A local ham dropped in a Yaesu FL-2100Z amp tp me and said that he would like all the PA0FRI mods done to it.
See
This is no big problem, as most of the mods are common sense and they are what one would normally do to an amp.
However, there is one mod that strikes me as odd.
He suggests cutting the grounding wires on VC1, the plate tune capacitor, and running a thick wire or coax from the cold side of VC1 to a ground point at the base of one of the 572B sockets.
This seems very odd to me. I don't see how this would enhance stability, having that grounding wire running all that way.
Every amp I have seen or built, has the cold end of the capacitor bonded to the nearest point on the chassis.
Should one be doing this mod? My feeling is that it should be left alone.
Opinions appreciated.
Thanks, Alek.
VK6APK
--
From sunny Binningup
Family Businesses:
SP Electrical. www.spelectrical.net.au
The Velvet Fox.
Smart Design Electrical.
Perth Interiors.
|
Filling the connector with a dielectric splodge is certainly a new trick to me.? Even with PL259s I've always just wrapped things in good self-amalgamating tape to waterproof it properly and have rarely had problems with water ingress even here on Rainy Island.? Most water ingress issues I've had have been due to damage to the coax outer jacket.
Still, thanks for the tip.
The real answer is of course to use N-type or 7/16 connectors?
cheers Dave G0OIL
On Wednesday, 28 August 2019, 20:15:23 GMT-4, Alek Petkovic vk6apk@... [ham_amplifiers] wrote:
?
OK Thanks Mike and others who replied.
Jerry, WA8R, knew what I was talking about.
The stuff is called "Stuf" and it's made by Cross Devices. See
I have placed an order with RF Parts, for 5 tubes of it.
Cheers and thanks,
Alek.
On 28/08/2019 5:36 PM, n2lym n2lym@... [ham_amplifiers] wrote:
Automotive
silicon dielectric grease works for me.
73
Mike
On August 28, 2019 at 5:31 AM "Alek Petkovic
vk6apk@... [ham_amplifiers]"
wrote:
?
Does anybody know where to get "Stuff?"
I'm talking about the goo that you put in coax connector joins, which
fills the void in the connection and seals out any moisture.
A Google search has come up blank.
73 and thanks,
Alek.
--
From sunny Binningup
Family Businesses:
SP Electrical.
The Velvet Fox.
Smart Design Electrical.
Perth Interiors.
?
?
--
From sunny Binningup
Family Businesses:
SP Electrical.
The Velvet Fox.
Smart Design Electrical.
Perth Interiors.
|
Wow, a UB50 beam hey....that antenna will work very nicely!
We just need Solar Cycle 25 to arrive.....you'll be well prepared when it
does.
Hopefully being deployed at considerable height.....I expect to hear a
sonorous signal from VK6 land when pointed easterly toward distant Adelaide!
Leigh
toggle quoted message
Show quoted text
-----Original Message----- From: Alek Petkovic [mailto:vk6apk@...] Sent: Thursday, 29 August 2019 12:02 PM To: Leigh Turner Cc: ham_amplifiers@... Subject: Re: [ham_amplifiers] Stuff? Thanks Leigh. Yes, I bought 5 tubes, to share the postage costs, plus I know that the 3 mates who are coming down here to help build and install my Ultrabeam UB50, (if it ever stops raining) will want some. I'll be able to send them home with their own tube, after we've finished and the have polished off all my beer. 73, Alek. On 29/08/2019 10:16 AM, Leigh Turner wrote: Indeed Alek, the stuff here is called STUF... :-)
I can vouch for its efficacy as a stable non-hardening moisture sealant
compound and it works a treat in preserving weather exposed RF connector
internals like new.
I was supplied a toothpaste-style tube of the "STUF" stuff some years back
with a Butternut antenna and coaxial hardware bought through HRO. Used
sparingly a tube of the compound lasts a long time!
Leigh
VK5KLT
________________________________________
From: ham_amplifiers@... [mailto:ham_amplifiers@...]
Sent: Thursday, 29 August 2019 9:40 AM
To: ham_amplifiers@...
Subject: Re: [ham_amplifiers] Stuff?
OK Thanks Mike and others who replied.
Jerry, WA8R, knew what I was talking about.
The stuff is called "Stuf" and it's made by Cross Devices. See
I have placed an order with RF Parts, for 5 tubes of it.
Cheers and thanks,
Alek.
