Re: PSUD2 - last updated 22/11/2019
oops.? That? shoulda? read Version 2.10.0
Jim? VE7RF
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Re: PSUD2 - last updated 22/11/2019
LATEST? VERSION? IS? 3.78
Jim? VE7RF
|
PSUD2 - last updated 22/11/2019
Latest? version? of the? infamous? PSUD2 is? superb,? very? accurate results.....and a host? of new? user? friendly? features.?
Jim? ?VE7RF
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Re: Plate blocking caps YC156
In the 70s, toured US Naval Radio Station, Oso, WA (aka "Jim Creek"). At the time, they were pushing 1296A into 0.456¦¸ (766 kW). They dump the waste heat into Jim Creek. We were told that the creek temperature rises 1¡ã when they have the transmitter cranked up to +3 dBM (2 MW). Oy!
Bryan WA7PRC
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Re: Plate blocking caps YC156
Yeah, that would be a lovely thing to see.
Biggest I've seen here is MW AM broadcast station 6WA, on 558kHz.
100 miles East of me. It was 50kW and it was a walk in
transmitter. As a young lad, I got to see it a couple of times, as
VK6IQ was one of the engineers working there.
Of course it is now a modular solid state job and all automated.
You should be able to hear it from your joint if the time of
day/night is right.
73, Alek
On 2/01/2020 11:35 pm, Carl wrote:
toggle quoted message
Show quoted text
?
You ought to look in to a BIG
Continental or other US amp if you want to see quality.
?
BIG starts at 100KW
?
Carl
----- Original Message -----
Sent: Monday, December 30,
2019 10:03 PM
Subject: Re:
[ham-amplifiers] Plate blocking caps YC156
Yeah. The anti corona balls on the screws on the switch wafer
are something else too.
What superb engineering by the RF? Gods R&S.
Just look at that? excellent bandswitch and finger stock
contacts. Their older test equipment aslo? has such displays
of excellence in engineering. I can only imagine what their
amplifiers look like inside. I wonder if Rohde&S made a
autotine HF amplifer like the Collinas HF8022? I have seen?
Marconi copy of the HF8022. The only difference was the
cabinet color.
Henry
|
Re: Plate blocking caps YC156
?
You ought to look in to a BIG Continental or other
US amp if you want to see quality.
?
BIG starts at 100KW
?
Carl
----- Original Message -----
Sent: Monday, December 30, 2019 10:03
PM
Subject: Re: [ham-amplifiers] Plate
blocking caps YC156
Yeah. The anti corona balls on the screws on the switch wafer are something
else too.
What
superb engineering by the RF? Gods R&S. Just look at that?
excellent bandswitch and finger stock contacts. Their older test equipment
aslo? has such displays of excellence in engineering. I can only
imagine what their amplifiers look like inside. I wonder if Rohde&S made
a autotine HF amplifer like the Collinas HF8022? I have seen? Marconi
copy of the HF8022. The only difference was the cabinet color.
Henry
|
Re: Plate blocking caps YC156
Hi Jim
Thanks for those tips. I have ordered the HT57's
You dont have the?? changes required for the GM3SEK triode board to use it with the YC156? I have a board set up for a 8877 but there is no details for the YC156? changes in his manual. I can see the mods for the higher bias voltage which I have already done. Is there anything else that has to be done to this board for the YC156?
Henry
|
Re: Plate blocking caps YC156
Don't? use? fixed? vac? caps? for? plate? blockers.? With B+? ?on? one? side? of? the? vac? cap, it? has to? be? severely? de-rated.? ?As is,? a 15? kv? rated? vac? cap? is? only? good for? 9? kv? with? RF on? it.?
(RF? rating is? ?60%? of? stamped? rating).? ? Toss? B+? on? top? of? that,? and? it's? now? down? to 5.4 KV.? ?11m? ops? have? already tried? it,? typ? a fixed? ceramic,? 25? kv? jennings cap? is used,? 2000? pf.?
Same? issues.??
I? see? the? R+S? tuner? has a? blower included.? Entire? unit? weighs 1980? lbs !? ? ?It's? 59"? x? 47.25"? x? 39.37"? ? That? mica? cap? is >? 1'? long.? ?Dunno? where? all? the? weight? is ????
