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8640B External Reference
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Derward
John, I agree with you. I don't say much on the list, I just enjoy reading.
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I see too many people that get ruffled at almost nothing. I am a 76 year old EE and still run my on design and build co. This is a great hobby and I guess at my age I have learned to let most of the comments slide. If they bother you now in about an hour you will forget it. Believe me in 76 years I have found this by far the best. Derward Myrick KD5WWI ----- Original Message -----
From: John Miles To: hp_agilent_equipment@... Sent: Wednesday, November 21, 2007 4:16 PM Subject: RE: [hp_agilent_equipment] 8640B External Reference Well, to be fair to Arthur, we can quibble with the presentation, but he's right. (I've always assumed he's using a handicap-accessible input device of some kind.) You asked how to run an 8640 from a 10-MHz house clock. He told you how you could do it. And yes, in a Utopian world one would be able to answer this question at the General-class level. No need to attack someone who's just trying to help, is there? That said, I don't bother to run my own 8640 from an external clock at all, since its internal standard is already a good match for the precision of its counter display and locking mechanism. -- john, KE5FX > > I see your reputation for off-handed comments is well deserved. > Too bad you have no clue what you are talking about and I don't > wish to explain it to you. > > 73, Dick, W1KSZ/7 > > -----Original Message----- > >From: arthurok <arthurok@...> > >Sent: Nov 20, 2007 7:01 PM > >To: hp_agilent_equipment@... > >Subject: Re: [hp_agilent_equipment] 8640B External Reference > > > >a flip flop and simple low pass if needed is too > much for an extra class ham to build up?? > |
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Richard W. Solomon
After moving to Arizona I know have at least one of my GPS Stabilized
Oscillators up and running. I intend to use the 10 MHz output as the External Reference for a couple of EIP Counters and I had hoped my 8640B. But, HP in their infinite wisdom, has deemed that a 5 MHz reference is needed. Is there any way to change that from 5 MHz to 10 MHz ? Maybe I should just stick 10 MHz in and see what happens ?? Any thoughts on this ? Thanks, Dick, W1KSZ/7 |
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lothar baier
5MHz was quite common back then, it had to do with the fact that 5MHz XO had a better phasenoise, you will also find 5MHz on many older rubidium and cesium beam standarts.
You have basically two options, the first one is to just use a 2/1 frequency divider, you can find those at any semiconductor company fairly cheap, the other solution which is a bit more intricat is to use a DDS chip to generate your 5MHz out of a 10MHz XO "Richard W. Solomon" <w1ksz@...> wrote: After moving to Arizona I know have at least one of my GPS Stabilized Oscillators up and running. I intend to use the 10 MHz output as the External Reference for a couple of EIP Counters and I had hoped my 8640B. But, HP in their infinite wisdom, has deemed that a 5 MHz reference is needed. Is there any way to change that from 5 MHz to 10 MHz ? Maybe I should just stick 10 MHz in and see what happens ?? Any thoughts on this ? Thanks, Dick, W1KSZ/7 --------------------------------- Never miss a thing. Make Yahoo your homepage. |
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Dick,
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I've got a new Spectracom 8140T frequency distribution "Tap" module that takes 10 MHz in, buffers it, divides it by 2, then filters the output back to a sine wave. 12 VDC "phantom power" also is applied to the 10 MHz input port. If you don't find a better solution, figure 40 bucks plus shipping. No hurry, I have several and they won't disappear anytime soon. Regards, Tom ----- Original Message -----
From: "Richard W. Solomon" <w1ksz@...> To: <hp_agilent_equipment@...> Sent: Tuesday, November 20, 2007 5:16 PM Subject: [hp_agilent_equipment] 8640B External Reference After moving to Arizona I know have at least one of my GPS Stabilized |
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J Forster
Easy. Take the 5 MHz, split it and mix it with itself. You may want a
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buffer amp to follow the mixer output. Mini-Circuits Labs has the parts you need. Best, John Richard W. Solomon wrote: After moving to Arizona I know have at least one of my GPS Stabilized |
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If you use 10 MHz as a clock for a DDS, then, you are just as well off using