On 28/08/2019 5:36 PM, n2lym n2lym@... [ham_amplifiers] wrote:
Automotive silicon dielectric grease works for me.
73
Mike
On August 28, 2019 at 5:31 AM "Alek Petkovic vk6apk@...
[ham_amplifiers]"<ham_amplifiers@...> wrote:
Does anybody know where to get "Stuff?"
I'm talking about the goo that you put in coax connector joins, which
fills the void in the connection and seals out any moisture.
A Google search has come up blank.
73 and thanks,
Alek.
-- From sunny Binningup
|
Thanks Leigh.
Yes, I bought 5 tubes, to share the postage costs, plus I know that the 3 mates who are coming down here to help build and install my Ultrabeam UB50, (if it ever stops raining) will want some. I'll be able to send them home with their own tube, after we've finished and the have polished off all my beer.
73, Alek.
toggle quoted message
Show quoted text
On 29/08/2019 10:16 AM, Leigh Turner wrote: Indeed Alek, the stuff here is called STUF.. :-)
I can vouch for its efficacy as a stable non-hardening moisture sealant
compound and it works a treat in preserving weather exposed RF connector
internals like new.
I was supplied a toothpaste-style tube of the STUF stuff some years back
with a Butternut antenna and coaxial hardware bought through HRO. Used
sparingly a tube of the compound lasts a long time!
Leigh
VK5KLT
________________________________________
From: ham_amplifiers@... [mailto:ham_amplifiers@...]
Sent: Thursday, 29 August 2019 9:40 AM
To: ham_amplifiers@...
Subject: Re: [ham_amplifiers] Stuff?
OK Thanks Mike and others who replied.
Jerry, WA8R, knew what I was talking about.
The stuff is called "Stuf" and it's made by Cross Devices. See
I have placed an order with RF Parts, for 5 tubes of it.
Cheers and thanks,
Alek.
On 28/08/2019 5:36 PM, n2lym n2lym@... [ham_amplifiers] wrote:
Automotive silicon dielectric grease works for me.
73
Mike
On August 28, 2019 at 5:31 AM "Alek Petkovic vk6apk@...
[ham_amplifiers]"<ham_amplifiers@...> wrote:
Does anybody know where to get "Stuff?"
I'm talking about the goo that you put in coax connector joins, which
fills the void in the connection and seals out any moisture.
A Google search has come up blank.
73 and thanks,
Alek.
--
From sunny Binningup
Family Businesses:
SP Electrical. www.spelectrical.net.au
The Velvet Fox.
Smart Design Electrical.
Perth Interiors.
|
Indeed Alek, the stuff here is called STUF¡.. :-)
I can vouch for its efficacy as a stable non-hardening moisture sealant
compound and it works a treat in preserving weather exposed RF connector
internals like new.
I was supplied a toothpaste-style tube of the ¡°STUF¡± stuff some years back
with a Butternut antenna and coaxial hardware bought through HRO. Used
sparingly a tube of the compound lasts a long time!
Leigh
VK5KLT
________________________________________
From: ham_amplifiers@... [mailto:ham_amplifiers@...]
Sent: Thursday, 29 August 2019 9:40 AM
To: ham_amplifiers@...
Subject: Re: [ham_amplifiers] Stuff?
OK Thanks Mike and others who replied.
Jerry, WA8R, knew what I was talking about.
The stuff is called "Stuf" and it's made by Cross Devices. See
I have placed an order with RF Parts, for 5 tubes of it.
Cheers and thanks,
Alek.
toggle quoted message
Show quoted text
On 28/08/2019 5:36 PM, n2lym n2lym@... [ham_amplifiers] wrote:
Automotive silicon dielectric grease works for me.
73
Mike
On August 28, 2019 at 5:31 AM "Alek Petkovic vk6apk@...
[ham_amplifiers]" <ham_amplifiers@...> wrote:
Does anybody know where to get "Stuff?"
I'm talking about the goo that you put in coax connector joins, which
fills the void in the connection and seals out any moisture.
A Google search has come up blank.
73 and thanks,
Alek.
--
From sunny Binningup
Family Businesses:
SP Electrical. www.spelectrical.net.au
The Velvet Fox.
Smart Design Electrical.
Perth Interiors.
|
OK Thanks Mike and others who replied.
Jerry, WA8R, knew what I was talking about.
The stuff is called "Stuf" and it's made by Cross Devices. See
I have placed an order with RF Parts, for 5 tubes of it.
Cheers and thanks,
Alek.