This? is? all? for a single wire? tuner, judging? by? the? huge? bowl insulator.....? like? to? feed? the? base? of? ship? board? 35'? tall? verticals? from? ?2-30? mhz.? For? 1249? euro's,? Peter? should? buy? it? for? bragging rights.?
4 x? HT-57's? is? ample? for the? proposed? YC-156.? ?Order the? 200? pf? version.??
Jim? ?VE7RF
|
Re: Plate blocking caps YC156
Yeah. The anti corona balls on the screws on the switch wafer are
something else too.
toggle quoted message
Show quoted text
What superb engineering by the RF? Gods R&S. Just look at
that? excellent bandswitch and finger stock contacts. Their older
test equipment aslo? has such displays of excellence in
engineering. I can only imagine what their amplifiers look like
inside. I wonder if Rohde&S made a autotine HF amplifer like
the Collinas HF8022? I have seen? Marconi copy of the HF8022. The
only difference was the cabinet color.
Henry
|
Re: Plate blocking caps YC156
Hi Jim
I will order some HT57's from RFparts. I wont take a gamble with the Chinese copies since they similar in price. I? order 5.
I cant find any other caps with RF current ratings for the higher frequencies. RF parts only has rf current data for the HEC caps. Murata and Toshiba dont make RF ceramic capacitors anymore.? Thompson used to make some good capacitors but they? have stopped as well.? So this just leave the HEC, Dralorics(China) and the Chinese manufacturers. I suppose the?? ultimate option would be a fixed vacuum capacitor. I like HEC's because they will make a compact assembly.
|
Re: Plate blocking caps YC156
What superb engineering by the RF? Gods R&S. Just look at that? excellent bandswitch and finger stock contacts. Their older test equipment aslo? has such displays of excellence in engineering. I can only imagine what their amplifiers look like inside. I wonder if Rohde&S made a autotine HF amplifer like the Collinas HF8022? I have seen? Marconi copy of the HF8022. The only difference was the cabinet color.
Henry
|
Re: Dielectric grease for roller inductors ?
?
OEP still makes variable caps and all the TX
variety use that grease/goo/goop
?
?
?
----- Original Message -----
Sent: Monday, December 30, 2019 7:55
PM
Subject: Re: [ham-amplifiers] Dielectric
grease for roller inductors ?
Oren Elliott? no? longer makes? rollers...?
just? ?air? variables +?
verniers.??
I'm? gonna? buy?
some...'conducto? lube' .? ? 75%? pure? silver...and
25%? castor oil.? ?Made for? sliding? contacts.
I? use? High? tech? 3M? air? filters?
?on? the? air? intake? to? both? hb
amps.? ?Sealed on? top? side...except for?
exhaust.? ? Zero? dust.? ?
My? ?4 x
gold? contacts? ?pinch? and slide on? the? sides
of the? 3/8" silver? plated? ribbon.? ?It?
needs? lube.?
Center? bar? is 1"?
square,? silver plated? ?square tubing,? ?with
more? sliding contacts (8) on? all? 4? x sides.?
?And? still? more? sliding contacts (4)?
?at? each? end? of? the? sq tubing..where?
they? brazed? on silver? plated?
discs.?
Jim? VE7RF
|
Re: Dielectric grease for roller inductors ?
Oren Elliott? no? longer makes? rollers...? just? ?air? variables +? verniers.??
I'm? gonna? buy? some...'conducto? lube' .? ? 75%? pure? silver...and 25%? castor oil.? ?Made for? sliding? contacts.
I? use? High? tech? 3M? air? filters? ?on? the? air? intake? to? both? hb amps.? ?Sealed on? top? side...except for? exhaust.? ? Zero? dust.? ?
My? ?4 x gold? contacts? ?pinch? and slide on? the? sides of the? 3/8" silver? plated? ribbon.? ?It? needs? lube.?
Center? bar? is 1"? square,? silver plated? ?square tubing,? ?with more? sliding contacts (8) on? all? 4? x sides.? ?And? still? more? sliding contacts (4)? ?at? each? end? of? the? sq tubing..where? they? brazed? on silver? plated? discs.?
