New Transmitter

[flintstone mop]

Was looking at replacement rectifiers. Of course, no way am I going to go with Mercury Vapor. See this link:

Pair of 833s modulated by a pair, 4000 watts peak @ 2500V B+ equates to 1.6A peak current.

Rule of 4x your working voltage for PIV = 10 KV. Get conservative and run with the 20 KV rated unit at 1A...

Since 1A is below the constant current rating of 1.6A, parallel two for each leg of the HV.

Am I on the right track here? The rectumfryers go for about 5-7 bux each. Need 4, so perhaps 30 dollars spent to replace the 8008s.

Philip

Feelip
the transmitter did fine for many many years with the original design. Clean her up and see what happens after re-assembly; then look into design changes.

Fred

[Steve - K4HX]

Remote control should be pretty easy. Many BC TX have a remote input for keying. Remote audio can be supplied via the standard line level input (as is done in every BC installation). You can have your VFO/exciter at your operating position, so smaller frequency changes can be done right there. When tuning is required, you need a line from the TX location to your exciter. This is just a longer PTT line. In your situation, this should be easy.

Once the TX is tuned up, there is no need to monitor the meters. The TX has overload protection. So if something goes wrong, it will shut down.

I had a very similar set up to yours in the past. My station/operating room was on the second floor of my house. The BC TX was in the basement. I used a FT-101 as the exciter. I used the amp keying output on the 101 to remotely key the BC TX. It worked FB.

[ka4koe]

Its gonna be a job, that's for sure.

Task List (Subject to change).

1. Clean unit.
2. Replace any defective components and wiring.
3. Run dedicated grounding conductor to a ground rod. Probably around #4 directly through conduit sleeve in adjacent exterior wall. Conductor run less than 10' long.
4. Provide dedicated 240V, 1 phase power to unit. Feed it with 50A ampacity No. 8 AWG from a new 30/2 breaker in house electrical panel (probably about 30' run - need to do a voltage drop calc).
5. Power up on original freek.
6. Mod to 160/80m.
7. Mod for PTT.
8. Run control lines and shielded balanced audio lines from operating position directly above.
9. Install audio rack in shack.......clipper, equalizer, compressor, mic preamp (not necessarily in that order).
10. Change antenna system if needed.

I may consider using the Valiant to drive the TX from above; eg. exciter and audio. Timtron recommended this.

I'll be lucky to have it on by the fall.

[KA2DZT]

Connect your new ground rod to the service ground #6 or larger.

No need to do a voltage drop calc, probably today's line voltage is higher than what the xmtr was designed for.

Good luck with it.

Fred

[ka4koe]

Yep...another item. Check service ground. The original builder did a hotel alpha job on a lot of things. Need to borrow a meggar from my power company friend.

[W7TFO]

I don't see what a megger would do in terms of checking a ground system.. ..you need a low-resistance Ohmmeter.

Meggers test insulation and such with high voltage.

73DG

[ka4koe]

Meggers have been used for decades to test ground rod/grounding systems; one method is the "fall of potential".

http://ecmweb.com/bonding-amp-grounding/ground-testing-techniques

[WBear2GCR]

Looks like there's some difference between the electronic test meter called a "megger" and the thing shown for testing the ground rods??

Btw, what's the book that this is from??

                       _-_-

[ka4koe]

Megger is actually a trade name, Bear, Google is your friend. Search for "megger fall of potential method". I don't remember the exact reference.

http://www.megger.com

In other news….

I have the 5x8 enclosed U Haul trailer affixed to the Tacoma. I plan on venturing out on the Great Transmitter Expedition (GTE) at 0500 EDT (0900 Z) tomorrow.

[W2VW]

Best of luck!

[KC4VWU]

Take some old blankets, quilts, or similar with you; as many as you can get. You'll probably have to lie it down and slide it in on it's side, so make it's transition to it's new home as comfy as you can.

2 el.

[w4bfs]

Its gonna be a job, that's for sure.