a flip-flop. Your output will be just a 5 MHz square wave either way. Now if you were to multiply the 10 MHz up first, like even just doubling it to 20 MHz, then you will have easily exceeded Nyquist and you also have room to put in a nice filter for 5 MHz. Still, the best recommendation was the first one. Just divide by two and filter. You may not even need to filter as most counters use a square wave anyway. 73 - Mike Mike B. Feher, N4FS 89 Arnold Blvd. Howell, NJ, 07731 732-886-5960 _____ From: hp_agilent_equipment@... [mailto:hp_agilent_equipment@...] On Behalf Of lothar baier Sent: Tuesday, November 20, 2007 5:37 PM To: hp_agilent_equipment@... Subject: Re: [hp_agilent_equipment] 8640B External Reference 5MHz was quite common back then, it had to do with the fact that 5MHz XO had a better phasenoise, you will also find 5MHz on many older rubidium and cesium beam standarts. You have basically two options, the first one is to just use a 2/1 frequency divider, you can find those at any semiconductor company fairly cheap, the other solution which is a bit more intricat is to use a DDS chip to generate your 5MHz out of a 10MHz XO "Richard W. Solomon" <w1ksz@earthlink. <mailto:w1ksz%40earthlink.net> net> wrote: After moving to Arizona I know have at least one of my GPS Stabilized Oscillators up and running. I intend to use the 10 MHz output as the External Reference for a couple of EIP Counters and I had hoped my 8640B. But, HP in their infinite wisdom, has deemed that a 5 MHz reference is needed. Is there any way to change that from 5 MHz to 10 MHz ? Maybe I should just stick 10 MHz in and see what happens ?? Any thoughts on this ? Thanks, Dick, W1KSZ/7 --------------------------------- Never miss a thing. Make Yahoo your homepage. |
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lothar baier
sorry i wasnt to clear on that, the DDS i was refering to actually has a clock multiplier build in that allow a max of 30MHz i think.
Mike Feher <n4fs@...> wrote: If you use 10 MHz as a clock for a DDS, then, you are just as well off using a flip-flop. Your output will be just a 5 MHz square wave either way. Now if you were to multiply the 10 MHz up first, like even just doubling it to 20 MHz, then you will have easily exceeded Nyquist and you also have room to put in a nice filter for 5 MHz. Still, the best recommendation was the first one. Just divide by two and filter. You may not even need to filter as most counters use a square wave anyway. 73 - Mike Mike B. Feher, N4FS 89 Arnold Blvd. Howell, NJ, 07731 732-886-5960 _____ From: hp_agilent_equipment@... [mailto:hp_agilent_equipment@...] On Behalf Of lothar baier Sent: Tuesday, November 20, 2007 5:37 PM To: hp_agilent_equipment@... Subject: Re: [hp_agilent_equipment] 8640B External Reference 5MHz was quite common back then, it had to do with the fact that 5MHz XO had a better phasenoise, you will also find 5MHz on many older rubidium and cesium beam standarts. You have basically two options, the first one is to just use a 2/1 frequency divider, you can find those at any semiconductor company fairly cheap, the other solution which is a bit more intricat is to use a DDS chip to generate your 5MHz out of a 10MHz XO "Richard W. Solomon" <w1ksz@earthlink. <mailto:w1ksz%40earthlink.net> net> wrote: After moving to Arizona I know have at least one of my GPS Stabilized Oscillators up and running. I intend to use the 10 MHz output as the External Reference for a couple of EIP Counters and I had hoped my 8640B. But, HP in their infinite wisdom, has deemed that a 5 MHz reference is needed. Is there any way to change that from 5 MHz to 10 MHz ? Maybe I should just stick 10 MHz in and see what happens ?? Any thoughts on this ? Thanks, Dick, W1KSZ/7 --------------------------------- Never miss a thing. Make Yahoo your homepage. --------------------------------- Be a better pen pal. Text or chat with friends inside Yahoo! Mail. See how. |
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as he says a low pass filter will produce a quasi sine wave "gaussian responce"
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----- Original Message -----
From: lothar baier To: hp_agilent_equipment@... Sent: Tuesday, November 20, 2007 5:58 PM Subject: RE: [hp_agilent_equipment] 8640B External Reference sorry i wasnt to clear on that, the DDS i was refering to actually has a clock multiplier build in that allow a max of 30MHz i think. Mike Feher <n4fs@...> wrote: If you use 10 MHz as a clock for a DDS, then, you are just as well off using a flip-flop. Your output will be just a 5 MHz square wave either way. Now if you were to multiply the 10 MHz up first, like even just doubling it to 20 MHz, then you will have easily exceeded Nyquist and you also have room to put in a nice filter for 5 MHz. Still, the best recommendation was the first one. Just divide by two and filter. You may not even need to filter as most counters use a square wave anyway. 