Jim? VE7RF
|
Re: Dielectric grease for roller inductors ?
Scroll? to? extreme? right.? ?'Grease'
PRODUCT DETAILS
Two (2) graphite-lithium grease packets for use on all Palstar roller inductors. The grease is free. The handling fee is $3.45 and shipping cost is $0.50 via USPS.
|
Re: Plate blocking caps YC156
Youre easily aroused
?
?
?
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Show quoted text
----- Original Message -----
Sent: Sunday, December 29, 2019 8:15
PM
Subject: Re: [ham-amplifiers] Plate
blocking caps YC156
I've got wood!
On 30/12/2019 12:46 am, Peter Voelpel
wrote:
Rohde & Schwarz
uses no other type of capacitor then mica for their
atus.
On the photo you
see a 200pf mica by Jahre in their 20KW tuner.
73
Peter
The? problem?
with? broadcast? ?mica's (or? any? mica)?
is? they? won't handle? ?any current? on?
higher? freqs.? But? they are? NPO.? ?Drake
used switchable mica's? in their? MN-2000? ant? tuner
(along? with? 2 x air? variables).? ?Drake?
used? 7 (SEVEN)? ?mica's? in?
parallel....just? for 10m? band.....just to handle 1200w? pep
into? some? swr.? ?
Drake? used? a
single? 700 pf? (NPO) mica? to? pad? the 1600?
pf? load? cap on? 80m band....? on their L4B?
80-10? amp.?
Those CDE and? similar? mica?
caps? are? typ rated? at? ?1? mhz?
for? max current.? > 6? mhz, they? have?
fallen? off really? fast.? >20? mhz,? they?
are? down? to? nothing.?
Mica's? work?
superb? on? low? bands (<6 mhz)....? and
ceramic? caps work? superb? >2-3
mhz.?
For? a plate? block? cap, ceramic?
is? used,? since? we? require? a cap(s) that?
will? handle loads? of? current on? 21-29.7? mhz.
(+6M).? ? On lower? bands,? plate? block?
cap? current? drops? way? off.....non?
issue.
HEC? is? still made? in PA...amish?
country.??
Download?
the? main? catalog for? CERAMIC? ??
Draloric
is? still? made in? germany.?
Centralab?
was? bought? out? by? ITT-Jennings.?
Centralab? (ITT-Jennings)? ? 857 /? 859? is?
the? same? as a HEC? ?HT-57? /?
HT-59?
Everything? else? is? a chinese
copy.? ?Also? factor? in? the? heat?
from? the? anode? will? travel? down? the
strap..to? one? side? of? plate block?
caps.?
Jim?
?VE7RF
|
Re: Plate blocking caps YC156
Well, 4 HT-57's will be OK for a 8877 running hard. I use 6 for a 3CX1000A7 on 2M at 1500W. No drift
Carl
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----- Original Message ----- From: tardivat@... To: [email protected]Sent: Sunday, December 29, 2019 12:31 AM Subject: Re: [ham-amplifiers] Plate blocking caps YC156 Thanks for all the suggestions. The HT57's look like the easiest capacitors to get. Are HT57's now being made in China by HyEnergy? I see a lot of what looks like clone HT57's for sale on that Auction site. The last thing I want is a crap capacitor failing because I was too cheap to buy the real thing. Peter have you tried those Chinese Capacitors. I know that Draloric capacitors are now manufactured in China and that looks like a Draloric capacitor? I have couple of monster CDM Type 293 1200pf 15kv 15 Amps broadcast micas. Rated at 1mhz. I dont know what the current handling is at 30mhz? These are monsters 3.5 inc by 2.5 inches. Alek, I looked at the web page and found a couple that might be suitable. The K15U-1 15kV 470pF 40kVAR capacitors. They just look bulk and messy to strap them together. 4 x HT57S's strapped together would make a compact assembly as Jim has suggested. Thanks for all the tips Jim. Anyway thanks for the suggestions Henry
|
Re: Dielectric grease for roller inductors ?
