From: [email protected] <[email protected]> On Behalf Of Tom Lee via groups.io
Sent: Thursday, February 10, 2022 8:49 PM
To: [email protected]
Subject: Re: [HP-Agilent-Keysight-equipment] [HP-Agilent-KI eysight-equipment] FM Tuner alignment generator?..

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Hi Bruce,

Although I've used the 8640 for FM alignment on occasion -- with great results -- I wouldn't want to have to use it on a regular basis. The FM modulator doesn't support a large enough deviation to use the instrument as a sweeper for tuning up a 10.7MHz IF chain, so you have to do it manually. As much as I love that sig gen, it really wasn't born for this particular purpose. The 8601A, on the other hand, was. The Sencore is definitely a step down, but it still gets the job done. In pre-Covid times, I regularly saw these at e-Fleas for a song. Or maybe it was the same unit, sitting unsold...

I never laid hands on an ST-1000. It sounds like a good bit of kit. Thanks for mentioning it.

--Cheers,
Tom

-- 

Prof. Thomas H. Lee

Allen Ctr., Rm. 205

350 Jane Stanford Way

Stanford University

Stanford, CA 94305-4070

I worked at a boutique hifi shop for a few years around 2015. I had an 8640 and it was fime for aligning FM tuners, as well as AM/SW and the occasional communications receiver. The shop had a Sound Technologies ST-1000, but the other technician laid total claim to it. I got a Heathkit generator for working on? stereo FM decoders. Considering the technical standards and audio processing of stations in this area, a tip top quality alignment with a sweep generator would? be a waste of time.? I did borrow and use a spectrum analyzer with a tracking generator to repair a really beaten up Marantz 10 tuner. Trying to align an IF with Butterworth filters can drive you crazy, especially if you don't have the secret factory repair manual. I never had an unhappy customer.

?? Bruce Gentry, KA2IVY

On 2/10/22 15:47, Dave Brown wrote:

Probably hard to find these days, but an 8690 sweeper mainframe with the

solid state 8698 100 KHz to 110 MHz plugin should do the job.

 The 8698/8690 combo? has a full range calibrated attenuator on the

output(+10 to -110 dBm) and both internal and external modulation

capabilities are available. But- it IS big and heavy!

DaveB, NZ

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-----Original Message-----

From: [email protected]

[mailto:[email protected]] On Behalf Of tony sayer

Sent: Friday, February 11, 2022 08:06

To: [email protected]

Subject: [HP-Agilent-Keysight-equipment] FM Tuner alignment generator?..

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Does anyone know of a HP signal generator thats got a sweep section for FM

(87.5 - 108 MHz) tuner alignment?

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The old Sound technology ST1000 was ideal for that but now long out of

production but seeing that in the UK at least the FM Broadcast band is to be

retrained till at least 2030 and we do have some FM Rebroadcast receivers to

look after, that would be a useful unit to have!

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Thanks if anyone can recommend an HP one...

--

Tony Sayer

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