Re: Parts to repair an HP 6434B 40V 25A power supply
If the handle is what I think it is, it is malleable steel.
A hammer would be fine, but use some wood between the hammer
and the handle to avoid scarring it. Or, depending on how
it is bent, a vise and a pipe.
Life would be simpler if folks would learn how to pack.
-Chuck Harris
James Newton wrote:
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Thanks for the advice Chuck,
I'm trying some epoxy on the bezel as we speak.
Not sure what I have that would bend that handle... it's a monster. How do you
think beating it a bit with a hammer would work? It isn't bent much... just enough
to jam the bolt in it and cause it to be misaligned with the case.
Picked up the banana post today, I'll try soldering that on once I have the meter
back in and then fire it up and hope it doesn't smoke.
-- James.
|
Re: Parts to repair an HP 6434B 40V 25A power supply
Thanks for the advice Chuck,
I'm trying some epoxy on the bezel as we speak.
Not sure what I have that would bend that handle... it's a monster. How do you think beating it a bit with a hammer would work? It isn't bent much... just enough to jam the bolt in it and cause it to be misaligned with the case.
Picked up the banana post today, I'll try soldering that on once I have the meter back in and then fire it up and hope it doesn't smoke.
--
James.
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--- In hp_agilent_equipment@..., Chuck Harris <cfharris@...> wrote:
Take the bezel apart, and glue it back together. If you
are careful, it should even look ok. Bakelite glues ok
with cyanoacrylates, and most every other plastic does
ok with a thin solvent glue, like testors.
As to the handle, You can sometimes bend them back if you
go in small steps, and let the aluminum relax before the
next bend. The bolts that remain won't need drilling, as
once the tension is off, they should turn easily.
-Chuck Harris
James Newton wrote:
Just purchased this thing from eBay and the seller shipped it without ANY padding
on the bottom of the box. I know they are pretty well built, but that's just
crazy... He refunded the purchase price, so I got what's left for the shipping.
Right handle sheared off the case, the ends are bent so I doubt I can drill out
the bolts and re-mount it. HP Part # 5020-5512
And the left (voltage) meter was pushed back into the case after the handle
wiggled over to that side and got pushed up against the box. The meter /may/ be
ok, but the little black plastic bezel that holds the meter in is cracked. HP part
# 4040-0296.
And the (-) binder clip is sheared off. No problem repairing that.
I can probably live without the handle. Any ideas where I can get a new bezel or
mount that meter? Very strange mounting system. Hope someone here has seen it and
knows what I'm talking about.
By way of introduction: I've been in firmware most of my life, I ran the MIT
PIClist mailing list for years and still archive it at PICList.com. I make and
sell some open source stepper drivers now and so I'm getting more into
electronics. I have a 1662C 'scope and a 1653B analyzer that I love. Can't beat
the old stuff.
------------------------------------
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|
On Fri, Dec 21, 2012 at 1:22 PM, Dave Daniel <kc0wjn@...> wrote: Wow. I didn't know HP bought Boonton. I always liked Boonton
instruments, probably because I was born in Boonton. When did HP buy them?
Dave This is confusing (at least to me), because there was Boonton Electronics, Boonton Measurements (usually just called Measurements), and Boonton Radio. HP bought Boonton Radio, but not the other two. Most of the familiar Boonton instruments are from Boonton Electronics.
|
On 12/21/2012 5:39 PM, J. Forster wrote:
-John
Hello-- There's also... ...And... ...And even Wikipedia gets into the act... 73-- Brad AA1IP
|
Re: 70902A spectrum analyzer IF module RESOLUTION BANDWIDTH problems
I think the IF filter architecture of the 70902A may be roughly the same as in the 8566. If so, those crystal filters are all 3.0 MHz center frequency, with the bandwidth set by controlling the load impedance, hence Q, by virtue of the RF resistance of PIN diodes. It should be a cascade of similar stages, all with varying PIN currents according to the selected IFBW. So, all of the sections should be active, but the BW is controlled by logical steps supplying PIN currents set by precision series resistors. The higher the PIN currents, the narrower the BW. There should be other PINs to route the IF around the crystal section at the wider bandwidths, and also some to provide gain compensation to match the gain for all the BW settings.
