In Canada, we use both SAE and Metric.? I use strictly SAE for machine screws,? nuts and bolts, and hardware for ant stuff etc, etc.? ?I avoid metric like the plague.?
However,? cars are all metric, including cars built in the usa.?
Metric came out in Canada, after I had left school.? ?I still can't relate to it.? ? I have to mentally convert it for everything.? ?80 kmh ?? ?Oh, that's 51 mph, ok, I know how fast I'm going.? ?20C? is? 68F.... ok, now I know how warm / cold it is.? ?Fuel milage is? Liters per 100 km...(62 miles) ..... instead of miles per imperial / US gallon.?
?100 mm? = 10 cm =? aprx 4".? 25.4 mm = 1"? ? 1/4" = 6.35 mm.?
I asked my son one day to get me a short length of? 2x4.? ?(A 2x4? is a piece of wood that is 1.5"? thick x 3.5"? wide).? ?He comes back with a 12" square piece of? 1/2" thick plywood.? WTF ?? "What the hell are u doing"? ? He sez......' How many CM is that ? '? ?F#@K, I don't know Josh.? ? I wasn't abt to convert 1.5"? to cm....and ditto with 3.5"? to? cm.??
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Re: CTR Engineering/W8JI Response?
Really ??
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Show quoted text
On 2025-03-16 09:06, Peter Voelpel wrote: Read the question.
-----Original-Nachricht-----
Betreff: Re: [ham-amplifiers] CTR Engineering/W8JI Response?
Datum: 2025-03-16T12:18:34+0100
Von: "Amp Guy Llc" <kb1sel@...>
An: "[email protected]" <[email protected]>
We have more ??
And more to come
Will be around for a very long time, im 43
Eventually we will be winding plate chokes and selling parts for
Ameritron pa’s
On 2025-03-15 08:54, Steve wrote:
Harbach doesn't have the goodies he has.
On 3/15/2025 2:56 AM, Amp Guy Llc wrote:
FYI
Harbachelectronics.com items ship the next business day On
2025-03-15 00:56, Steve wrote:
For those who have ordered from CTR recently: how long did it take
to
receive a response? Also, I could not find anything on his web
site
regarding tax or shipping costs; I presume he states those in his
response, along with his desired payment method(s)?
TNX,
Steve K0XP --
See my QRZ.com page at
Links:
------
[1] /g/ham-amplifiers/message/41084
[2] /mt/111713302/8135091
[3] /g/ham-amplifiers/post
[4] /g/ham-amplifiers/editsub/8135091
[5]
/g/ham-amplifiers/leave/12941173/8135091/773995006/xyzzy ?
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Re: CTR Engineering/W8JI Response?
Read the question. -----Original-Nachricht----- Betreff: Re: [ham-amplifiers] CTR Engineering/W8JI Response? Datum: 2025-03-16T12:18:34+0100 Von: "Amp Guy Llc" <kb1sel@...> An: " [email protected]" < [email protected]> We have more ?? And more to come Will be around for a very long time, im 43 Eventually we will be winding plate chokes and selling parts for Ameritron pa’s On 2025-03-15 08:54, Steve wrote: Harbach doesn't have the goodies he has.
On 3/15/2025 2:56 AM, Amp Guy Llc wrote:
FYI
Harbachelectronics.com items ship the next business day On
2025-03-15 00:56, Steve wrote:
For those who have ordered from CTR recently: how long did it take
to
receive a response? Also, I could not find anything on his web
site
regarding tax or shipping costs; I presume he states those in his
response, along with his desired payment method(s)?
TNX,
Steve K0XP --
See my QRZ.com page at
Links:
------
[1] /g/ham-amplifiers/message/41084
[2] /mt/111713302/8135091
[3] /g/ham-amplifiers/post
[4] /g/ham-amplifiers/editsub/8135091
[5]
/g/ham-amplifiers/leave/12941173/8135091/773995006/xyzzy ?
|
> It's? 6-32 hardware.? ?6-32 has a? .138" diameter thread (3.51 mm).? ? The 32 means it has 32 threads per inch.? ? Thank you very much for the information. I'll be able to purchase the nuts. ? In Canada, do you commonly use US or metric screws (like everyone else :)? ? To answer, I circled the nut in the attached image. -- F1AMM Fran?ois De la part de Jim VE7RF via groups.io
贰苍惫辞测é?: dimanche 16 mars 2025 12:38
_._,_._,_
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It's? 6-32 hardware.? ?6-32 has a? .138" diameter thread (3.51 mm).? ? The 32 means it has 32 threads per inch.?