I'm guilty too.... tune my roller inductor with 10 watts or so RF.
Never "fine tune" with QRO... just null with the capacitors. The noise bridge would be a much better solution.
Don W4DNR
Quoting "Cliff Fox (KU4GW)" <cliffku4gw@...>:
toggle quoted message
Show quoted text
I've been using a Palstar AT1500CV roller inductor antenna tuner to tune my
260 feet 450 ohm ladder line fed doublet antenna with since 2002 and
Palstar makes no recommendations at all in the user manual about using any
type of dieletric grease or any type of lubricant on the roller inductor.
It does tell how to clean it. I clean it every 3 or 4 months when I blow
the dust out of my Ameritron AL-80B amplifier. I use those little alcohol
pads like I use for my diabetes tests and insulin injections to clean it
with. They do say to make sure to not leave any fluid or anything on the
inside of the turns on the inductor so I just wipe the outside of the turns
and the small brass wheel that runs on the inductor turns until I get a
clean pad. Usually there's a little bit of black dirt on them when I clean
it. WA4GEG, Byron Campbell, who specializes in repair of Yaesu FT-1000MP
line of transceivers recommends not using a roller inductor tuner at all
because he says not getting a good connection can damage the T/R relay
which is what was wrong with my Mark-V. He recommends using a noise bridge
instead. I've been using my MFJ-259B antenna analyzer hooked up to a
MFJ-1700B coax switch box that accepts up to 6 transmitters and 6 antennas
as if it's a transmitter itself and then tuning the Palstar tuner settings
for the match and it works great! Once I get a match I always write the
settings down in a little book I made of 3" x 5" index cards stapled
together on one side. When I return to that same frequency again I can
usually tune up with those settings and get a match in under 5 seconds!
Happy New Years and very 73!
Cliff, KU4GW
On Sat, Dec 28, 2019 at 1:35 PM Jim VE7RF <jim.thom@...> wrote:
I have a RI-40 ribbon style (3/8" x .082") roller coil....with no
lube on it. Can I use permatex dielectric grease on it ?
My RI-50 roller coil came with what appears to be green coloured
grease on it.
Both rollers have the ribbon pinched with a pair of gold plated
contacts, 2 per side. Coil is fixed. Contacts spiral around the
inside.
SSON no longer sells either version. I bought the RI-50 new,
years ago. The RI-40 was obtained used.
Jim VE7RF
|
Re: Plate blocking caps YC156
Hi, All-
I have followed this discussion on plate blocking caps with great interest.
Just wondering if anyone in the group might have a copy of old Sprague
literature that might have the specs on some caps I have here-
p/n 399A259. They are marked "2500MMFD- 5KVAC". I've been told
they can handle around 30KVDC. I did check them quickly with my
hipot tester and they were fine at the max on that instrument, around
14KV. Mine seem to be surplus/seconds, possibly used. Big 1/4-20
male and female studs on them. Around 2in tall and over 2in dia.
Encapsulated in epoxy, it looks like. Some measured a bit low on
capacitance, as low as about 1800pF on a couple. The caps are not
marked as to capacitance tolerance. All were low, no big deal to me.
Best pair were around 2200pF on my AADE cap meter. Usage here
would be strictly HF, mostly the low bands. 10 meters is pretty
useless right now.
These are a real hoss of a capacitor, looks like, but I'd be interested
in knowing how they were spec'ed as to RF current vs. frequency.
Likely to find their way into some amplifiers running 4 to 6KV anode
voltage. I'm really not contemplating running multiples of these-
I think a single cap would suffice for anything I'm planning on doing
with them. Some might be fairly high plate impedance, running
higher supply voltages with relatively lower anode currents. Pi-L
output networks. Date codes on these caps are typically "63nn"
1960's manufacture.
All specs/comments/advice welcome- thanks, guys!
73, David K3KY
|
Re: Dielectric grease for roller inductors ?