On 28/08/2019 5:36 PM, n2lym n2lym@... [ham_amplifiers] wrote:
Automotive
silicon dielectric grease works for me.
73
Mike
On August 28, 2019 at 5:31 AM "Alek Petkovic
vk6apk@... [ham_amplifiers]"
wrote:
?
Does anybody know where to get "Stuff?"
I'm talking about the goo that you put in coax connector joins, which
fills the void in the connection and seals out any moisture.
A Google search has come up blank.
73 and thanks,
Alek.
--
From sunny Binningup
Family Businesses:
SP Electrical.
The Velvet Fox.
Smart Design Electrical.
Perth Interiors.
?
?
--
From sunny Binningup
Family Businesses:
SP Electrical.
The Velvet Fox.
Smart Design Electrical.
Perth Interiors.
|
Hi Alek
Stuff?
You mean Splodge?? I always find that Splodge works better than Stuff.
Alternatively try Tiger Seal or similar from a motor factors.??
Dave
On Wednesday, 28 August 2019, 05:33:20 GMT-4, Alek Petkovic vk6apk@... [ham_amplifiers] wrote:
?
Does anybody know where to get "Stuff?"
I'm talking about the goo that you put in coax connector joins, which
fills the void in the connection and seals out any moisture.
A Google search has come up blank.
73 and thanks,
Alek.
--
From sunny Binningup
Family Businesses:
SP Electrical. www.spelectrical.net.au
The Velvet Fox. https://www.facebook.com/TheVelvetFox/
Smart Design Electrical. https://www.facebook.com/smartdesignelectrical/
Perth Interiors. https://www.instagram.com/perthinteriors/
|
Next time you see a telephone lineman, ask him for a tube of his line
sealant. Works great. But, be aware, that once sealed, it isn't coming
back apart again.
Joe - W7RKN
toggle quoted message
Show quoted text
-----Original Message-----
From: ham_amplifiers@... [mailto:ham_amplifiers@...]
Subject: [ham_amplifiers] Stuff?
Does anybody know where to get "Stuff?"
I'm talking about the goo that you put in coax connector joins, which
fills the void in the connection and seals out any moisture.
A Google search has come up blank.
73 and thanks,
Alek.
|
Automotive silicon dielectric grease works for me.
73
Mike
On August 28, 2019 at 5:31 AM "Alek Petkovic vk6apk@... [ham_amplifiers]" <ham_amplifiers@...> wrote:
?Does anybody know where to get "Stuff?"
I'm talking about the goo that you put in coax connector joins, which
fills the void in the connection and seals out any moisture.
A Google search has come up blank.
73 and thanks,
Alek.
--
From sunny Binningup
Family Businesses:
SP Electrical. www.spelectrical.net.au
The Velvet Fox. https://www.facebook.com/TheVelvetFox/
Smart Design Electrical. https://www.facebook.com/smartdesignelectrical/
Perth Interiors. https://www.instagram.com/perthinteriors/
?
?
|
Does anybody know where to get "Stuff?"
I'm talking about the goo that you put in coax connector joins, which fills the void in the connection and seals out any moisture.
A Google search has come up blank.
73 and thanks,
Alek.
--
From sunny Binningup
Family Businesses:
SP Electrical. www.spelectrical.net.au
The Velvet Fox.
Smart Design Electrical.
Perth Interiors.
|
Jim, ask him if Eimac supplied tooling is used to build the Chinese 8877 and 3CX3000A7.
Carl
toggle quoted message
Show quoted text
----- Original Message -----
From: jim.thom@... [ham_amplifiers]
To: ham_amplifiers@...
Sent: Wednesday, July 10, 2019 12:46 PM
Subject: [ham_amplifiers] Reply from ECONCO
Hello Jim,
If the Svetlana tubes have good grids then we can repair them. If the grids are bad then we don¡¯t rebuild them. We don¡¯t buy Svetlana duds so we don¡¯t normally have stock on Svetlana tubes.
As far as the Chinese duds go we can rebuild them but we don¡¯t replace seals, ceramics or anodes on them no major work. So if they are new duds then we usually can repair them at least once.
If you have any other questions please let me know.
Thank you
Matt Lindsey
Econco/Technical Customer Service
1318 Commerce Ave.
Woodland CA 95776
800-532-6626 Ext 101
## Typ, if the tube has lost emission, they re-thoriate the directly heated cathode... with
acetylene gas. With Eimac tubes, they can also replace grids, anode, ceramic... both on triodes + tetrodes. See their reply above, re: svetlana + chinese tubes.
