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 Post subject: Zenith S-7000 Wireless and a 1.63 MHz Crystal
PostPosted: Jun Tue 16, 2020 12:25 am 
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Joined: Jun Mon 15, 2020 10:24 pm
Posts: 24
Hello,

How are the programmable 1.63 MHz Crystals for sale on Digi-Key?

I would like to use it and build for myself the low powered Antique Electronics Supply Zenith S-7000 Wireless Record Player for home use.

Has anyone built one of these?

Thanks!

ph


Last edited by pharrison on Jun Tue 16, 2020 11:37 am, edited 4 times in total.

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 Post subject: Re: Assembler needed for an AM tube transmitter
PostPosted: Jun Tue 16, 2020 2:12 am 
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Location: Dallas, TX
What part of the country are you in?
There is a circuit for producing the AM and frequencies from a 10.24 MHz crystal which may be easier to find.

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 Post subject: Re: Assembler needed for an AM tube transmitter
PostPosted: Jun Tue 16, 2020 3:15 am 
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Welcome to the forum. If you don't see a lot of interest in getting someone here to build it for you, it might be because we've been thoroughly immersed in FCC Part 15 rules that tend to have a dampening effect on building a transmitter for someone else who would be paying for the completed item.

If you are considering building it yourself, you can get plenty of help here.


EDIT: My posting may not make sense as it was a reply to the OP, which has been edited to be a completely different question. Note to self: When responding, use the quote function.l


Last edited by Macrohenry on Jun Tue 16, 2020 10:34 pm, edited 1 time in total.

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 Post subject: Re: Assembler needed for an AM tube transmitter
PostPosted: Jun Tue 16, 2020 8:26 am 
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^ Translated, it is a violation of FCC part 15 rules to provide a completed AM radio transmitter. The ppl who have been busted on this have had to pay thousands in fines.

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 Post subject: Re: Zenith S-7000 Wireless and a 1.63 MHz Crystal
PostPosted: Jun Tue 16, 2020 2:58 pm 
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pharrison wrote:
How are the programmable 1.63 MHz Crystals for sale on Digi-Key?
Can you provide a link or part number for this product? I couldn"t find a 1.63 MHz crystal.

Dave


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 Post subject: Re: Zenith S-7000 Wireless and a 1.63 MHz Crystal
PostPosted: Jun Tue 16, 2020 3:04 pm 
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AM Transmitter can be made with CD4053 and 1.6MHz square waves from CD4040 + 6.4MHz crystal. Want schematic?

1.63MHz is an odd Frequency. I don't expect to find any crystals. 1.6MHz makes more sense.

The CD4040 can also drive a 2n7000 mosfet directly with 1.6MHz square waves. LM386 can be the modulator. With LC output matching excellent sound quality can be obtained with the Transmitter feeding a 6 ft. wire antenna.

Ohh.. sorry.. I just googled zenith s-7000 and it's a valve based Transmitter! Ignore my comments.


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 Post subject: Re: Zenith S-7000 Wireless and a 1.63 MHz Crystal
PostPosted: Jun Tue 16, 2020 3:23 pm 
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pharrison, you seem to be changing what you are looking for quickly. The AES K-488 single tube transmitter, based on the Zenith S-7000 does not use a crystal.
There are many AM transmitter designs on the web, both tube and solid state.
I think the crystals from Digikey that you had in mind might be made to order ones.

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 Post subject: Re: Zenith S-7000 Wireless and a 1.63 MHz Crystal
PostPosted: Jun Tue 16, 2020 8:15 pm 
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If you want a kit tube transmitter, or an already built SS transmitter, go here;
https://www.6v6.co.uk/about-us.html
and click on "transmitters". They can sell built units because they are in England, and of course not subject to the FCC. Just don't get the one watt unit.

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 Post subject: Re: Zenith S-7000 Wireless and a 1.63 MHz Crystal
PostPosted: Jun Tue 16, 2020 9:27 pm 
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Spitfire, ok

Who has heard the Zenith S-7000 / AES kit?

Thanks!


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 Post subject: Re: Zenith S-7000 Wireless and a 1.63 MHz Crystal
PostPosted: Jun Tue 16, 2020 9:38 pm 
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The Wild Planet Radio DJ used a crystal that was divided down to the BC band. It was also possible to change that crystal and get lower in the BC band for 20's era radios. There were modulation and other small mods to improve the signal but none increase the power output. The data should still be online for it. Crystals are still available from Digi-Key... Limitation was the fact that about 4 to 5 different frequencies are possible and the tank circuit did not resonate well below 1250khz...

http://www.geocities.ws/raiu_harrison/m ... wprdj.html

YMMV

Chas

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 Post subject: Re: Zenith S-7000 Wireless and a 1.63 MHz Crystal
PostPosted: Jun Tue 16, 2020 10:47 pm 
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Dare4444 wrote:
AM Transmitter can be made with CD4053 and 1.6MHz square waves from CD4040 + 6.4MHz crystal. Want schematic?