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Are you referring to the screws that mount the tube sockets?? Common thread sizes are 6-32, 8-32 and 10-32 or 10-24 . Mike
Hello ? On my Drake amplifier, I would like to install additional hardware using existing threaded rods (3-500Z support spacers). If I measure the thread diameter, I get a reading of 3.3 mm (1/7 inch). The existing nuts measure 6.1 mm (1/4 inch) across the flat. ? Can you tell me the US thread size for this type of thread? ? -- F1AMM Fran?ois
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Re: CTR Engineering/W8JI Response?
We have more ??
And more to come
Will be around for a very long time, im 43
Eventually we will be winding plate chokes and selling parts for Ameritron pa’s
toggle quoted message
Show quoted text
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Hello ? On my Drake amplifier, I would like to install additional hardware using existing threaded rods (3-500Z support spacers). If I measure the thread diameter, I get a reading of 3.3 mm (1/7 inch). The existing nuts measure 6.1 mm (1/4 inch) across the flat. ? Can you tell me the US thread size for this type of thread? ? -- F1AMM Fran?ois
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Re: Total insanity....500KW 11m amp being built.
Little mistakes at those Power Levels goes BOOOOOOMMMMMMM !
Hi Jim,
Your're exactly right!?? i agree, the Only way is grid drive.?? Thanks for taking time do the math and and expose the massive plate? current on peaks.
Regardless, it's a crazy project but we are getting to exercise our imagination and exploring the limits of big steel tubes.
73's, Mike?
VK6ADA
Mike, where are they gonna obtain a modulation xfmr ??? ? Per the? Eimac spec sheet for plate modulated AM,? ?the secondary of the modulation xfmr would have? 15 kvdc across it...and 23.4 amps? flowing through the sec of the modulation xfmr.? ?The 15 kv across the modulation xfmr will rvs in polarity.....and the sec of the mod xfmr is in series with the 15 kv? B+.? ? And that's just for 100%? positive modulation.
IE:? the B+ would? swing to? +30 kv? on positive mod peaks..... and down to 0 volts? on negative peaks.?
15 kv? @ 11.7 amps = 175.5 kw modulation xfmr.? ?At the crest of the positive modulation,? B+ on the anode? is now? 30 kv....and plate current is now double at 23.4 amps.?
Let's assume plate modulation is not happening any time soon.?
They shoulda just run it grid driven, for linear service? like on the spec sheet.? ?200 kw pep out, and 50 kw cxr......which? swings to 75 kw.? ?That's 25 kw of total swing....( 25 kw of? total sideband power)..., with just 12.5 kw into each sideband.?
Still a wasted effort.? The 3x6 amp puts out 12.5 kw pep on ssb.?
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Re: Total insanity....500KW 11m amp being built.
Hi Jim,
Your're exactly right!?? i agree, the Only way is grid drive.?? Thanks for taking time do the math and and expose the massive plate? current on peaks.
Regardless, it's a crazy project but we are getting to exercise our imagination and exploring the limits of big steel tubes.
73's, Mike?
VK6ADA
Mike, where are they gonna obtain a modulation xfmr ??? ? Per the? Eimac spec sheet for plate modulated AM,? ?the secondary of the modulation xfmr would have? 15 kvdc across it...and 23.4 amps? flowing through the sec of the modulation xfmr.? ?The 15 kv across the modulation xfmr will rvs in polarity.....and the sec of the mod xfmr is in series with the 15 kv? B+.? ? And that's just for 100%? positive modulation.
IE:? the B+ would? swing to? +30 kv? on positive mod peaks..... and down to 0 volts? on negative peaks.?
15 kv? @ 11.7 amps = 175.5 kw modulation xfmr.? ?At the crest of the positive modulation,? B+ on the anode? is now? 30 kv....and plate current is now double at 23.4 amps.?
Let's assume plate modulation is not happening any time soon.?
They shoulda just run it grid driven, for linear service? like on the spec sheet.? ?200 kw pep out, and 50 kw cxr......which? swings to 75 kw.? ?That's 25 kw of total swing....( 25 kw of? total sideband power)..., with just 12.5 kw into each sideband.?
Still a wasted effort.? The 3x6 amp puts out 12.5 kw pep on ssb.?
|
Re: Total insanity....500KW 11m amp being built.
Mike, where are they gonna obtain a modulation xfmr ??? ? Per the? Eimac spec sheet for plate modulated AM,? ?the secondary of the modulation xfmr would have? 15 kvdc across it...and 23.4 amps? flowing through the sec of the modulation xfmr.? ?The 15 kv across the modulation xfmr will rvs in polarity.....and the sec of the mod xfmr is in series with the 15 kv? B+.? ? And that's just for 100%? positive modulation.