In the 8566, the 21.4 MHz IF is mixed down to 3 MHz, processed through the filters, then converted back up and sent on its way. I don't recall if the LC filters also process at 3 MHz, or at 21.4 MHz - either way is possible.
Those indicator lights may be the key to solving the problem, but not for the reason you suggested. It's possible that those are overload or other status indicators - not necessarily logical on/off. Maybe some of the logic states or levels are wrong, causing some filter BW settings to do the wrong thing. You would have to find the individual BW selection logic lines and see what they're doing. They may be high voltage logic - directly driving the PIN current setting resistors with up to +/- 20 V or so. Just remember, when the crystal section is needed, all the stages should be on, while the logically-controlled PIN currents set the BW.
Since these PIN signal routing and "tuning" lines actually can be considered to be analog control, a loose line out of control can allow for various wrong currents to flow between stages, causing interesting results - that is what I think may have happened. A wrongly tuned or stuck filter stage, or a partially turned on switch that should be on or off, could make quite a mess.
You may want to look at the down/up conversion process too, to make sure it's actually on the right frequency - there should be a crystal oscillator nearby running at 18.4 or 24.4 MHz. The filter crystals should say 3 MHz, or whatever they run at. If they are 21.4 MHz, then no down/up conversion is needed. If you can ID these you'll have a pretty good idea of what's going on.
It sounds like you don't have a schematic or manual, but maybe similar systems like the 8566 would at least provide some info you can use, presuming it's actually similar. I don't recall there being indicators on the filters, but I've never needed to look closely at the IF/display section yet.
The breakpoints around 10 kHz or 3 kHz make sense - the crystal filters are only used at the narrowest bandwidths, while the LC ones do the upper, and may also be in-line when the crystal section is used. I believe the LC filters are fixed BW, set only by the L and C adjustments - not by PIN loading - although there would be associated PIN switches for signal routing.
Ed
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--- In hp_agilent_equipment@..., "roberto.barrios" <rbarrioss@...> wrote:
Hello,
I am trying to fix a 71100A spectrum analyzer and I'm stuck. It passes the "analyzer test" built into the firmware but does not pass calibration of the resolution bandwidth for some of the bandwidth filters (in the 70902A IF module).
The problen is easily seen in the shape of the curve from the calibrator, which for three of the filters does not look like it should. If you take a look at
you will see that:
* 10 Hz: Looks like if it was composed of two filters in series not aligned to the same center frequency. Peak amplitude 8 dB down.
* 30 Hz: Almost right but again not 100% symmetric. Peak amplitude OK.
* 100 Hz: Seems nice to me.
* 300 Hz: Just A bit asymmetric
* 1.00 kHz: Ugly, centered but no simmetry. Peak amplitude OK.
* 3.00 kHz: Ugliest, a complete mess. Peak amplitude 13dB up.
* 30.0 kHz: Looks nice.
* 100 kHz: Strange shape, convex skirts instead of concave (??)
* 300 kHz: Strange shape, convex skirts instead of concave (??)
The first error ( 2023 , Illegal Cal Signal ) appears when the 3.0 kHz test is done. The last one ( 6011 , RBW hardware error ) appears after the last one, which is the 10Hz test.
I have the Component Level Information Package (from ARTEKMANUALS) for the module, and it shows there are (among other), 9 filter stages:
LC1 > LC2 > XTAL1 > XTAL2 > XTAL3 > XTAL4 > XTAL5 > LC3 > LC4
Most of the stages have a bandwidth and center control pot/cap, some also a symmetry control. I tweaked them and could not see any significant difference in the ones that don't look nice so I carefully left them all where they were.
There are also "SHORT" LEDs on each filter stage, I believe to signal which stages are being bypassed. What I do not understand is why the LC1, LC2, LC3 and LC4 LEDs are never ON and the XTAL1, XTAL2, XTAL3, XTAL4 and XTAL5 are either ON
of OFF, all at the same time. From 10K up they are all ON and from 3K and down they are all OFF. I was expecting some kind of weighted switching to get the desired filter bandwidth, so I could find and repair the stage that was failing, but it does not seem to be that easy. Since it is possible to have continuos bandwidth control, some of the stages are probably not as simple as I thought.
Appart from some of the trim caps being stuck, there was no physical damage that I could find.
