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Re: Coil 3.72 software
开云体育Ah. I think I have it! I was waiting for the fields to clear when I clicked on the
arrow/s. For some reason, they don't but it is ok, because you
just have to type over the existing numbers. Found it by accident. Never would have guessed in a million years otherwise. Thanks and 73, Alek. On 9/01/2020 12:16 am, Jim VE7RF wrote:
Did? u? ?read? the? notes ?? ? ? Use? the? up and? down? arrows? to? ?change the? parameters? in? the? center? ?section.? ?Or? use? the? mouse.? Use? mouse? for the? 2 x end? blocks.? I? have? 2 x? coil 3.78s? up? right? now.?? |
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Re: Coil 3.72 software
Sand,? salt,? rock salt? have? been? used? by a buddy.? ? ?Then? ?u? have? to? get? it? all? out !? ? ?Buddy? tried? suction? at? one? end.....and? compressed? air? at? the? opposite end.? ? Sorta works.
Table? salt? is? easier? to? get out....? toss? the? completed? coil? into? SS? kitchen? sink? full? with? hot? water.? ? Salt? just? dissolves.? I? have? NOT? needed? to? use? salt? on 1/2"? tubing...? with? an ID? of? 2.5? to? 3.0? inches.....? ditto? with? 1/4"? tubing with a 1.5"? ID.? I? did note? that when? 3/8"? tubing? is? wound on a 1.5"? ID, (NO? salt)? that? the? tubing? ends up? flat.... on? top? +? bottom....and? curved on? both? sides.? ? I? like? the? results.? ?That? coil? was 6.5? turns,? aprx? .66 uh,? installed? between? plate? block? assy..and? C1? tune? cap? on? my? hb? 3CX-3000A7.? ?Coil? was? silver? plated..after? the? fact. I? wind? all? the tubing? coils,? with? turns? TIGHT? together.....? wound on? an? appropriate form,? al /steel tubing.? or PVC,? spray? can,? doweling? etc...with? plenty? of? slack / excess/ lead? length? ? Coil? is then? slid? ?off? the? form.? Biggest? flat? bladed? screwdriver I? own,? is? then? used? at? beginning? of? coil,? and? rotated,? to? induce the? correct? space between? turns? 1+2.? ?Blade? moved? along,? then repeat? the? process? over? and? over,? spiraling? around? ?and? around? the? coil,? till? u? get to? the? other? end.? Then? some? minor? tweaks here? and? there.....? then? done.? ?Coil installed...? leads? formed? a bit ( tubing? spring? ?slid? over leads,? so? tubing does? not? flatten.? ? Any? excess? cut off in bandsaw.? ?Ends? flattened..and? then? punched? with? correct? hole? size.? ?Coil? and? leads? are then? silver? plated.? The? entire? mess free stands.?? Check? out? the? YC-156? ?80-10m? amp? pix? I posted on? the? photo? pages.? ?There? u? can? clearly? see the? tubing? coils? and also? strap? coils.? And? also? the tapped? tubing? coil? used for the? tuned? input.? ?All those? coils? +? straps are hb,? and? all? silver plated with? cool-amp? glop.? Entire? process is? cheap....just takes? some? time.? ?End? result? is? professional? looking.? ?IMO,? these? hb? amps? are just? one? big? metal? work? project.?? Jim? VE7RF |
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Re: Coil 3.72 software
开云体育Make sure you read the text files.? You will need to create a shortcut and change some of the parameters before it works correctly. ? Jim – KR9U ? From: [email protected] [mailto:[email protected]] On Behalf Of Alek Petkovic
Sent: Tuesday, January 7, 2020 11:34 PM To: [email protected] Subject: Re: [ham-amplifiers] Coil 3.72 software ? I got 3.79. Question. How do you change any of the values/parameters? When I open the program, it shows a pre calculated example and there seems to be nothing I can do to change frequency, wire size, inductance, etc, etc. Everything just stays the same. The whole thing is a waste of time, in my view. 73, |
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Re: Coil 3.72 software
开云体育I got 3.79. Question. How do you change any of the values/parameters? When I open the program, it shows a pre calculated example and there seems to be nothing I can do to change frequency, wire size, inductance, etc, etc. Everything just stays the same. The whole thing is a waste of time, in my view. 73, Alek. VK6APK On 8/01/2020 1:52 am, Jim VE7RF wrote:
Latest? version? is? now? 3.78 |
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Re: Coil 3.72 software
Clint, VE3CMQ
开云体育Great info in your posting.? I did not realise that this was why there is usually a large diameter coil in most amps.? I knew it was for the higher frequencies, but never knew exactly why.? ? An easy way to wind coils with tubing is to fill the tubing with sand or table salt. ?This will prevent the tubing from crushing. ?Pinch one end of the tubing, fill it with whatever material you are using to fill the tube and leave an air gap in the end you filled from.? Pinch it closed and wind your coil. ? It’s a simple trick but works well.? It’s one of the methods that is used for musical instruments. ? 73, Clint, VE3CMQ ? From: [email protected] [mailto:[email protected]] On Behalf Of Jim VE7RF
Sent: January 7, 2020 11:52 AM To: [email protected] Subject: Re: [ham-amplifiers] Coil 3.72 software ? Latest? version? is? now? 3.78 |
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Re: Coil 3.72 software
Latest? version? is? now? 3.78
