[Jim Wilhite]

No minimum order required and no handling charge either.  In the past, if 
they did not have the item in stock and had to ship some part later, they 
didn't charge shipping on the second package unless the high price of fuel 
has changed things.  Good people to do business with.


The problem with series (say 2 - 10k ) is mounting.  Not enough room. 
Thanks for the suggestion Jim.


73  Jim
W5JO

- Original Message - 
From: "Donald Chester" <[EMAIL PROTECTED]>

To: 
Sent: Sunday, March 20, 2005 2:41 AM
Subject: RE: [AMRadio] Power Resistor






  Try Mouser at www.mouser.com

or at http://www.mouser.com/catalog/621/437.pdf

They have 10K, and 25K at 25 watts or 50 watts adjuatable. Maybe get a 10K
fixed at 25 watt, and series with another 10K at 25 watt adjustable. If 
you

can tolerate 25K this is a one piece solution for $11.61 + .29 twice for
mounting ears. mouser is a Fast shipper!



Do they require a minimum order for shipment?

Don K4KYV

Re: [AMRadio] 5100b Normal operation?

[Geoff]

George KB2Z wrote:


Morning all,
5100b , Is it normal? question.
When in the HV setting the the tx relay closes and the rx mutes.
In phone with PTT its not an issue but in CW the HV switch acts more 
like a send receive switch.
The rx is muted as long as the HV is on. Key up, key down, makes no 
difference.

Is it normal for the 5100b or is something crossed?
If normal was it ever addressed? I dont need QSK but the on/off 
switching of the HV is a bother.

Thanks in advance, George KB2Z



Yup, that's normal of all those older rigs that incorporated seperate 
transmitters and receivers.


It wasn't until the 60's, with the advent of "vox" when 'break-in' CW 
came about.  I -think-
one of the first rigs to do this, that was still a seperate machine from 
the receiver, was the

Hallicrafter HT-37.

Revolutionary, those 60's. :-)


73 = Best Regards,
-Geoff/W5OMR

[AMRadio] 5100b Normal operation?

[George KB2Z]

Morning all,
5100b , Is it normal? question.
When in the HV setting the the tx relay closes and the rx mutes.
In phone with PTT its not an issue but in CW the HV switch acts more like a 
send receive switch.

The rx is muted as long as the HV is on. Key up, key down, makes no difference.
Is it normal for the 5100b or is something crossed?
If normal was it ever addressed? I dont need QSK but the on/off switching 
of the HV is a bother.

Thanks in advance, George KB2Z

Re: [AMRadio] B&K 1602 Power Supply question

[Geoff]

Mahlon Haunschild wrote:

> Hello, list.  Have acquired a B&K 1602 HV power supply.  Basic 
problem is no C- voltage (that's the one intended for use as a bias 
supply, I believe).  Internal inspection of the unit's pc board reveals 
that R33 is burned beyond recognition and Q3 is GONE (well, the lead 
frame is there, but the plastic case is nowhere to be found).  So, if 
anyone has one of these beasts (or at least the manual), could you 
please tell me what the value/part no is for these components?  Thanks.

>
> regards,
>
> Mahlon - K4OQ



What is so hard about going to http://www.google.com?

Google coughed these up...


WE 
GOT THAT!
... B&K 1602 DC SUPPLY. 167. B&K 1640 MOBILE PS. 168. B&K GUIDE TO 
OSCILLOSCOPES. 169. B&K 2160. 170. B&K 3020 SWEEP/FUNCTON GENERATOR ...
hometown.aol.com/joeee1621/ myhomepage/business.html?mtbrand=AOL_US - 
513k - Cached - Similar pages


WA2RQY MANUAL SALES
... B&K 1602 DC SUPPLY. 164. B&K 1640 MOBILE PS. 165. B&K GUIDE TO 
OSCILLOSCOPES. 166. B&K 2160. 167. B&K 3020 SWEEP/FUNCTON GENERATOR ...

www.myradioroom.com/manualsales.html - 73k - Cached - Similar pages

WE GOT THAT!
... B&K 1602 DC SUPPLY. 165. B&K 1640 MOBILE PS. 166. B&K GUIDE TO 
OSCILLOSCOPES. 167. B&K 2160. 168. B&K 3020 SWEEP/FUNCTON GENERATOR ...
members.aol.com/joeee1621/ myhomepage/business.html?mtbrand=AOL_US - 
513k - Cached - Similar pages


<[EMAIL PROTECTED]> : v02.n061 : 02/25/99, 14:55:35 : Re ...
... B&K 1602 power supply Chris and Sue Beck <[EMAIL PROTECTED]> : 
v02.n145 : 05/17/99, 20:15:58 : Re: screen supplies Chris and Sue Beck 
<[EMAIL PROTECTED]> ...
www.nmr.mgh.harvard.edu/~reese/ 
joetest/indices/articles_v02_author_idx.txt - 513k - Cached - Similar pages


73 = Best Regards,
-Geoff/W5OMR

Re: [AMRadio] Viking 2 Switch

[GBrown]

Ron::
While I look for the knob, I believe I also have the meter switch.
Regards,
Gary...WZ1M
- Original Message - 
From: <[EMAIL PROTECTED]>
To: 
Sent: Saturday, March 19, 2005 10:14 PM
Subject: [AMRadio] Viking 2 Switch


> I am putting another Viking2 on the air and I need the meter function 
> switch...Any out there?..Tnx es 73's Ron W6MAU
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> 

RE: [AMRadio] Power Resistor

[Donald Chester]

  Try Mouser at www.mouser.com

or at http://www.mouser.com/catalog/621/437.pdf

They have 10K, and 25K at 25 watts or 50 watts adjuatable. Maybe get a 10K
fixed at 25 watt, and series with another 10K at 25 watt adjustable. If you
can tolerate 25K this is a one piece solution for $11.61 + .29 twice for
mounting ears. mouser is a Fast shipper!



Do they require a minimum order for shipment?

Don K4KYV