Does anyone know how the filter stages work? Suggestions to try?
Thank you and Merry xmas to you all.
Roberto EB4EQA
|
-John
===============
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I didn't know there was a Boonton group. I'll check it out.
Regards.
Max. K 4 O DS.
Email: max@...
Transistor site
Vacuum tube site:
Woodworking site
Music site:
To subscribe to the fun with transistors group send an email to.
funwithtransistors-subscribe@...
To subscribe to the fun with tubes group send an email to,
funwithtubes-subscribe@...
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----- Original Message -----
From: "J. Forster" <jfor@...>
To: <hp_agilent_equipment@...>
Sent: Friday, December 21, 2012 2:04 PM
Subject: Re: [hp_agilent_equipment] HP Oldies.
Also ask on the Boonton Group.
-John
==========
I am looking for a couple of HP oldies. The 260A Q meter and the 250A
RX
meter. I can't find any on eBay. These two instruments were carried
over
from Boonton when HP bought them out.
Regards.
Max. K 4 O DS.
Email: max@...
Transistor site
Vacuum tube site:
Woodworking site
Music site:
To subscribe to the fun with transistors group send an email to.
funwithtransistors-subscribe@...
To subscribe to the fun with tubes group send an email to,
funwithtubes-subscribe@...
To subscribe to the fun with wood group send a blank email to
funwithwood-subscribe@...
------------------------------------
Yahoo! Groups Links
|
Re: 70902A spectrum analyzer IF module RESOLUTION BANDWIDTH problems
Hi Roberto,
Check your e-mail.
Vladan
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Show quoted text
--- In hp_agilent_equipment@..., "roberto.barrios" <rbarrioss@...> wrote:
Hello,
I am trying to fix a 71100A spectrum analyzer and I'm stuck. It passes the "analyzer test" built into the firmware but does not pass calibration of the resolution bandwidth for some of the bandwidth filters (in the 70902A IF module).
The problen is easily seen in the shape of the curve from the calibrator, which for three of the filters does not look like it should. If you take a look at
you will see that:
* 10 Hz: Looks like if it was composed of two filters in series not aligned to the same center frequency. Peak amplitude 8 dB down.
* 30 Hz: Almost right but again not 100% symmetric. Peak amplitude OK.
* 100 Hz: Seems nice to me.
* 300 Hz: Just A bit asymmetric
* 1.00 kHz: Ugly, centered but no simmetry. Peak amplitude OK.
* 3.00 kHz: Ugliest, a complete mess. Peak amplitude 13dB up.
* 30.0 kHz: Looks nice.
* 100 kHz: Strange shape, convex skirts instead of concave (??)
* 300 kHz: Strange shape, convex skirts instead of concave (??)
The first error ( 2023 , Illegal Cal Signal ) appears when the 3.0 kHz test is done. The last one ( 6011 , RBW hardware error ) appears after the last one, which is the 10Hz test.
I have the Component Level Information Package (from ARTEKMANUALS) for the module, and it shows there are (among other), 9 filter stages:
LC1 > LC2 > XTAL1 > XTAL2 > XTAL3 > XTAL4 > XTAL5 > LC3 > LC4
Most of the stages have a bandwidth and center control pot/cap, some also a symmetry control. I tweaked them and could not see any significant difference in the ones that don't look nice so I carefully left them all where they were.
There are also "SHORT" LEDs on each filter stage, I believe to signal which stages are being bypassed. What I do not understand is why the LC1, LC2, LC3 and LC4 LEDs are never ON and the XTAL1, XTAL2, XTAL3, XTAL4 and XTAL5 are either ON
of OFF, all at the same time. From 10K up they are all ON and from 3K and down they are all OFF. I was expecting some kind of weighted switching to get the desired filter bandwidth, so I could find and repair the stage that was failing, but it does not seem to be that easy. Since it is possible to have continuos bandwidth control, some of the stages are probably not as simple as I thought.
Appart from some of the trim caps being stuck, there was no physical damage that I could find.
Does anyone know how the filter stages work? Suggestions to try?
Thank you and Merry xmas to you all.
Roberto EB4EQA
|
70902A spectrum analyzer IF module RESOLUTION BANDWIDTH problems
Hello,
I am trying to fix a 71100A spectrum analyzer and I'm stuck. It passes the "analyzer test" built into the firmware but does not pass calibration of the resolution bandwidth for some of the bandwidth filters (in the 70902A IF module).