I've been using a Palstar AT1500CV roller inductor antenna tuner to tune my 260 feet 450 ohm ladder line fed doublet antenna with since 2002 and Palstar makes no recommendations at all in the user manual about using any type of dieletric grease or any type of lubricant on the roller inductor. It does tell how to clean it. I clean it every 3 or 4 months when I blow the dust out of my Ameritron AL-80B amplifier. I use those little alcohol pads like I use for my diabetes tests and insulin injections to clean it with. They do say to make sure to not leave any fluid or anything on the inside of the turns on the inductor so I just wipe the outside of the turns and the small brass wheel that runs on the inductor turns until I get a clean pad. Usually there's a little bit of black dirt on them when I clean it. WA4GEG, Byron Campbell, who specializes in repair of Yaesu FT-1000MP line of transceivers recommends not using a roller inductor tuner at all because he says not getting a good connection can damage the T/R relay which is what was wrong with my Mark-V. He recommends using a noise bridge instead. I've been using my MFJ-259B antenna analyzer hooked up to a MFJ-1700B coax switch box that accepts up to 6 transmitters and 6 antennas as if it's a transmitter itself and then tuning the Palstar tuner settings for the match and it works great! Once I get a match I always write the settings down in a little book I made of 3" x 5" index cards stapled together on one side. When I return to that same frequency again I can usually tune up with those settings and get a match in under 5 seconds!?
Happy New Years and very 73!?? Cliff, KU4GW
On Sat, Dec 28, 2019 at 1:35 PM Jim VE7RF < jim.thom@...> wrote: I? have a RI-40 ribbon? style (3/8"? x .082")? roller? coil....with? no? lube on? it.? ? Can? I? use? permatex? dielectric? grease? on? it ?
My? RI-50 roller? coil? came? with? what? appears to be? green? coloured? ?grease on? it.?
Both? rollers? have the? ribbon? pinched? with a pair of? gold? plated? contacts,? 2? per? side.? ?Coil? is? fixed.? ?Contacts? spiral? around? the inside.
SSON? no? longer? sells? either? version.? ?I? bought the? RI-50? new,? years? ago.? The? RI-40 was obtained? used.? ? ?
Jim? VE7RF
|
Re: Plate blocking caps YC156
Weight of that tuner is 900kg!
?
?
73
Peter
?
?
I've got
wood!
toggle quoted message
Show quoted text
On 30/12/2019 12:46 am, Peter Voelpel wrote:
Rohde & Schwarz uses no other type of
capacitor then mica for their atus.
On the photo you see a 200pf mica by Jahre
in their 20KW tuner.
?
73
Peter
?
?
?
The? problem?
with? broadcast? ?mica's (or? any? mica)?
is? they? won't handle? ?any current? on?
higher? freqs.? But? they are? NPO.? ?Drake used
switchable mica's? in their? MN-2000? ant? tuner
(along? with? 2 x air? variables).? ?Drake?
used? 7 (SEVEN)? ?mica's? in? parallel....just?
for 10m? band.....just to handle 1200w? pep into? some? swr.?
?
Drake? used? a single? 700 pf? (NPO) mica? to?
pad? the 1600? pf? load? cap on? 80m band....? on
their L4B? 80-10? amp.?
Those CDE and? similar? mica? caps? are? typ
rated? at? ?1? mhz? for? max current.? >
6? mhz, they? have? fallen? off really? fast.?
>20? mhz,? they? are? down? to? nothing.?
Mica's? work? superb? on? low? bands (<6
mhz)....? and ceramic? caps work? superb? >2-3
mhz.?
For? a plate? block? cap, ceramic? is? used,?
since? we? require? a cap(s) that? will? handle
loads? of? current on? 21-29.7? mhz. (+6M).? ? On
lower? bands,? plate? block? cap? current?
drops? way? off.....non? issue.
HEC? is? still made? in PA...amish? country.??
Download? the? main? catalog for? CERAMIC? ??
Draloric is? still? made in? germany.?
Centralab? was? bought? out? by? ITT-Jennings.?
Centralab? (ITT-Jennings)? ? 857 /? 859? is?
the? same? as a HEC? ?HT-57? /? HT-59?
Everything? else? is? a chinese copy.? ?Also?
factor? in? the? heat? from? the? anode?
will? travel? down? the strap..to? one? side?
of? plate block? caps.?
Jim? ?VE7RF
|
