Hello,

This email message is a notification to let you know that
a file has been uploaded to the Files area of the ham_amplifiers
group.

File : /mkvmods1_0.pdf
Uploaded by : pentalab <jim.thomson@...>
Description : Yaesu MK-V ESSB mod document

You can access this file at the URL:


To learn more about file sharing for your group, please visit:


Regards,

pentalab <jim.thomson@...>

Check the old RCA transmitting tube handbook showing how to apply RF negative feedback to quad 811s

ham_amplifiers@... wrote:

--- In ham_amplifiers@..., FRANCIS CARCIA <carcia@...>
wrote:

Check the old RCA transmitting tube handbook showing how to apply RF

negative feedback to quad 811s

### The file I uploaded has nothing to do with 811's.

### W5CUL and myself wrote it last spring.[6 x months to write and
research it, and test everything] Although not directly related to
Amps.... not too many have seen it. And it was thought it may well
be interesting reading to some yaesu MK-V owner's. At least it's
squeaky clean after I got through with it.

### Hopefully my next PDF file depicting all the 3x6 schematics will
be as professional looking as the MK-V document. Stay tuned... it's a
time consuming, tedious process.

Later... Jim VE7RF

On Jan 17, 2007, at 2:11 PM, FRANCIS CARCIA wrote:

Check the old RCA transmitting tube handbook showing how to apply RF negative feedback to quad 811s

^^ The trouble with the RCA circuit is that while the feedback is negative at HF, due to phase shift in the associated wiring as frequency increases, the feedback becomes slightly positive c. 95MHz and oscillation can result. Gonset and Heath tried the RCA "neutralization" circuit and dropped it like a hot potato.
...
R. L. Measures, AG6K, 805.386.3734
r@..., rlm@..., www.somis.org

I wonder if you just wrapped a few turns of wire around the end of the input choke with a pick up probe near the tube this phase shift could be controlled. Also may need a LRC network....just dreaming sounds like something to simulate.

R L Measures wrote:

开云体育

Hi,
Pentalab I don't see how this is AMPS related.
BUT I will let it stay as long as there is ROOM in the fileing cabinet.
We are at 37 percent usage and this is a very nice file.

How about some stuff about the FT-2000 PRIVATELY if
you have any.

Thanks..... carry on...

Bob KR4DA retired (So Bell divestiture) ATT computers systems and DATA services customer
services engineer. (That's what they called us... I never thought it should be
engineer in the title)

ham_amplifiers@... wrote:

Hello,

This email message is a notification to let you know that
a file has been uploaded to the Files area of the ham_amplifiers
group.

File : /mkvmods1_0.pdf
Uploaded by : pentalab <jim.thomson@telus.com>
Description : Yaesu MK-V ESSB mod document

You can access this file at the URL:


To learn more about file sharing for your group, please visit:


Regards,

pentalab <jim.thomson@telus.com>

-- 
de KR4DA Bob Middleburg, FL
HK0/KR4DA J79DA FG/KR4DA

It's more for people to look and see what's coming for the YC-243 tube he is putting together.


Supposed to be a nice manual coming down the pike for that tube from him... This was a preview of "what's to come"....


Yeah, very nice manual.


--Toll_Free

--- In ham_amplifiers@..., 1800 Toll Free
<TollFree1800@...> wrote:

It's more for people to look and see what's coming for the YC-243

tube he

is putting together.


Supposed to be a nice manual coming down the pike for that tube

from him... This was a preview of "what's to come"....

Yeah, very nice manual.

#### Bob was refering to the 2nd file I posted. [almost 3 meg] 2nd
file is the 84 page mod document for the Yaesu FT-1000 MK-V that
Mike W5CUL and myself wrote last spring. In PDF format. Bob...
if the file ever becomes too full.... I'll blow it out. Fellows can
take the MK-V mod document and put in on their desk top if they
want to.. and also feel free to send to your buddy's. We corrected
all the yaesu error's and ommison's in both the op and srvc manual.

### I'm working on re-drawing all the 3x6 and YC-243 schematics in
my spare time.. then my draftsman buddy in VE5 land is going to use
his cad program to put em all into one PDF file.... which will get
posted. That will take some time.. as it's a tedious project.
The end result is something that's drawn out right.. easy to read,
detailed notes, options, parts list url's, etc. Say tuned.

### PDF #1 I posted is the peliminary spec sheet for the Eimac YC-
243 that Reid Brandon from Eimac, sent to me. It does have some
minor errors in it.. which have to be fixed.

Later... Jim VE7RF

--Toll_Free

On Thu, 18 Jan 2007 08:10:09 -0800, KR4DA <kr4da@...> wrote:

Hi,
Pentalab I don't see how this is AMPS related.
BUT I will let it stay as long as there is ROOM in the fileing

cabinet.

We are at 37 percent usage and this is a very nice file.

How about some stuff about the FT-2000 PRIVATELY if
you have any.

Thanks..... carry on...

Bob KR4DA retired (So Bell divestiture) ATT computers systems

and DATA

services customer
services engineer. (That's what they called us... I never

thought it

should be
engineer in the title)

ham_amplifiers@... wrote:

On Jan 18, 2007, at 6:11 AM, FRANCIS CARCIA wrote:

I wonder if you just wrapped a few turns of wire around the end of the input choke with a pick up probe near the tube this phase shift could be controlled.

^^ That's pretty what RCA "neutralization" consists of.

Also may need a LRC network....just dreaming sounds like something to simulate.

^^ In actual practice, it's something to regenerate.

R L Measures <r@...> wrote:


On Jan 17, 2007, at 2:11 PM, FRANCIS CARCIA wrote:

Check the old RCA transmitting tube handbook showing how to apply
RF negative feedback to quad 811s

^^ The trouble with the RCA circuit is that while the feedback is
negative at HF, due to phase shift in the associated wiring as
frequency increases, the feedback becomes slightly positive c. 95MHz
and oscillation can result. Gonset and Heath tried the RCA
"neutralization" circuit and dropped it like a hot potato.
...
R. L. Measures, AG6K, 805.386.3734
r@..., rlm@..., www.somis.org

R. L. Measures, AG6K, 805.386.3734
r@..., rlm@..., www.somis.org