Task List (Subject to change).

1. Clean unit.
2. Replace any defective components and wiring.
3. Run dedicated grounding conductor to a ground rod. Probably around #4 directly through conduit sleeve in adjacent exterior wall. Conductor run less than 10' long.
4. Provide dedicated 240V, 1 phase power to unit. Feed it with 50A ampacity No. 8 AWG from a new 30/2 breaker in house electrical panel (probably about 30' run - need to do a voltage drop calc).
5. Power up on original freek.
6. Mod to 160/80m.
7. Mod for PTT.
8. Run control lines and shielded balanced audio lines from operating position directly above.
9. Install audio rack in shack.......clipper, equalizer, compressor, mic preamp (not necessarily in that order).
10. Change antenna system if needed.

I may consider using the Valiant to drive the TX from above; eg. exciter and audio. Timtron recommended this.

I'll be lucky to have it on by the fall.

suggest adding 5a      have local fire dept on standby

[WZ5Q]

snip...
I have the 5x8 enclosed U Haul trailer affixed to the Tacoma. I plan on venturing out on the Great Transmitter Expedition (GTE) at 0500 EDT (0900 Z) tomorrow.

Be sure to take GOBS of pictures on your recovery!
Its always fun to see other peoples adventures.
Good luck!!

[KB2WIG]

FWIW,

A couple of old broom handles cut to a bit wider than the transmitter width. Tilt the load back, toss one or two under, roll forward, and repeat.  I moved cemetery  monuments around with this system. (I also used 2X8 planking on the dirt). You also may need a cooler. Put a few 807 inside, pack with ice and yer gud2go. The ice is used to sooth the aching muscles after manhandling this best around. Gud luck on yer mission.

This is what a Megger looks like.


KLC

[ka4koe]

Home safely. Will remove the behemoth tomorrow from the trailer. It's been a LONG day.

[WA2OLZ]

Glad y'all made in back safely. Time to pop the top on a cold 807 after that ride

[ka4koe]

Bad traffic, weather, wrong turn. 10 hours going home. Here is a link to photos!

https://flic.kr/s/aHskac24Kz

[Opcom]

Nice place! I like the audio driver in the pictures.

[WZ5Q]

Glad you made it back safely Philip, with the transmitter in tow.
Bet you can't wait to play with it!
Keep the pics coming, you can never have to much Transmitter Porn.  

Beautiful scenery, the landscape looked pretty good too.
There's just something too sexy about a PP pair of 845's...oh me, ohhhhh my!  
Love the "Cool Breeze" cooling configuration design.
Looking Good Grant!

[ka4koe]

Got TX safely inside. Installed custom stable outrigger dolly. 2 x 3 x 3/16" steel, 1000 lb rated steel casters (each). Fellow in photo is longtime friend W4REQ. Dolly is secured to bottom of TX.

https://flic.kr/s/aHska7gcKA

[W2VW]

Did u send the xyl on a shopping trip?

[ka4koe]

She was at work.

[W6TOM]

  looks good, you did a close measuring job for the height, just cleared your garage door from the look of it. Good pics, enjoy watching others projects.

  My T-368 only had to be transported a 150 miles and I worked out a deal, a friend sold two BC-610's to the guy who I got the T-368 from. He came up here to my place 40 miles from San Jose and then the 150 mile drive. A lot was on two lane mountain roads, we towed a motorcycle trailer, worked out well.

[ka4koe]

Original home of BC1T, 1590 WAWA, "The Giant Killer".

https://news.google.com/newspapers?nid=1368&dat=19740104&id=VotRAAAAIBAJ&sjid=exEEAAAAIBAJ&pg=5582,929102&hl=en

and full of soul with Dr. Bop…..

http://stepfatherofsoul.blogspot.com/2010/06/soul-on-air-15-dr-bop-1973.html

[ka4koe]

Interior higher rez photos...

https://flic.kr/s/aHskagtK3r