The problen is easily seen in the shape of the curve from the calibrator, which for three of the filters does not look like it should. If you take a look at
you will see that:
* 10 Hz: Looks like if it was composed of two filters in series not aligned to the same center frequency. Peak amplitude 8 dB down.
* 30 Hz: Almost right but again not 100% symmetric. Peak amplitude OK.
* 100 Hz: Seems nice to me.
* 300 Hz: Just A bit asymmetric
* 1.00 kHz: Ugly, centered but no simmetry. Peak amplitude OK.
* 3.00 kHz: Ugliest, a complete mess. Peak amplitude 13dB up.
* 30.0 kHz: Looks nice.
* 100 kHz: Strange shape, convex skirts instead of concave (??)
* 300 kHz: Strange shape, convex skirts instead of concave (??)
The first error ( 2023 , Illegal Cal Signal ) appears when the 3.0 kHz test is done. The last one ( 6011 , RBW hardware error ) appears after the last one, which is the 10Hz test.
I have the Component Level Information Package (from ARTEKMANUALS) for the module, and it shows there are (among other), 9 filter stages:
LC1 > LC2 > XTAL1 > XTAL2 > XTAL3 > XTAL4 > XTAL5 > LC3 > LC4
Most of the stages have a bandwidth and center control pot/cap, some also a symmetry control. I tweaked them and could not see any significant difference in the ones that don't look nice so I carefully left them all where they were.
There are also "SHORT" LEDs on each filter stage, I believe to signal which stages are being bypassed. What I do not understand is why the LC1, LC2, LC3 and LC4 LEDs are never ON and the XTAL1, XTAL2, XTAL3, XTAL4 and XTAL5 are either ON
of OFF, all at the same time. From 10K up they are all ON and from 3K and down they are all OFF. I was expecting some kind of weighted switching to get the desired filter bandwidth, so I could find and repair the stage that was failing, but it does not seem to be that easy. Since it is possible to have continuos bandwidth control, some of the stages are probably not as simple as I thought.
Appart from some of the trim caps being stuck, there was no physical damage that I could find.
Does anyone know how the filter stages work? Suggestions to try?
Thank you and Merry xmas to you all.
Roberto EB4EQA
|
Re: FS: Percent Modulation meter for HP 608 (?) signal generators
Oops? I looked up the meters in the 608D manual and I find that the two are not identical. The RF level is 50 uA while the modulation is 1 mA. Unfortunately I need the RF level for the 608. In the case of the 606 the PDF of the manual I have is not very clear and I couldn't find the meter listing. I think they are both 200 uA meter movements. I had to shunt the 100 uA meter I kluged in to be able to calibrate it.
Regards.
Max. K 4 O DS.
Email: max@...
Transistor site
Vacuum tube site:
Woodworking site
Music site:
To subscribe to the fun with transistors group send an email to.
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----- Original Message ----- From: "Brad Thompson" <brad.thompson@...> To: <hp_agilent_equipment@...> Sent: Friday, December 21, 2012 2:43 PM Subject: [hp_agilent_equipment] FS: Percent Modulation meter for HP 608 (?) signal generators Hello--
In case anyone needs a replacement, I'm offering FS a NOS
(new-old-stock) "Percent Modulation" meter, HP p/n 1120-0397-1,
1 mA full-scale movement. This meter bears a corporate
calibration sticker that seals the meter's adjustment screw,
but the date-of-calibration code is not obvious.
IIRC, this meter is an exact replacement for the percentage
modulation meters used in HP's 608-C (and possibly other
608-family?) signal generators; if that's incorrect, please
let me know.
I'm asking $10.00 plus USPS postage; I honor PayPal and welcome questions.
Thanks, and 73--
Brad AA1IP
------------------------------------
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|
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----- Original Message ----- From: "Max Robinson" <max@...> To: <hp_agilent_equipment@...> Sent: Friday, December 21, 2012 11:59 AM Subject: [hp_agilent_equipment] HP Oldies. I am looking for a couple of HP oldies. The 260A Q meter and the 250A RX
meter. I can't find any on eBay. These two instruments were carried over
from Boonton when HP bought them out.