IE:? the B+ would? swing to? +30 kv? on positive mod peaks..... and down to 0 volts? on negative peaks.?
15 kv? @ 11.7 amps = 175.5 kw modulation xfmr.? ?At the crest of the positive modulation,? B+ on the anode? is now? 30 kv....and plate current is now double at 23.4 amps.?
Let's assume plate modulation is not happening any time soon.?
They shoulda just run it grid driven, for linear service? like on the spec sheet.? ?200 kw pep out, and 50 kw cxr......which? swings to 75 kw.? ?That's 25 kw of total swing....( 25 kw of? total sideband power)..., with just 12.5 kw into each sideband.?
Still a wasted effort.? The 3x6 amp puts out 12.5 kw pep on ssb.?
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SVHFS Presenters & Conference Update
Below is an update on the schedule of speakers and presentations for the Southeastern VHF Society Conference. The conference will be held at the Quality Inn at Exit #4 in Clarksville, TN April 4-5, 2025. This is an opportunity to meet other VHF+ enthusiasts, learn, exchange ideas, and have FUN. The $69 registration fee for the?conference is required, and it includes a 1 year membership in the SVHFS. Details are here:?. Advance registration?is highly recommended as the hotel requires a head count in order to prepare the food for the event. There will be door prizes given away at the banquet on Saturday evening. Feel free to contact me??via?email if you have any questions:? RobinK4IDC@....
Preliminary 2025 SVHFS Conference Schedule Friday 8:00 AM Registration 9:00 Charles Osborne -K4CSO – RF Zero - 30 min 9:30 Robin Midgett – K4IDC – RF Zero 2 Meter Beacon- 30 min 10:00 Bob Lear – W4ZST Power Dividers and Cable Loops – 30 min 10:30 15 Minute Break 10:45 Mike Stipick – KC4RI – 5.7 GHz SDR Transceiver - 45 min 11:30 Bill Pence – Grid Square Locator – 30 min 12:00 PM Lunch - Steve and Sandra Kostro – Designing a Multi Band Transverter 1:15 2:00 Paul Wielozenski - K4PEW - VHF Nets – 30 min 2:30 Ben Lowe – Rover Radiators – 30 min 3:00 George Presley – 10 GHz Beacon – 30 min 4:00 Charles Osborne / Kent O’ Dell – 10GHz Antenna test Range - 30 min 5:00 Dinner –On your own 7:00 Swap Fest and Hospitality Suite Saturday 9:00 AM Brian McCarthy – Lunar Rover Truck, 2.3GHz Amp – 1 hour 10:00 Peter Van Horne – KA6U - Moon Bounce Rover – 45 min 10:45 15 Minute Break 11:00 Chris Arthur - NV4B – 45 min 12:00 PM Lunch - On your own 1:30 Larry Cagle - K4WLO – Meteor Scatter with MSK144 - 45 min 2:15 SVHFS Business Meeting 3:00 – 5:00 Rover Round Up and 10GHz Antenna Range 6:00 Social Hour- Hotel Bar 7:00 Dinner Banquet followed by the Door Prize Extravaganza!?
Thanks,
Robin Midgett K4IDC
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Re: CTR Engineering/W8JI Response?
Harbach doesn't have the goodies he has.
On 3/15/2025 2:56 AM, Amp Guy Llc
wrote:
FYI
Harbachelectronics.com items ship the next business day On
2025-03-15 00:56, Steve wrote:
For those who have ordered from CTR
recently: how long did it take to
receive a response? Also, I could not find anything on his web
site
regarding tax or shipping costs; I presume he states those in
his
response, along with his desired payment method(s)?
TNX,
Steve K0XP
--
See my QRZ.com page at
|
Re: CTR Engineering/W8JI Response?
I’ve tried ordering from him in the past by emailing him as requested on his website. I never received a reply also.
Chuck. K1KW
Sent by radio waves
toggle quoted message
Show quoted text
On Mar 15, 2025, at 5:56 AM, Amp Guy Llc <kb1sel@...> wrote:
?FYI
Harbachelectronics.com items ship the next business day On 2025-03-15 00:56, Steve wrote:
For those who have ordered from CTR recently: how long did it take to
receive a response? Also, I could not find anything on his web site
regarding tax or shipping costs; I presume he states those in his
response, along with his desired payment method(s)?
TNX,
Steve K0XP
|
Re: CTR Engineering/W8JI Response?