73 - Mike Mike B. Feher, N4FS 89 Arnold Blvd. Howell, NJ, 07731 732-886-5960 _____ From: hp_agilent_equipment@... [mailto:hp_agilent_equipment@...] On Behalf Of lothar baier Sent: Tuesday, November 20, 2007 5:37 PM To: hp_agilent_equipment@... Subject: Re: [hp_agilent_equipment] 8640B External Reference 5MHz was quite common back then, it had to do with the fact that 5MHz XO had a better phasenoise, you will also find 5MHz on many older rubidium and cesium beam standarts. You have basically two options, the first one is to just use a 2/1 frequency divider, you can find those at any semiconductor company fairly cheap, the other solution which is a bit more intricat is to use a DDS chip to generate your 5MHz out of a 10MHz XO "Richard W. Solomon" <w1ksz@earthlink. <mailto:w1ksz%40earthlink.net> net> wrote: After moving to Arizona I know have at least one of my GPS Stabilized Oscillators up and running. I intend to use the 10 MHz output as the External Reference for a couple of EIP Counters and I had hoped my 8640B. But, HP in their infinite wisdom, has deemed that a 5 MHz reference is needed. Is there any way to change that from 5 MHz to 10 MHz ? Maybe I should just stick 10 MHz in and see what happens ?? Any thoughts on this ? Thanks, Dick, W1KSZ/7 --------------------------------- Never miss a thing. Make Yahoo your homepage. --------------------------------- Be a better pen pal. Text or chat with friends inside Yahoo! Mail. See how. |
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lothar baier
One thing need to be made clear however, the external timebase will not affect the frequency stability in normal operating mode since it is only used for the frequency counter, if you push the phaselock button then it will lead to an increased stability of the signal.
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Another possibility is to get a 5078A distribution amplifier which would be usefull since he wants to drive some other counters and stuff as well, as far as i know HP made cards to go in those that allowed for a 5MHz or 1MHz output, anyway a 2/1 divider is easy enough to build, you can use TTL or just go to hittite and buy a part for about $2, lowpass filters are wasy to build or you can get a little monolithic one from coilcraft or mini circuits as he says a low pass filter will produce a quasi sine wave "gaussian responce" ----- Original Message -----
From: lothar baier To: hp_agilent_equipment@... Sent: Tuesday, November 20, 2007 5:58 PM Subject: RE: [hp_agilent_equipment] 8640B External Reference sorry i wasnt to clear on that, the DDS i was refering to actually has a clock multiplier build in that allow a max of 30MHz i think. Mike Feher <n4fs@...> wrote: If you use 10 MHz as a clock for a DDS, then, you are just as well off using a flip-flop. Your output will be just a 5 MHz square wave either way. Now if you were to multiply the 10 MHz up first, like even just doubling it to 20 MHz, then you will have easily exceeded Nyquist and you also have room to put in a nice filter for 5 MHz. Still, the best recommendation was the first one. Just divide by two and filter. You may not even need to filter as most counters use a square wave anyway. 73 - Mike Mike B. Feher, N4FS 89 Arnold Blvd. Howell, NJ, 07731 732-886-5960 _____ From: hp_agilent_equipment@... [mailto:hp_agilent_equipment@...] On Behalf Of lothar baier Sent: Tuesday, November 20, 2007 5:37 PM To: hp_agilent_equipment@... Subject: Re: [hp_agilent_equipment] 8640B External Reference 5MHz was quite common back then, it had to do with the fact that 5MHz XO had a better phasenoise, you will also find 5MHz on many older rubidium and cesium beam standarts. You have basically two options, the first one is to just use a 2/1 frequency divider, you can find those at any semiconductor company fairly cheap, the other solution which is a bit more intricat is to use a DDS chip to generate your 5MHz out of a 10MHz XO "Richard W. Solomon" <w1ksz@earthlink. <mailto:w1ksz%40earthlink.net> net> wrote: After moving to Arizona I know have at least one of my GPS Stabilized Oscillators up and running. I intend to use the 10 MHz output as the External Reference for a couple of EIP Counters and I had hoped my 8640B. But, HP in their infinite wisdom, has deemed that a 5 MHz reference is needed. Is there any way to change that from 5 MHz to 10 MHz ? Maybe I should just stick 10 MHz in and see what happens ?? Any thoughts on this ? Thanks, Dick, W1KSZ/7 --------------------------------- Never miss a thing. Make Yahoo your homepage. --------------------------------- Be a better pen pal. Text or chat with friends inside Yahoo! Mail. See how. --------------------------------- Get easy, one-click access to your favorites. Make Yahoo! your homepage. |
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Richard W. Solomon
So basically what you are telling me is that it is not worth the effort to try and supply