1.63MHz is an odd Frequency. I don't expect to find any crystals. 1.6MHz makes more sense.

The CD4040 can also drive a 2n7000 mosfet directly with 1.6MHz square waves.


Yes, 6.4/4 MHz = 1.6 MHz. It MAY be possible to bend the frequency to 1.63 MHz by putting a cap in series with the 6.4 crystal. You'd need to experiment with the value. Given that the bending will be divided by 4, I have my doubts. Anyway learn more here: https://kc9on.com/ham-radio/crystals/svxo/

Is 1.63 your clearest frequency near the top of the AM band?


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 Post subject: Re: Zenith S-7000 Wireless and a 1.63 MHz Crystal
PostPosted: Jun Wed 17, 2020 12:28 am 
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Location: Rochester NY USA
The programmable oscillators (they're a synthesizer) have lots of phase nose, but that shouldn't be an issue on AM.

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 Post subject: Re: Zenith S-7000 Wireless and a 1.63 MHz Crystal
PostPosted: Jun Wed 17, 2020 12:46 pm 
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Tom Bavis wrote:
The programmable oscillators (they're a synthesizer) have lots of phase nose, but that shouldn't be an issue on AM.
Is special equipment required to program them? If so, what equipment?

Dave


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 Post subject: Re: Zenith S-7000 Wireless and a 1.63 MHz Crystal
PostPosted: Jun Wed 17, 2020 3:27 pm 
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Joined: Mar Thu 01, 2018 1:30 am
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Dave Doughty wrote:
Tom Bavis wrote:
The programmable oscillators (they're a synthesizer) have lots of phase nose, but that shouldn't be an issue on AM.
Is special equipment required to program them? If so, what equipment?

Dave


I shared a circuit of $12 synthesizer. It's on this forum. Frequency is selected by bit switches.


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 Post subject: Re: Zenith S-7000 Wireless and a 1.63 MHz Crystal
PostPosted: Jun Wed 17, 2020 8:49 pm 
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Thank you everyone for the detailed replies.


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 Post subject: Re: Zenith S-7000 Wireless and a 1.63 MHz Crystal
PostPosted: Jun Thu 18, 2020 1:23 pm 
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Location: Utica, NY 13502 (USA)
Dare4444 wrote:
Dave Doughty wrote:
Tom Bavis wrote:
The programmable oscillators (they're a synthesizer) have lots of phase nose, but that shouldn't be an issue on AM.
Is special equipment required to program them? If so, what equipment?
I shared a circuit of $12 synthesizer. It's on this forum. Frequency is selected by bit switches.
That is a great solution but I was referring to the "1.63 MHz crystal" that the OP found at DigiKey. They list many tiny, programmable, crystal oscillators that operate within that frequency range.

Dave


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 Post subject: Re: Zenith S-7000 Wireless and a 1.63 MHz Crystal
PostPosted: Jun Thu 18, 2020 1:35 pm 
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Location: Montreal, Quebec
I don't know, but from previous discussion I got the impression that those "crystals" were programmed before you got them and weren't changeable afterwards. So in essence they can "stock" every frequency, without all the stock.


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 Post subject: Re: Zenith S-7000 Wireless and a 1.63 MHz Crystal
PostPosted: Jun Fri 19, 2020 1:39 pm 
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Joined: Jun Mon 15, 2020 10:24 pm
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that was my impression also


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 Post subject: Re: Zenith S-7000 Wireless and a 1.63 MHz Crystal
PostPosted: Jun Sun 21, 2020 8:55 pm 
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Joined: Jan Tue 16, 2007 7:02 am
Posts: 3914
Location: Lexington, KY USA
Here is a link to the Rider print for the Zenith S-7000:

http://www.nostalgiaair.org/PagesByModel/657/M0025657.pdf

The S-7000 phono oscillator is pretty typical for this sort of thing. It is nowhere near an optimal solution for a homebrew project. If you have an original unit, it can work well enough to be an interesting thing to have, but is not a good basis for modifications or a scratch build.

Note that this design does not use a 1.63MHz crystial, or, indeed, any crystal at all. Trying to add a crystal to this unit is putting lipstick on the sow.

There are many better designs out there. Both tube and solid state.

You might want to think about what you are hoping to do here. Would you rather use tubes or make it solid state? We all like tubes, but solid state will probably be easier and less expensive for a given performance level. If this is for playing music through a big console, the quality of the signal is important. For talk radio, or the football game, perhaps not so much.

Ted
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 Post subject: Re: Zenith S-7000 Wireless and a 1.63 MHz Crystal
PostPosted: Jun Tue 23, 2020 12:36 pm 
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Joined: Jun Mon 15, 2020 10:24 pm
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Hi,

Would anyone recommend installing a 1 to 1 input transformer for the electric mains for safety?


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