Jim VE7RF
---
This email has been checked for viruses by AVG.
|
Hello
Jim, If
the Svetlana tubes have good grids then we can repair them. If the grids are bad
then we don¡¯t rebuild them. We don¡¯t buy Svetlana duds so we don¡¯t normally have
stock on Svetlana tubes. As
far as the Chinese duds go we can rebuild them but we don¡¯t replace seals,
ceramics or anodes on them no major work. So if they are new duds then we
usually can repair them at least once. If
you have any other questions please let me know. ?
Thank
you
Matt
Lindsey
Econco/Technical
Customer Service
1318
Commerce Ave.
Woodland
CA? 95776
800-532-6626
Ext 101
? ##? Typ, if the? tube? has lost? emission,? they? re-thoriate the? directly? heated? cathode...? with acetylene gas.? ?With? Eimac? tubes,? they can also? replace grids,? anode, ceramic... both on? triodes + tetrodes.? ? See? their reply? above, re:? svetlana + chinese tubes.?
Jim? ?VE7RF? ?
|
Re: Series DC Blocking cap.
I got mine from Amp Supply and later from Bill Edwards, K4BWC (SK) who was their Service Mgr and ran Omega Electronics. After he died I bought several items from his estate.
I believe Ameritron uses them also. Check their big amps and auto tuner.
toggle quoted message
Show quoted text
----- Original Message ----- From: jim.thom@... [ham_amplifiers] To: ham_amplifiers@... Sent: Saturday, June 29, 2019 4:39 PM Subject: Re: [ham_amplifiers] Re: Series DC Blocking cap. <Teflon dielectric discs have been available for decades at least to 1000pf <and maybe higher. <Ive used them for decades when modifying amp pi networks to work into high <VSWR's on 160-80. <Carl ## where do you buy these teflon caps ? I'm looking everywhere, with not much success. Jim VE7RF --- This email has been checked for viruses by AVG.
|
Re: Series DC Blocking cap.
<Teflon dielectric discs have been available for decades at least to 1000pf?
<and maybe higher.
<Ive used them for decades when modifying amp pi networks to work into high?
<VSWR's on 160-80.
<Carl
##? where? do you buy these teflon caps ?? ? I'm looking everywhere, with not much success.?
Jim? VE7RF
|
Re: Series DC Blocking cap.
BUT there are no .02 NPO caps and there is no reason to have so much C in the RF path.
Anything over 2000pf is overkill.
toggle quoted message
Show quoted text
----- Original Message -----
From: 'Leigh Turner' invertech@... [ham_amplifiers]
To: ham_amplifiers@...
Sent: Friday, June 28, 2019 12:39 AM
Subject: RE: [ham_amplifiers] Re: Series DC Blocking cap.
Indeed they do. The current handling / rating is usually defined by the capacitor's Equivalent Series Resistance / ESR and its dielectric losses Dissipation Factor / loss tangent which is highly dielectric material dependent.
High K dielectrics tend to be lossy while NPO class dielectric leaded ceramic disk capacitors generally perform much better where significant RF current is flowing.
Leigh
VK5KLT
From: ham_amplifiers@... [mailto:ham_amplifiers@...]
Sent: Friday, 28 June 2019 1:53 PM
To: ham_amplifiers@...
Subject: Re: [ham_amplifiers] Re: Series DC Blocking cap.
Capacitors have current ratings too. Voltage is one parameter and the current rating is another.
Lee, w0vt
On 6/27/2019 11:14 PM, jim.thom@... [ham_amplifiers] wrote:
<Slightly off topic,
<I am using an old Heathkit antenna switch that has the control voltages riding on the coax. The <series DC blocking capacitor in the outside box has a piece chipped out of it. Maybe lighting, <maybe power did it. It's an .02 uf 1.6 KV disk.
<I bought a .02uf 3 KV disk Vishay and installed it. If I run a 1500 watt carrier through it for about <15 seconds, it gets warmer than lukewarm. Warmest on 10 meters as I would expect.
<Would one expect the cap to be warm to hot after that amount of time? Any suggestions on what I should put in there? Curiously, the inside control box uses two of the .02 caps in parallel, not one as the outside box does.
<Jim - KR9U
## 1500 watts = 5.5 amps into 50 ohms. That's a helluva lot of current. The problem with disc ceramic caps is.... they never post any RF current ratings on them. Ideally, they should post a CCS RF current vs freq chart. Actual current ratings are all over the map...and must be determined by testing.