Regards.
Max. K 4 O DS.
I've seen both for sale occasionally. Search for Boonton since most were made by them. I have both instruments and a 190A VHF Q-Meter. I am looking for a main capacitor assembly for mine. It was evidently bumped very hard long before I got it. FWIW, I bought the Q meters at a local swap meet (TRW) and the RX meter via the web.
|
1959. the instruments are shown in the HP 1963 catalog.
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In a message dated 12/21/2012 12:22:30 P.M. Pacific Standard Time, kc0wjn@... writes: Wow. I didn't know HP bought Boonton. I always liked Boonton instruments, probably because I was born in Boonton. When did HP buy them? Dave On 12/21/2012 12:59 PM, Max Robinson wrote:
I am looking for a couple of HP oldies. The 260A Q meter and the 250A RX
meter. I can't find any on eBay. These two instruments were carried over
from Boonton when HP bought them out.
Regards.
Max. K 4 O DS.
Email: _max@... (mailto:max@...)
<mailto:max%40maxsmusicplace.com>
Transistor site _
() Vacuum tube site: _ () Woodworking site
_ () Music site: _ ()
To subscribe to the fun with transistors group send an email to.
_funwithtransistors-subscribe@...
(mailto:funwithtransistors-subscribe@...) <mailto:funwithtransistors-subscribe%40yahoogroups.com>
To subscribe to the fun with tubes group send an email to,
_funwithtubes-subscribe@... (mailto:funwithtubes-subscribe@...) <mailto:funwithtubes-subscribe%40yahoogroups.com>
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_funwithwood-subscribe@... (mailto:funwithwood-subscribe@...) <mailto:funwithwood-subscribe%40yahoogroups.com>
[Non-text portions of this message have been removed] [Non-text portions of this message have been removed]
|
I think the oscillator is okay but I will take another look. If it's weak I'd expect no output on some frequencies, which isn't happening.
Bob
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--- On Fri, 12/21/12, Ken Greenough <g0wbm@...> wrote: From: Ken Greenough <g0wbm@...>
Subject: Re: [hp_agilent_equipment] HP-608A Repair
To: hp_agilent_equipment@...
Date: Friday, December 21, 2012, 12:05 PM
? ----- Original Message -----
? From: Bob Albert
? To: hp_agilent_equipment@...
? Sent: Friday, December 21, 2012 6:02 PM
? Subject: Re: [hp_agilent_equipment] HP-608A Repair
? ?
? I am having attenuator problems also, with a Marconi
TF1066/4. The attenuator rack, made of plastic, had broken
because the generator had been removed from the case
carelessly. I repaired it with epoxy and the repair looks
very good. The attenuator moves smoothly and works well.
? However, the calibration is wrong. The output from
the generator is about 10dB less than the attenuator says.
The pickup coil is as far into the tube as it will go; any
farther and it contacts the coil. There is no means I can
see for rotating the pickup coil, so I am puzzled as to why
the output is low.
? I tried increasing the carrier level, assuming that
wasn't calibrated, but even at maximum the output is several
dB below the dial reading.
? Any ideas? This is a true boat anchor, and is way too
big and heavy for what it does. I want to get it working
properly so I can see about selling it. It has many great
features, and covers from 10 to 470 MHz, AM and FM and so
on. And it's a nice looking unit, with two big circular
dials with two pretty meters and light blue control knobs.
? Bob
? Hello Bob,
? Have you checked that the valves [ tubes] are in full
working order?
? If you're getting low output from the oscillator then
there's nothing the
? attenuator can do to compensate.
? 73 Ken g8beq
? Sorry to the group for the previous mail, I caught
send before I was ready.
? Happy Christmas to all.
?
[Non-text portions of this message have been removed]
------------------------------------
Yahoo! Groups Links
? ? hp_agilent_equipment-fullfeatured@...
|
FS: Percent Modulation meter for HP 608 (?) signal generators
Hello--
In case anyone needs a replacement, I'm offering FS a NOS
(new-old-stock) "Percent Modulation" meter, HP p/n 1120-0397-1,
1 mA full-scale movement. This meter bears a corporate
calibration sticker that seals the meter's adjustment screw,
but the date-of-calibration code is not obvious.
