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Hi Sam, Thanks ! Since I am looking for the difference between the 50 Ohm and 75 Ohm version, maybe a CLIP of the HP8713A will be more helpful. The A5 module probably ( and hopefully ) only will

I will not remove the topic. If it's being dealt with somewhere else that's fine, but I would have to have a very good reason to delete a thread, and that's not one of them. Dave (group owner)

Jeff, First, the type of antenna you need to use is dependent upon your frequency range of interest. And from that if you are looking for accurate field strength measurements you have to use an

Thanks a lot Sam ! It is an open door to stress the importance of having access to the proper schematics... I do hope that HP did not make a mistake by putting the only HP8711B module into the HP8711A

Thanks. 73 (Regards). Max K 4 O D S. I've Never Lost the Wonder. Sent: Tuesday, May 16, 2023 11:34 PM To: [email protected] Subject: Re: [Test Equipment Design &

You might try Artek Manuals as they have a clip for the HP8711B which IIRC is just an upgrade of the CPU/Video board. They have a complete set for 19.00USD http://artekmanuals.com/manuals/hp-manuals/

I sent you a private reply but I did find my original scan on my laptop. The index for the CLIP shows only the 50 Ohm version so unfortunately that is all that I have. I also uploaded those to

I scanned that original manual for HP and they put it up on their site several years ago. I scanned every page that was in the manual. I still have the manual but will have to get it back from the

I am looking for the schematics of the A5 Receiver Assembly for an HP8711A. HP's relevant Component Level Repair Service Guide ( # 08711-9004) is giving the wrong information. There the schematics are

For those who want the equations, here they are: 1) The capacitance per length is 1/(Zo*v), where v is the speed of light in the cable. For RG58, v is 2/3 the free-space speed of light, so you get

No equations to remember - just rules of thumb. The higher the Z, the lower the C. I don't recall the exact numbers, but I think 50 ohm cable is about 30 pF/foot, while 75 ohm is about 25 or so, and

Ed. I’m afraid I don’t remember all of my transmission line equations. Please tell us how it’s done. 73 (Regards). Max K 4 O D S. I've Never Lost the Wonder. Sent: Tuesday, May 16, 2023 2:25 PM

You can also do it by measuring the capacitance, if you know the length. Ed

The reactive part of the impedance of resistors of this value is unpredictable at best. Of course for RF amplifiers the value would have to be scaled down quite a lot. Even so resistors still have

I saw this about Great Scott developing an RF testing platform. Appears to be in early development. https://greatscottgadgets.com/2023/05-04-development-of-a-universal-radio-test-instrument/ -- Dave,

Once you determine the signal levels, from the amplifier sample port, as presented to the SpecAn, simulate that input with two isolated signal generators (Combined via 3dB hybrids and isolating pads)

In order to measure the IMD levels, unless the performance of the amplifier is terrible, it will have to be operated near it upper limit otherwise the IMD products will be so small as not to be

Hi Jeff: The paper on Gore's web page is talking about high-power, multichannel systems. The Langford paper is talking about the second order intercept of an active antenna and the feed line that

I would disagree with Tom regarding " Properly functioning cables and connectors" not being non-linear. There is always some non-linearity, it just depends on the level. Even the slightest amount of

Well, everything is nonlinear to sone degree, but that’s pedantry and not useful engineering. We’re looking at a claimed 20dB degradation in intercept. That’s well beyond anything that can be