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an external reference to the 8640B, yes ?? I have two TrueTime XL-AK GPS Receivers that have 5 outputs on the rear, internally selectable for 10, 1, .1, .01 MHz and 1 pps outputs. I guess I'll just use one to supply the counters. Thanks for the replies. 73, Dick, W1KSZ/7 -----Original Message-----
From: lothar baier <microwaveengineer1968@...> |
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a flip flop with a low pass filter should work quite well at generating a nice sine wave
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go to tonne software and download his free filter design software you can either use off the shelf chokes or make them up using toroids and your q meter little piece of perf board and a cmos flipflop should do then check the output with your spectrum analyzer. maybe the man is right and a square wave is all thats needed id have to look at my pdf of an 8640b i have 2 of them and the internal vcxos are good enough for what im doing concidering that they were an upgrade from a 606a / 608d that i used for over 20 yrs one nice thing about the 606a is that i can manualy sweep it very quickly to check frequency responce i have a wavetek 166 50 mhz function generator/ pulse generator that i can do that with too it came from someone who gave up on fixing it i have another 10 mhz wavetek that came as a parts unit and i learned their circuits from it the 166 is well worth having ----- Original Message -----
From: Richard W. Solomon To: hp_agilent_equipment@... Sent: Tuesday, November 20, 2007 4:16 PM Subject: [hp_agilent_equipment] 8640B External Reference After moving to Arizona I know have at least one of my GPS Stabilized Oscillators up and running. I intend to use the 10 MHz output as the External Reference for a couple of EIP Counters and I had hoped my 8640B. But, HP in their infinite wisdom, has deemed that a 5 MHz reference is needed. Is there any way to change that from 5 MHz to 10 MHz ? Maybe I should just stick 10 MHz in and see what happens ?? Any thoughts on this ? Thanks, Dick, W1KSZ/7 |
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a flip flop and simple low pass if needed is too much for an extra class ham to build up??
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----- Original Message -----
From: Richard W. Solomon To: hp_agilent_equipment@... Sent: Tuesday, November 20, 2007 7:56 PM Subject: Re: [hp_agilent_equipment] 8640B External Reference So basically what you are telling me is that it is not worth the effort to try and supply an external reference to the 8640B, yes ?? I have two TrueTime XL-AK GPS Receivers that have 5 outputs on the rear, internally selectable for 10, 1, .1, .01 MHz and 1 pps outputs. I guess I'll just use one to supply the counters. Thanks for the replies. 73, Dick, W1KSZ/7 -----Original Message----- >From: lothar baier <microwaveengineer1968@...> >Sent: Nov 20, 2007 5:08 PM >To: hp_agilent_equipment@... >Subject: Re: [hp_agilent_equipment] 8640B External Reference > >One thing need to be made clear however, the external timebase will not affect the frequency stability in normal operating mode since it is only used for the frequency counter, if you push the phaselock button then it will lead to an increased stability of the signal. > Another possibility is to get a 5078A distribution amplifier which would be usefull since he wants to drive some other counters and stuff as well, as far as i know HP made cards to go in those that allowed for a 5MHz or 1MHz output, anyway a 2/1 divider is easy enough to build, you can use TTL or just go to hittite and buy a part for about $2, lowpass filters are wasy to build or you can get a little monolithic one from coilcraft or mini circuits > > > as he says a low pass filter will produce a quasi sine wave "gaussian responce" >----- Original Message ----- >From: lothar baier >To: hp_agilent_equipment@... >Sent: Tuesday, November 20, 2007 5:58 PM >Subject: RE: [hp_agilent_equipment] 8640B External Reference > >sorry i wasnt to clear on that, the DDS i was refering to actually has a clock multiplier build in that allow a max of 30MHz i think. > >Mike Feher <n4fs@...> wrote: If you use 10 MHz as a clock for a DDS, then, you are just as well off using >a flip-flop. Your output will be just a 5 MHz square wave either way. Now if >you were to multiply the 10 MHz up first, like even just doubling it to 20 >MHz, then you will have easily exceeded Nyquist and you also have room to >put in a nice filter for 5 MHz. Still, the best recommendation was the first >one. Just divide by two and filter. You may not even need to filter as most >counters use a square wave anyway. 