IIRC, this meter is an exact replacement for the percentage
modulation meters used in HP's 608-C (and possibly other
608-family?) signal generators; if that's incorrect, please
let me know.
I'm asking $10.00 plus USPS postage; I honor PayPal and welcome questions.
Thanks, and 73--
Brad AA1IP
|
It was some time in the 60s but I have no idea of the exact year.
Regards.
Max. K 4 O DS.
Email: max@...
Transistor site
Vacuum tube site:
Woodworking site
Music site:
To subscribe to the fun with transistors group send an email to.
funwithtransistors-subscribe@...
To subscribe to the fun with tubes group send an email to,
funwithtubes-subscribe@...
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funwithwood-subscribe@...
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----- Original Message ----- From: "Dave Daniel" <kc0wjn@...> To: <hp_agilent_equipment@...> Sent: Friday, December 21, 2012 2:22 PM Subject: Re: [hp_agilent_equipment] HP Oldies. Wow. I didn't know HP bought Boonton. I always liked Boonton
instruments, probably because I was born in Boonton. When did HP buy them?
Dave
On 12/21/2012 12:59 PM, Max Robinson wrote:
I am looking for a couple of HP oldies. The 260A Q meter and the 250A RX
meter. I can't find any on eBay. These two instruments were carried over
from Boonton when HP bought them out.
Regards.
Max. K 4 O DS.
Email: max@... <mailto:max%40maxsmusicplace.com>
Transistor site
Vacuum tube site:
Woodworking site
Music site:
To subscribe to the fun with transistors group send an email to.
funwithtransistors-subscribe@...
<mailto:funwithtransistors-subscribe%40yahoogroups.com>
To subscribe to the fun with tubes group send an email to,
funwithtubes-subscribe@...
<mailto:funwithtubes-subscribe%40yahoogroups.com>
To subscribe to the fun with wood group send a blank email to
funwithwood-subscribe@...
<mailto:funwithwood-subscribe%40yahoogroups.com>
------------------------------------
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|
I didn't know there was a Boonton group. I'll check it out.
Regards.
Max. K 4 O DS.
Email: max@...
Transistor site
Vacuum tube site:
Woodworking site
Music site:
To subscribe to the fun with transistors group send an email to.
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toggle quoted message
Show quoted text
----- Original Message ----- From: "J. Forster" <jfor@...> To: <hp_agilent_equipment@...> Sent: Friday, December 21, 2012 2:04 PM Subject: Re: [hp_agilent_equipment] HP Oldies. Also ask on the Boonton Group.
-John
==========
I am looking for a couple of HP oldies. The 260A Q meter and the 250A RX
meter. I can't find any on eBay. These two instruments were carried over
from Boonton when HP bought them out.
Regards.
Max. K 4 O DS.
Email: max@...
Transistor site
Vacuum tube site:
Woodworking site
Music site:
To subscribe to the fun with transistors group send an email to.
funwithtransistors-subscribe@...
To subscribe to the fun with tubes group send an email to,
funwithtubes-subscribe@...
To subscribe to the fun with wood group send a blank email to
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------------------------------------
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|
Wow. I didn't know HP bought Boonton. I always liked Boonton
instruments, probably because I was born in Boonton. When did HP buy them?
Dave
toggle quoted message
Show quoted text
On 12/21/2012 12:59 PM, Max Robinson wrote:
I am looking for a couple of HP oldies. The 260A Q meter and the 250A RX
meter. I can't find any on eBay. These two instruments were carried over
from Boonton when HP bought them out.
Regards.
Max. K 4 O DS.
Email: max@... <mailto:max%40maxsmusicplace.com>
Transistor site
Vacuum tube site:
Woodworking site
Music site:
To subscribe to the fun with transistors group send an email to.
funwithtransistors-subscribe@...
<mailto:funwithtransistors-subscribe%40yahoogroups.com>
To subscribe to the fun with tubes group send an email to,
funwithtubes-subscribe@...
<mailto:funwithtubes-subscribe%40yahoogroups.com>
To subscribe to the fun with wood group send a blank email to
funwithwood-subscribe@...
<mailto:funwithwood-subscribe%40yahoogroups.com>
|
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----- Original Message -----
From: Bob Albert
To: hp_agilent_equipment@...
