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--- In ham_amplifiers@..., Jan Erik Holm <sm2ekm@...>
wrote:

Well right now I dont have any "official test lab" figures,
however W8JI has measured (if you trust him, I do in this
case) -47 dB.

### W8JI, ALSO claimed in the same sentence, -52db for a Drake
T4XC ! I owned 4 of em yrs ago... and I got the same results as
the ARRL lab did... a paltry -30 db pep... or just -26db compared
to one tone... which is typ of sweep tubes. Even to get that,
Drake used 70 ma of zsac @ almost 700 Vdc.... so the idle POWER
on the pair of sweep tubes was = 99% of the rated plate
dissipation !

### What power level did u run the FT-1000D tests at ?? I
currently have 2 x FT-1000D's.... and 2 x FT-1000MP-MK-V's.
haven't measured any of em. Seems to me the arrl lab measured -
36db PEP when then 1000-d was run full bore at 200 w out.
Yaesu claimed -36db, compared to ONE tone [-42 db pep], when run
at 150w out.

### Would be interesting to know what the 1000-D is at say 100
w output ? I'm betting it's very good.

### also... did u drive it into ALC ??? Try setting the power
output at 200 w.... but only driving it to say 190w [no alc]
and then at 150w.... and again at 100 w ..... all the while the
power output control is sitting at 200w.... and no alc ever
showing in any case. Then try it with alc at top of it range.

### Beware,,, my 2 x FT-1000D's new, were totally out of
calibration on every thing...esp alc. Srvc manual sez between no
alc.. and max alc... should be a 9.7 db difference..... mine was
only 5.2 db. {which is better imo... since hams will wail away on
the ALC]

### Also try adjusting the bias pot. I think the normal idle on a
1000-D is just 1 amp. Tweak it up to 1.5 A.... and also 2.0
A... and re-run ur tests.... u will be surprised.

### On the MK-V.... you can adjust EACH transistor
independently.... ditto with the driver transistors.... and you
do all of this TWICE.... once for AB... and again for CLASS A.

### On AB.. idle is 1 A PER final transistor 2A total. On Class
A... it's a whopping 5 A PER transistor... and 10 A total.

### On the MK-V hidden menu 9-XXX... you can also adjust
the "drive" on a band per band basis... most of em are way too
high. On CW... reducing em a bit, will eliminate the key clix.

### To eliminate ALC overshoot on all these rigs... you can
[ssb/cw] apply external -DCV to the ALC jack. You can also
just limit the audio on ssb with external rack mount
compressor's/limiter's/ distortion cancelled audio clippers. That
way, I can achieve an easy 1500w with NO alc ever showing at
all... if u wanted.

R L Measures wrote:

what Ham transceiver will allow testing of IMD below –40db?

### The yaesu MK-V on Class A... depending on BAND... is -60db
for 3rds... and -75db for 5ths. You can hear the diff on a 2nd
RX 3' away. I can also hear the difference from 1200 miles away
[IF the other station is running barefoot, no linear]

Later... Jim VE7RF

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

Jim...

pentalab wrote:

--- In ham_amplifiers@..., Jan Erik Holm <sm2ekm@...> wrote:

Well right now I dont have any "official test lab" figures,
however W8JI has measured (if you trust him, I do in this
case) -47 dB.

### W8JI, ALSO claimed in the same sentence, -52db for a Drake T4XC ! <snip>

There is NO mention of Drake or T4XC on that entire web page that I posted the quote from <>. It just ain't there.

73, Tony W4ZT

--- In ham_amplifiers@..., Tony King - W4ZT <w4zt-
060920@...> wrote:

Jim...

pentalab wrote:

### W8JI, ALSO claimed in the same sentence, -52db for a

Drake

T4XC ! <snip>

There is NO mention of Drake or T4XC on that entire web page that

I

posted the quote from

<>. It

just ain't there.

#### Tony.... W8JI has mentioned his findings on the Collins AND
the drakes several times now on.... 'amps'. It's buried who
knows where. When 1st saw it, he mentioned the drakes in the same
sentence as the Collins gear. When I saw that, I'm wondering to
myself.... if he's got the drakes wrong.... what else does he
have wrong ? No way in hell ur gonna get -58 db pep from any
drake T4XC...couldn't been a typo... since he quotes the same
drake numbers time and again.

later... Jim VE7RF

73, Tony W4ZT

On Oct 31, 2006, at 12:40 PM, pentalab wrote:

--- In ham_amplifiers@..., Jan Erik Holm <sm2ekm@...>
wrote:

Well right now I dont have any "official test lab" figures,
however W8JI has measured (if you trust him, I do in this
case) -47 dB.

### W8JI, ALSO claimed in the same sentence, -52db for a Drake
T4XC !

From TV sweep tubes? Not likely. .

I owned 4 of em yrs ago... and I got the same results as
the ARRL lab did... a paltry -30 db pep...

This is roughly what I've measured on the air.

or just -26db compared
to one tone... which is typ of sweep tubes. Even to get that,
Drake used 70 ma of zsac @ almost 700 Vdc.... so the idle POWER
on the pair of sweep tubes was = 99% of the rated plate
dissipation !

### What power level did u run the FT-1000D tests at ?? I
currently have 2 x FT-1000D's.... and 2 x FT-1000MP-MK-V's.
haven't measured any of em. Seems to me the arrl lab measured -
36db PEP when then 1000-d was run full bore at 200 w out.
Yaesu claimed -36db, compared to ONE tone [-42 db pep], when run
at 150w out.

### Would be interesting to know what the 1000-D is at say 100
w output ? I'm betting it's very good.

Reducing pep out sometimes slightly increases distortion.

###...

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

Yahoo! Groups Links

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

Those tests where at full power, with quite a bit ALC pulled,
also quite a bit of processing.
One can say that both radios was "forced" a bit, did also use
an audio RF clipper with the KWM2.

This is a modulated spectrum, I modulated the radios with the
mic for about 45 secs and this is the total sample.

I tested the FT-1000D also at 100W but difference was very
small, only changed a db or two towards the better.

Yes "on the air" I have tested to run the FT-1000D with no ALC
compared to ALC on top of the "blue" range. Difference 5 kHz away
is always about 5 dB lower spectrum with no ALC so yes I know that
it makes quite a bit difference.

Yes agree on the calibration also Jim, my two 1000Ds also needed
quite a bit of adjustments. I never did try to increase bias on these
radios, I remember I was playing with that when I had a TS-930.
Since I have measuring equipment I will play a little with that when
I get some time.

73 Jim SM2EKM
----------------------

pentalab wrote:

Yeah thats far far too much, he must have had some dirt
on his glasses when he did that measurement.

I have a T-4XC on the shelf, one of these days I will
measure it.

73 Jim SM2EKM
-------------------
pentalab wrote:

On Nov 1, 2006, at 10:13 PM, Jan Erik Holm wrote:

Yeah thats far far too much, he must have had some dirt
on his glasses when he did that measurement.

My guess is that his glass had been emptied before he made this measurement. cheers, Jim

I have a T-4XC on the shelf, one of these days I will
measure it.

73 Jim SM2EKM
-------------------
pentalab wrote:

have wrong ? No way in hell ur gonna get -58 db pep from any
drake T4XC...couldn't been a typo... since he quotes the same
drake numbers time and again.

later... Jim VE7RF

73, Tony W4ZT

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