## Big difference between a .01 uf @ 1 kv rated cap... vs a ..01uf @ 2 kv rated cap... the 2 kv versions are typ bigger diam, like 25mm OD... vs the smaller diam 1 kv units. The 2 kv versions, being bigger diam, handle more current..which testing confirms. Once you get to the 3+ kv rated units, they don't appear to handle any additional current, just a greater V rating.
## I bought 2 x doz .01uf @ 1.3 kv disc ceramics from RF parts last year. Huge things at 25mm OD, and really thick. These things handle loads of current, best yet so far.
## For your heath switch box application, parallel a 2nd cap in the remote switch box...then re-test. Parallel a 3rd cap if required. You should have zero heat..on any freq. Dunno if the heath box is good up to 6m or not.
Jim VE7RF
---
This email has been checked for viruses by AVG.
|
Re: Series DC Blocking cap.
Teflon dielectric discs have been available for decades at least to 1000pf and maybe higher.
Ive used them for decades when modifying amp pi networks to work into high VSWR's on 160-80.
Carl
toggle quoted message
Show quoted text
----- Original Message -----
From: 'Leigh Turner' invertech@... [ham_amplifiers]
To: ham_amplifiers@...
Sent: Friday, June 28, 2019 8:39 PM
Subject: RE: [ham_amplifiers] Re: Series DC Blocking cap.
Indeed Jim; that limitation of high Q COG / NPO material ceramic to low C
values is correct....generally limited to a few hundred pF to 1 nF or so.
Bottom line is lossy X7R, Z5U, Y5V, etc ceramic disk caps are not meant to
be used in high RF current applications....better to use multilayer RF chip
HV caps like ATC, Murata, AVX, etc. if low ESR and DF dielectric loss is
desired.
Clusters of Hi-K ceramic HV disks are quite OK for bypassing the tank plate
RFC choke, etc.
Similar issue with tank circuit padder LOAD capacitors....choose the wrong
dielectric doorknob cap and they get hot and drift in value and degrade over
time.
Leigh
VK5KLT
________________________________________
From: ham_amplifiers@... [mailto:ham_amplifiers@...]
Sent: Saturday, 29 June 2019 12:19 AM
To: ham_amplifiers@...
Subject: RE: [ham_amplifiers] Re: Series DC Blocking cap.
Posted by: jim.thom@...
LEIGH, When was the last time you ever saw a NPO .01uf DISC CERAMIC ????
They don't exist, never did. They are typ Z5u, z5t etc.
I have never seen RF current ratings for disc ceramics, rf current ratings
vs freq, nor ESR at a freq.
Jim VE7RF
From: ham_amplifiers@... [mailto:ham_amplifiers@...]
Sent: Friday, 28 June 2019 2:09 PM
To: ham_amplifiers@...
Subject: RE: [ham_amplifiers] Re: Series DC Blocking cap.
Indeed they do. The current handling / rating is usually defined by the
capacitor's Equivalent Series Resistance / ESR and its dielectric losses
Dissipation Factor / loss tangent which is highly dielectric material
dependent.
High K dielectrics tend to be lossy while NPO class dielectric leaded
ceramic disk capacitors generally perform much better where significant RF
current is flowing.
Leigh
VK5KLT
---
This email has been checked for viruses by AVG.
|
Re: Series DC Blocking cap.
Indeed Jim; that limitation of high Q COG / NPO material ceramic to low C
values is correct....generally limited to a few hundred pF to 1 nF or so.
Bottom line is lossy X7R, Z5U, Y5V, etc ceramic disk caps are not meant to
be used in high RF current applications....better to use multilayer RF chip
HV caps like ATC, Murata, AVX, etc. if low ESR and DF dielectric loss is
desired.
Clusters of Hi-K ceramic HV disks are quite OK for bypassing the tank plate
RFC choke, etc.
Similar issue with tank circuit padder LOAD capacitors....choose the wrong
dielectric doorknob cap and they get hot and drift in value and degrade over
time.
Leigh
VK5KLT
________________________________________
From: ham_amplifiers@... [mailto:ham_amplifiers@...]
Sent: Saturday, 29 June 2019 12:19 AM
To: ham_amplifiers@...
Subject: RE: [ham_amplifiers] Re: Series DC Blocking cap.
?Posted by: jim.thom@...
LEIGH, When was the last time you ever saw a NPO?.01uf? DISC CERAMIC? ?????
