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Re: 8566B Battery warning and broken tabs
The A14 Tadiran batteries normally had a life of 8 yrs. and were there for the user stored setting all other calibration factor were stored in EEROM and not locally changeable (except for the members here with EPROM programmers). These units were before the age of easily stored cal data - that came with the HP 8562A SA.
The Tadiran batteries actually have mfr. date codes on them. Don Bitters |
Re: 8566B Battery warning and broken tabs
On my 'A' model, I just cleaned up the Ni-Cad mess and didn¡¯t bother to replace them.
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The B's must have changed the memory technology to lower the drain considerably. -----Original Message-----
From: [email protected] <[email protected]> On Behalf Of John Miles Sent: Thursday, January 27, 2022 5:37 PM To: [email protected] Subject: Re: [HP-Agilent-Keysight-equipment] 8566B Battery warning and broken tabs 8566A/8568A = 3x NiCd, retains settings for a few days/weeks. Can be replaced with cordless phone battery packs. 8566B/8568B = Tadiran primary lithium (lithium thionyl chloride IIRC), good for 20+ years at least. The settings that are saved are the user calibration results (which most people don't bother with), stored programs (ditto), and preselector-peaking adjustments, which are seldom needed because the hardware trimmers normally do a very good job at establishing the defaults. So it's not urgent that dead batteries be replaced... an exception being that if you have an 'A' model with the NiCds, it's best to replace them to avoid leakage problems if nothing else. -- john, KE5FX -----Original Message----- |
Re: 8566B Battery warning and broken tabs
8566A/8568A = 3x NiCd, retains settings for a few days/weeks. Can be replaced with cordless phone battery packs.
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8566B/8568B = Tadiran primary lithium (lithium thionyl chloride IIRC), good for 20+ years at least. The settings that are saved are the user calibration results (which most people don't bother with), stored programs (ditto), and preselector-peaking adjustments, which are seldom needed because the hardware trimmers normally do a very good job at establishing the defaults. So it's not urgent that dead batteries be replaced... an exception being that if you have an 'A' model with the NiCds, it's best to replace them to avoid leakage problems if nothing else. -- john, KE5FX -----Original Message----- |
Re: Hp 140T luminosity issue
I have found just a few high value carbon resistors in the HV section of the 140/141 displays that have either opened or went much higher in value - the 33M ohm (2 watt?) value sounds very familiar - I cannot recall the symptoms exactly. It was difficult to figure out because the voltage readings didn¡¯t make any sense, until you thought it through. I had never encountered one of the high resistance carbon resistor going open before. This is part of a HV divider feeding the HV control circuitry. The idea of paralleling the high value resistor with another is very good.
Don Bitters |
Re: 8566B Battery warning and broken tabs
I am not so sure about the recharging. As I remember, these are PRIMARY batteries and are NOT rechargeable.
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I have not (recently) looked at the 8566 schematics, but in the 8340, there is no recharging path for the battery. The batteries are redilly available, and affordable. Do NOT replace it with a rechargeable battery. Cheers! Bruce Quoting n8zmTWH@...: Those batteries will run down in a few days if unit is not plugged in to power mains. It is just there to support stored setups. Instrument cal data is not affected. |
Re: 8566B Battery warning and broken tabs
Your battery is probably >30 years old. I have some that are 20 years old and they still work! Those Tadirans are worth the money.
Regarding the ejectors, don't bother replacing them. Attach a cable tie loop through the circuit board tooling hole which is almost always right next to the ejector. If you want to do a really nice job, treat the gold plated circuit board fingers with Deoxit annd the board will be really easy to pull out. I would remove the center pin fro the broken ejector because it's just a useless piece of metal that could fall out. Vladan |
Re: 8566B Battery warning and broken tabs
¿ªÔÆÌåÓýThose batteries will run down in a few days if unit is not plugged in to power mains. It is just there to support stored setups. Instrument cal data is not affected. ? From: [email protected] <[email protected]> On Behalf Of DW
Sent: Thursday, January 27, 2022 2:52 PM To: [email protected] Subject: [HP-Agilent-Keysight-equipment] 8566B Battery warning and broken tabs ? This is happening now each time the instrument is plugged in the Battery indicator flashes on the screen. |
8566B Battery warning and broken tabs
This is happening now each time the instrument is plugged in the Battery indicator flashes on the screen.