73 - Mike > >Mike B. Feher, N4FS > >89 Arnold Blvd. > >Howell, NJ, 07731 > >732-886-5960 > >_____ > >From: hp_agilent_equipment@... >[mailto:hp_agilent_equipment@...] On Behalf Of lothar baier >Sent: Tuesday, November 20, 2007 5:37 PM >To: hp_agilent_equipment@... >Subject: Re: [hp_agilent_equipment] 8640B External Reference > >5MHz was quite common back then, it had to do with the fact that 5MHz XO had >a better phasenoise, you will also find 5MHz on many older rubidium and >cesium beam standarts. >You have basically two options, the first one is to just use a 2/1 frequency >divider, you can find those at any semiconductor company fairly cheap, the >other solution which is a bit more intricat is to use a DDS chip to generate >your 5MHz out of a 10MHz XO > >"Richard W. Solomon" <w1ksz@earthlink. <mailto:w1ksz%40earthlink.net> net> >wrote: >After moving to Arizona I know have at least one of my GPS Stabilized >Oscillators up and running. I intend to use the 10 MHz output as the >External Reference for a couple of EIP Counters and I had hoped my >8640B. But, HP in their infinite wisdom, has deemed that a 5 MHz >reference is needed. Is there any way to change that from 5 MHz to 10 >MHz ? Maybe I should just stick 10 MHz in and see what happens ?? > >Any thoughts on this ? > >Thanks, Dick, W1KSZ/7 > >--------------------------------- >Never miss a thing. Make Yahoo your homepage. > > > > > >--------------------------------- >Be a better pen pal. Text or chat with friends inside Yahoo! Mail. See how. > > > > > > > > > > >--------------------------------- >Get easy, one-click access to your favorites. Make Yahoo! your homepage. > > > > > > >Yahoo! Groups Links > > > |
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i own a copy of his meter software the filter software is free for the limited versions which is all i ever used for my projects. and are very easy to use "i hate doing math" ----- Original Message -----
From: lothar baier To: hp_agilent_equipment@... Sent: Tuesday, November 20, 2007 5:58 PM Subject: RE: [hp_agilent_equipment] 8640B External Reference sorry i wasnt to clear on that, the DDS i was refering to actually has a clock multiplier build in that allow a max of 30MHz i think. Mike Feher <n4fs@...> wrote: If you use 10 MHz as a clock for a DDS, then, you are just as well off using a flip-flop. Your output will be just a 5 MHz square wave either way. Now if you were to multiply the 10 MHz up first, like even just doubling it to 20 MHz, then you will have easily exceeded Nyquist and you also have room to put in a nice filter for 5 MHz. Still, the best recommendation was the first one. Just divide by two and filter. You may not even need to filter as most counters use a square wave anyway. 73 - Mike Mike B. Feher, N4FS 89 Arnold Blvd. Howell, NJ, 07731 732-886-5960 _____ From: hp_agilent_equipment@... [mailto:hp_agilent_equipment@...] On Behalf Of lothar baier Sent: Tuesday, November 20, 2007 5:37 PM To: hp_agilent_equipment@... Subject: Re: [hp_agilent_equipment] 8640B External Reference 5MHz was quite common back then, it had to do with the fact that 5MHz XO had a better phasenoise, you will also find 5MHz on many older rubidium and cesium beam standarts. You have basically two options, the first one is to just use a 2/1 frequency divider, you can find those at any semiconductor company fairly cheap, the other solution which is a bit more intricat is to use a DDS chip to generate your 5MHz out of a 10MHz XO "Richard W. Solomon" <w1ksz@earthlink. <mailto:w1ksz%40earthlink.net> net> wrote: After moving to Arizona I know have at least one of my GPS Stabilized Oscillators up and running. I intend to use the 10 MHz output as the External Reference for a couple of EIP Counters and I had hoped my 8640B. But, HP in their infinite wisdom, has deemed that a 5 MHz reference is needed. Is there any way to change that from 5 MHz to 10 MHz ? Maybe I should just stick 10 MHz in and see what happens ?? Any thoughts on this ? Thanks, Dick, W1KSZ/7 --------------------------------- Never miss a thing. Make Yahoo your homepage. --------------------------------- Be a better pen pal. Text or chat with friends inside Yahoo! Mail. See how. |
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k1ggi
The 8640B external reference can be configured to accept a 1MHz input,
but the jumpers are deeply buried in the time-base module on A8A3. It is not necessary for the reference to be a sinusoid. It is first attenuated and then amplified before being fed into a logic gate, which feeds the counter chain. The internal oscillator always runs and there can be some weak crosstalk that beats the internal with the external reference, which can show up when they are very close in frequency as very close-in spurs. 73, Ed, K1GGI --- In hp_agilent_equipment@..., "Richard W. Solomon" <w1ksz@...> wrote: effort to try and supply an external reference to the 8640B, yes ??rear, internally selectable for 10, 1, .1, .01 MHz and 1 pps outputs. I guess I'll just use oneto supply the counters.