? They don't exist, never did.? ?They are typ Z5u, z5t etc.?
I have never seen RF current ratings for disc ceramics,?rf current ratings
vs? freq,? nor? ESR at a freq.??
Jim? ?VE7RF
From: ham_amplifiers@... [mailto:ham_amplifiers@...]
Sent: Friday, 28 June 2019 2:09 PM
To: ham_amplifiers@...
Subject: RE: [ham_amplifiers] Re: Series DC Blocking cap.
Indeed they do. The current handling / rating is usually defined by the
capacitor¡¯s Equivalent Series Resistance / ESR and its dielectric losses
Dissipation Factor / loss tangent which is highly dielectric material
dependent.
High K dielectrics tend to be lossy while NPO class dielectric leaded
ceramic disk capacitors generally perform much better where significant RF
current is flowing.
Leigh
VK5KLT
|
Re: Series DC Blocking cap.
Published current ratings and actual cap ratings may or may not
co exist.? But the fact remains an application may require a cap
with an appropriate capacitor current capability.? I have a
Johnson Valiant as an example.? It had two banks of series silver
mica capacitors in parallel.? (Factory)? One day it gave up the
ghost and I replaced it with just two in series.? Big mistake.? It
blew up.? That was the day I learned about capacitor current
ratings and why Johnson had 4 of them in there instead of one.
Lee, w0vt?
toggle quoted message
Show quoted text
?
LEIGH, When was the last time you ever saw a NPO? ?.01uf?
DISC CERAMIC? ????? ? They don't exist, never did.? ?They are typ? Z5u, z5t?
etc.?
I have never seen RF? current ratings for? disc
ceramics,? ?rf current ratings? vs? freq,? nor? ESR at a
freq.??
Jim? ?VE7RF
|
Re: Series DC Blocking cap.
LEIGH, When was the last time you ever saw a NPO? ?.01uf? DISC CERAMIC? ????? ? They don't exist, never did.? ? They are typ? Z5u, z5t? etc.?
I have never seen RF? current ratings for? disc ceramics,? ?rf current ratings? vs? freq,? nor? ESR at a freq.??
Jim? ?VE7RF
|
Re: Series DC Blocking cap.
Indeed
they do. The current handling / rating is usually defined by the capacitor¡¯s
Equivalent Series Resistance / ESR and its dielectric losses Dissipation Factor
/ loss tangent which is highly dielectric material dependent.
?
High
K dielectrics tend to be lossy while NPO class dielectric leaded ceramic disk
capacitors generally perform much better where significant RF current is
flowing.
?
Leigh
VK5KLT
?
From:
ham_amplifiers@...
[mailto:ham_amplifiers@...]
Sent: Friday, 28 June 2019 1:53 PM
To: ham_amplifiers@...
Subject: Re: [ham_amplifiers] Re:
Series DC Blocking cap.
?
Capacitors
have current ratings too. Voltage is one parameter and the current rating is
another.
Lee, w0vt
toggle quoted message
Show quoted text
On 6/27/2019 11:14 PM, jim.thom@...
[ham_amplifiers] wrote:
?
?
?
?
?
?
?
##?
1500? watts? =? 5.5 amps into? 50 ohms.? That's a
helluva lot of current.? The problem? with? disc ceramic caps
is.... they never post any RF? current ratings on them.?
?Ideally, they should post a? ?CCS? RF? current?
vs? freq chart.? ?Actual? current ratings are all over the
map...and must be? determined by testing.?
?
##?
Big difference between? a .01 uf? @ 1 kv rated cap... vs a
.01uf? @ 2 kv rated cap... the 2 kv? versions are typ bigger diam,
like 25mm? OD... vs the smaller diam? 1 kv units.?
?The? 2 kv versions, being bigger diam, handle more current..which
testing confirms.? ?Once you get to the? 3+? kv rated
units, they don't appear to handle any additional current,? just a greater
V? rating.?
?
##? I
bought 2 x doz? .01uf @ 1.3 kv? disc ceramics? from RF
parts? last year.? Huge things at? 25mm? OD, and really
thick.? ?These things handle loads of current, best yet so far.?
?
##
For? your heath switch box application,? parallel a 2nd cap? in
the remote switch box...then re-test.? ?Parallel a 3rd cap if
required.? ?You should have zero heat..on any freq.? Dunno if
the heath? box is? good up to 6m or not.? ?
?
Jim?
?VE7RF
|
Leigh Turner