I pulled out the A14 controller board on the RF section, the battery appears to be a Tadiran TL5104 3.6V battery, looks like a AA sized battery. I measured the voltage of the battery and found it was 0 volts. I see they are still selling these and plan to buy one with the leads attached. No signs of leakage, I have no idea how old this battery is Any ideas where to get replacement tabs for A14 front panel interface? I had one break and a few others are ready to break as well. |
Re: Component shortages - was Re: Axial caps - was Re: [HP-Agilent-Keysight-equipment] Frequency Counter 5340A
@ Dave McGuire
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Hi Dave, I sent you an email, about the subject. Please check your spam folder (eventually) BR, Gyorgy ALBERT -----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf Of Dave McGuire Sent: Thursday, January 27, 2022 6:30 AM To: [email protected] Subject: Re: Component shortages - was Re: Axial caps - was Re: [HP-Agilent-Keysight-equipment] Frequency Counter 5340A Typically 100-300. -Dave On 1/26/22 11:29 PM, Andy ZL3AG via groups.io wrote:
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Re: Component shortages - was Re: Axial caps - was Re: [HP-Agilent-Keysight-equipment] Frequency Counter 5340A
I'm not one to normally go for making stuff up from thin air, but all
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Chinese and Chinese-satellite electronics manufacturers are crying "woe is me, we can't do our work, prices have to go up" and at this point I'm hesitant to believe that this isn't a self-induced problem. It's just too convenient for them, and their figures are too opaque to scrutiny. For what we know the manufacturers might be running at 200% capacity and you wouldn't know, because how would you know how many chips TSMC or any other fab has actually delivered to the specific car, computer, and other manufacturers, each of those panic-buying up to their teeth? There are fabs being planned in the US, but for all we know, they just want to join in on the racket... Looking at their market behavior, Intel's no better than any of the other guys, and before they get any sort of EUV going, the electronics industry will be dying or dead. They don't have the machines, they don't have the know how to use them, they don't even have the concrete slab or the road leading to it. It's all probably 10 years out at least. There are fabs planned in Germany, but like any German industry initiative it'll all be half-assed and expensive beyond any sort of usability. Just look at how BMW works, how PCB fabs work, or how steel part manufacture works. It's all 10x the price in Germany as it is in China or the US, and they're always lagging a decade or two behind the rest of the world. Anyone else seeing this, or am I just taking crazy pills? Things just seem too damn convenient... On Thu, Jan 27, 2022 at 5:30 AM Dave McGuire <mcguire@...> wrote:
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Re: hp 8406A & Power Meters - CW and Pulsed
I have an 8406A Comb Generator I could let go of; what is your location? I am in California 95404.? Jeremy N6WFO On Thu, Jan 27, 2022 at 5:16 AM Christopher Tucker via <cartheur=[email protected]> wrote: All, --
Jeremy Nichols 6. |
Re: hp 8406A & Power Meters - CW and Pulsed
Subject:Re: hp 8406A & Power Meters - CW and Pulsed
There are many Hp, Boonton, Gigatronics, Rhode and Schwarz, and Anritsu peak and average reading power meters, depending on your budget. It recommended that you download one of the good app notes that Hp wrote and has continued to be revised by Keysight now. Suggested app note 1449 from Keysight, Its long but explains the history and the various old and new meters that they have. With limited freq bandwidth that you need, be sure to get the right sensor with type N input.
Since this group is primarily focused on Hp/Agilent/Keysight, an easy to use old peak meter is the Boonton/Hp 8900C or D. Try to get D. It has a unique diode sensor and also a fairly limited dynamic range so you have to pad it to get the sweet spot. The hp436, 437, 438 are popular average reading meters with digital displays. 437s are known to have reliability issues so verify before buying. John Lyles |
Re: hp 8406A & Power Meters - CW and Pulsed
Just to clarify, when you say "power meters" .. are you talking about low power sensor heads (typically 100mW or so maximum) or higher power devices? On Thu, 27 Jan 2022 at 13:13, Christopher Tucker via <cartheur=[email protected]> wrote: All, |
hp 8406A & Power Meters - CW and Pulsed
All,
I am looking for some pieces and asking advice. Anyone have an 8406A Frequency Comb Generator they would be willing to part with? I am also shopping around for power meters: One for CW and another for pulsed power. Need cables and heads for frequency band between 10 kHz and 300 MHz. I think one or two splitters too. What would be the best ones to consider? I'm a bit of a noob on this topic and welcome any advice. Any offers for working units would be appreciated! Thanks in advance. Christopher Tucker |
Re: Component shortages - was Re: Axial caps - was Re: [HP-Agilent-Keysight-equipment] Frequency Counter 5340A
Typically 100-300.
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-Dave On 1/26/22 11:29 PM, Andy ZL3AG via groups.io wrote:
What sort of quantities of the IC's are you talking about? --
Dave McGuire, AK4HZ New Kensington, PA |
Component shortages - was Re: Axial caps - was Re: [HP-Agilent-Keysight-equipment] Frequency Counter 5340A
What sort of quantities of the IC's are you talking about?
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On 27/01/22 17:19, Dave McGuire wrote:
? Wow, yes that does indeed suck. |