Sent: Friday, December 21, 2012 6:02 PM
Subject: Re: [hp_agilent_equipment] HP-608A Repair
I am having attenuator problems also, with a Marconi TF1066/4. The attenuator rack, made of plastic, had broken because the generator had been removed from the case carelessly. I repaired it with epoxy and the repair looks very good. The attenuator moves smoothly and works well.
However, the calibration is wrong. The output from the generator is about 10dB less than the attenuator says. The pickup coil is as far into the tube as it will go; any farther and it contacts the coil. There is no means I can see for rotating the pickup coil, so I am puzzled as to why the output is low.
I tried increasing the carrier level, assuming that wasn't calibrated, but even at maximum the output is several dB below the dial reading.
Any ideas? This is a true boat anchor, and is way too big and heavy for what it does. I want to get it working properly so I can see about selling it. It has many great features, and covers from 10 to 470 MHz, AM and FM and so on. And it's a nice looking unit, with two big circular dials with two pretty meters and light blue control knobs.
Bob
Hello Bob,
Have you checked that the valves [ tubes] are in full working order?
If you're getting low output from the oscillator then there's nothing the
attenuator can do to compensate.
73 Ken g8beq
Sorry to the group for the previous mail, I caught send before I was ready.
Happy Christmas to all.
|
What's this? You replied, simply quoting my message. Did you plan to comment?
Bob
toggle quoted message
Show quoted text
--- On Fri, 12/21/12, Ken Greenough <g0wbm@...> wrote: From: Ken Greenough <g0wbm@...>
Subject: Re: [hp_agilent_equipment] HP-608A Repair
To: hp_agilent_equipment@...
Date: Friday, December 21, 2012, 12:01 PM
? ----- Original Message -----
? From: Bob Albert
? To: hp_agilent_equipment@...
? Sent: Friday, December 21, 2012 6:02 PM
? Subject: Re: [hp_agilent_equipment] HP-608A Repair
? ?
? I am having attenuator problems also, with a Marconi
TF1066/4. The attenuator rack, made of plastic, had broken
because the generator had been removed from the case
carelessly. I repaired it with epoxy and the repair looks
very good. The attenuator moves smoothly and works well.
? However, the calibration is wrong. The output from
the generator is about 10dB less than the attenuator says.
The pickup coil is as far into the tube as it will go; any
farther and it contacts the coil. There is no means I can
see for rotating the pickup coil, so I am puzzled as to why
the output is low.
? I tried increasing the carrier level, assuming that
wasn't calibrated, but even at maximum the output is several
dB below the dial reading.
? Any ideas? This is a true boat anchor, and is way too
big and heavy for what it does. I want to get it working
properly so I can see about selling it. It has many great
features, and covers from 10 to 470 MHz, AM and FM and so
on. And it's a nice looking unit, with two big circular
dials with two pretty meters and light blue control knobs.
? Bob
?
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Also ask on the Boonton Group.
-John
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I am looking for a couple of HP oldies. The 260A Q meter and the 250A RX
meter. I can't find any on eBay. These two instruments were carried over
from Boonton when HP bought them out.
Regards.
Max. K 4 O DS.
Email: max@...
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----- Original Message -----
From: Bob Albert
To: hp_agilent_equipment@...
Sent: Friday, December 21, 2012 6:02 PM
Subject: Re: [hp_agilent_equipment] HP-608A Repair
I am having attenuator problems also, with a Marconi TF1066/4. The attenuator rack, made of plastic, had broken because the generator had been removed from the case carelessly. I repaired it with epoxy and the repair looks very good. The attenuator moves smoothly and works well.
However, the calibration is wrong. The output from the generator is about 10dB less than the attenuator says. The pickup coil is as far into the tube as it will go; any farther and it contacts the coil. There is no means I can see for rotating the pickup coil, so I am puzzled as to why the output is low.
I tried increasing the carrier level, assuming that wasn't calibrated, but even at maximum the output is several dB below the dial reading.
Any ideas? This is a true boat anchor, and is way too big and heavy for what it does. I want to get it working properly so I can see about selling it. It has many great features, and covers from 10 to 470 MHz, AM and FM and so on. And it's a nice looking unit, with two big circular dials with two pretty meters and light blue control knobs.
Bob
|