FYI
Harbachelectronics.com items ship the next business day On 2025-03-15 00:56, Steve wrote:
toggle quoted message
Show quoted text
For those who have ordered from CTR recently: how long did it take to
receive a response? Also, I could not find anything on his web site
regarding tax or shipping costs; I presume he states those in his
response, along with his desired payment method(s)?
TNX,
Steve K0XP
|
Re: CTR Engineering/W8JI Response?
TNX, Alek!
73, Steve K0XP
On 3/15/2025 12:02 AM, Alek Petkovic
via groups.io wrote:
Hi
Steve.
I have found that Tom has a lot on his plate but he will get
around to your order or email enquiries as soon as he can. CTR
Engineering is pretty much a one man show.
Yes, shipping costs are calculated and advised specifically for
your order.
Bieing retired and in Australia, I accept that everything takes
time, so I don't mind if it takes a while before he can address my
questions or order. I'm very patient.
Anyway, his stuff is all very good and well worth the wait.
73, Alek VK6APK.
On 15/03/2025 2:56 pm, Steve wrote:
For those who have ordered from CTR
recently: how long did it take to
receive a response? Also, I could not find anything on his web
site
regarding tax or shipping costs; I presume he states those in
his
response, along with his desired payment method(s)?
TNX,
Steve K0XP
--
See my QRZ.com page at
|
Re: CTR Engineering/W8JI Response?
Hi Steve.
I have found that Tom has a lot on his plate but he will get around to your order or email enquiries as soon as he can. CTR Engineering is pretty much a one man show.
Yes, shipping costs are calculated and advised specifically for your order.
Bieing retired and in Australia, I accept that everything takes time, so I don't mind if it takes a while before he can address my questions or order. I'm very patient.
Anyway, his stuff is all very good and well worth the wait.
73, Alek VK6APK.
toggle quoted message
Show quoted text
On 15/03/2025 2:56 pm, Steve wrote: For those who have ordered from CTR recently: how long did it take to
receive a response? Also, I could not find anything on his web site
regarding tax or shipping costs; I presume he states those in his
response, along with his desired payment method(s)?
TNX,
Steve K0XP
|
CTR Engineering/W8JI Response?
For those who have ordered from CTR recently: how long did it take to
receive a response? Also, I could not find anything on his web site
regarding tax or shipping costs; I presume he states those in his
response, along with his desired payment method(s)?
TNX,
Steve K0XP
|
12 KW CCS ON 160-15M....USING THE 3CX-6000A7..... PART 22
12 KW CCS ON 160-15M....USING THE 3CX-6000A7..... PART 22
Here, the series bank of 2500 uf @ 450 vdc lytics is uniquely wired up, in it's final config.? The ring terminal / spade lug is lopped off a sta-kon crimp connector, leaving just the barrel.? ?The barrel is then slid over the round pins of the lytics.? ?16 ga silver / stranded / teflon wire is inserted into the barrel, along with the solid 16 ga (.052")? lead of a 6 amp RVS connected diode, and also one end of the 100K? @ 3 watt MOF EQ resistor.? (1% Tolerance).? ?The resistors? all measure exactly? 99,800 ohms.? On paper, the V drop across each lytic should be identical. (375 vdc).? Diss in each resistor is 1.4 watts.
The function of the RVS connected diode across each cap, is in the unlikely event that if one leg of the main FWB rectifier assy failed shorted, you would end up with a condition whereby raw AC? from the plate xfmr sec, would be pumped into the string of lytics, causing severe damage to them.? ?The RVS connected diodes in this case, would conduct, bypassing the caps.... and taking out the HV fuse #2.
?(located between? sec of plate xfmr and input to fwb).? ?The replacement costs for those lytics is very expensive. (non issue if an oil cap was used)
After? crimping, the? tops and bottoms of each barrel are then soldered.? This makes for a 100%? solid connection, both mechanically and electrically.? ?
Originally, those lytics were designed to be mounted to a PC board.? The 3rd (un-used) pin was to make for a small tripod, for better support.? ?In this application,? the caps are inverted, and mounted with nylon capacitor clamps.? ?The 330 cfm (filtered) intake air will 1st pass? by the caps,? before going into the planum of the RF deck.?
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Re: Total insanity....500KW 11m amp being built.
Anytime a radiator is initially filled, like in a car, it's? typ? vac filled.? ?The last thing you want is trapped air? anywhere in the loop.? ?That would be a disaster on a 100 kw water cooled tube.? ?I'm assuming the large air cooled radiator will be outside the shop, ( to dump the heat to the outside)..... so lengthy water lines? will be involved.? IE: the total loop distance has increased.?
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Mike Peace
Robin Midgett