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Richard W. Solomon
I see your reputation for off-handed comments is well deserved.
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Too bad you have no clue what you are talking about and I don't wish to explain it to you. 73, Dick, W1KSZ/7 -----Original Message-----
From: arthurok <arthurok@...> |
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Richard W. Solomon
Thank you, I will look into that.
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73, Dick, W1KSZ/7 -----Original Message-----
From: k1ggi <k1ggi@...> |
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Richard W. Solomon
I found where the jumpers are located, thanks again.
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The answer that I was looking for. 73, Dick, W1KSZ/7 -----Original Message-----
From: "Richard W. Solomon" <w1ksz@...> |
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John Miles
Well, to be fair to Arthur, we can quibble with the presentation, but he's right. (I've always assumed he's using a handicap-accessible input device of some kind.) You asked how to run an 8640 from a 10-MHz house clock. He told you how you could do it. And yes, in a Utopian world one would be able to answer this question at the General-class level. No need to attack someone who's just trying to help, is there?
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That said, I don't bother to run my own 8640 from an external clock at all, since its internal standard is already a good match for the precision of its counter display and locking mechanism. -- john, KE5FX
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www.tonnesoftware.com
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hes got some interesting stuff on his site a fellow ham i own a copy of his meter software but havent used it yet i looked at a pdf of the 8640b that i own 2 of both of my 8640b generators came to me needing repair from a guy who bought 3 of them and then sold me the 2 broken ones. it looks to me from viewing the circuit that the 8640b would work just fine using a square wave input the input amp looks to me like a transistor buffer with a little bit of hysterisis feedback to prevent noise multiple pulses you shoul;d see how i type 1 hand on the mouse and the other 1 fingering the keyboard. the 5 mhz oscillator drives a gate that gates the output of the oscillator and when the gate is disabled the 10 mhz output bnc can be used to jam a signal into the 1 transistor buffer. since the output of the buffer drives a divide by 5 chip i guess the system internally only requires 1 mhz i wonder if playing with the jumpers which arent shown on the schematic i looked at would still allow it to operate on the internal tcxo with just the flip of a switch?? from what i read dick has a very impressive toy collection. far superior to mine that i can barely afford. ----- Original Message -----
From: John Miles To: hp_agilent_equipment@... Sent: Wednesday, November 21, 2007 4:16 PM Subject: RE: [hp_agilent_equipment] 8640B External Reference Well, to be fair to Arthur, we can quibble with the presentation, but he's right. (I've always assumed he's using a handicap-accessible input device of some kind.) You asked how to run an 8640 from a 10-MHz house clock. He told you how you could do it. And yes, in a Utopian world one would be able to answer this question at the General-class level. No need to attack someone who's just trying to help, is there? That said, I don't bother to run my own 8640 from an external clock at all, since its internal standard is already a good match for the precision of its counter display and locking mechanism. -- john, KE5FX > > I see your reputation for off-handed comments is well deserved. > Too bad you have no clue what you are talking about and I don't > wish to explain it to you. > > 73, Dick, W1KSZ/7 > > -----Original Message----- > >From: arthurok <arthurok@...> > >Sent: Nov 20, 2007 7:01 PM > >To: hp_agilent_equipment@... > >Subject: Re: [hp_agilent_equipment] 8640B External Reference > > > >a flip flop and simple low pass if needed is too > much for an extra class ham to build up?? > |
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Richard W. Solomon
First, I wouldn't classify my response as an attack, more like a counter-attack.
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You come and ..."dis"... me, you are going to get it back with both barrels. The best response came from another list member who told me about the jumpers on the A8A3 board. The schematic clearly shows how to change the reference input from 5 MHz to 1 MHz. Just what I needed. As for your crack about "General Class Level", I assume you two are related ?? End of discussion and thread, 73, Dick, W1KSZ/7 -----Original Message-----
From: John Miles <jmiles@...> |
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