Note? when u? ?go? from? 7? mhz? to? say? 28 mhz...? (for? a? given? inductance)? ?the? XL? will? increase? by? a? factor? of? 4,? since? XL? is? proportional to? F.? ?( XL =? 2pi? x? F? x? ?L)? However? the? RF? resistance? only? increases? to? the? square? root? of? the? freq? ratio.? ?IE:? ?28/7 =? 4? ? ? ?sq? root? of? 4? =? 2? ? ?(skin? effect). XL? has? quadrupled.... but? RF? resistance? has? only doubled.? Since? Q? =? ?XL /? RF? resistance.......? when? u? increase freq to 28 mhz.......? Q? has? now? doubled.? ?Now? with? the? Q? doubled,? joe? ham thinks? he is? doing? really? good with? his? coil? on? 28 mhz. Fact is,? it's? now? worse,? a? dog's? breakfast on 28? mhz.? ?Heat? being? dissipated? in? the? coil is? now? double !? ? Power is of? course I squared .. x R.? ?Double? the? R...and? u? now? just? doubled? the? heat.? Wait, it? gets? worse.? ?On 24-30 mhz,? typ uh? coil? values? for a PI /? PI-L? are? small.? ? U? end? ?up? dissipating? ?more? heat vs? 7? mhz.....? and? into? ?far fewer? turns!? The? only? fix? is? to? reduce the? RF? resistance of? the coil? on? 24-30? mhz....? by? increasing? the? diameter of? the? tubing used.? Larger? diam tubing? coils (esp? with? smallish ID's)? ?are not? easy? to? wind.? 3/8"? OD? tubing? wound? on a 1.5"? form? is? doable.? ?1/2"? OD? tubing wound on a 1.5"? form? is a real? bitch.? (I? use? the? 1.5"? ID? ?tubing coils? for? the? small? coil between plate? block? cap? assy? and C1? tune? cap. Plan? B? is? to? use? copper? strap,? and? wind? a? strap? coil.? ?Flat? strap? coils? are? very? easy? to? wind.? You? can? also? wind,? with very? little? spacing? between? turns.? ?With? tubing? coils,? optimum spacing? between? turns? is slightly greater (8-10%)? than? the OD? of? the? tubing? used.? Tubing coils? only? conduct? current? on? the? outside? of? the? coil.? ?Strap? coils (and? also? interconnecting? straps)? conduct on? both? sides.? ?3/4"? wide? strap? has? the same? outer? circumference as? 1/2"? tubing.? ?1.5" wide? strap? as? the? same? circumference as? 1" OD tubing.? Current? through? the? tank? coil? on a simple? PI? net is? aprx? plate? current? x? Q. (I? have? measured? this,? and? the? simple? formula? was? surprisingly accurate,? within? 1/10? amp,? on? a? RF? ammeter).? ? Double? the? plate current,? and? RF? current? doubles...(for? the? same? loaded? Q).? ? Double? the? RF? current, and? heat? dissipated? in? the? tank? coil? quadruples.? ? ?High plate? current? and? high? loaded? Q? is a bad? combo.? Hence? the use? of a? small coil? between plate? block? cap? and? C1? tune? cap....? to? reduce? the plate? load? Z? to a manageable number.? (that? small? coil? has? lotsa? current? through? it,? treat? it? the? same as? the? main? tank? coil.) Avoid? ferrous? steel....and? also? SS? in? tank? circuits.? Use? brass /? bronze /? phosphor? bronze? for? fasteners...? (all 3? can? easily be silver? plated? with? cool-amp? glop).? Ditto? with? RF? connections? at at? feed points,? tuners,? remote? switch? boxes? etc.? Using? coil? 3.78,? ?you? can? see? at? a? glance? what? the? exact? RF? resistance? of a given? coil? will? be.? Knowing? the? RF? current,? the? heat? dissipated in? the? coil is? easily? calculated.? Knowing the OD? of? the? tubing? being? used...and? the? coil? diameter..and? length,? and? number? of? turns,? it's a few? simple? calcs? to? determine the? exact surface? area of? the? entire? coil.? ? Take? the? watts? dissipated....? and? divide? by? the? surface? area.... and? the? result? will? be...? "watts? per? square? inch" .? ?My? way to? deal? with? heat? is to? try? and? ?generate? less? heat? as? possible.? Cu? tubing is? cheap? at? home? depot.? ?I? silver? plate? all? my? coils? with? cool-amp? glop....mainly for? aesthetic? reasons.? ? Copper? strap? comes? from? local? metal? store.? I typ? get? em? to? shear 3'? lengths? ?of? 1/2", 3/4",? and? 1".....and? sometimes? wider.? ?Typ? .035"? thickness? used,? easy? to? work? with.? For? rigid? strap? coils, .049"? thickness? is? used.?? Later....? 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 0.456Ω (766 kW). They dump the waste heat into Jim Creek. We were told that the creek temperature rises 1° when they have the transmitter cranked up to +3 dBM (2 MW). Oy!
Bryan WA7PRC |
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Re: Plate blocking caps YC156
开云体育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:
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Re: Plate blocking caps YC156
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Show quoted text
You ought to look in to a BIG Continental or other
US amp if you want to see quality.
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BIG starts at 100KW
?
Carl
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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 |
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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 |
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Re: Plate blocking caps YC156
开云体育Yeah. The anti corona balls on the screws on the switch wafer are
something else too. On 31/12/2019 10:20 am,
tardivat@... wrote:
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. |
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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. |
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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 |
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Re: Dielectric grease for roller inductors ?
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Show quoted text
OEP still makes variable caps and all the TX
variety use that grease/goo/goop
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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 |
