Forums :: NEW! Web Resources :: Features :: Photo Gallery :: Vintage Radio Shows :: Archives
Support This Site: Contributors :: Advertise


It is currently Nov Sat 26, 2022 4:19 pm


All times are UTC





Post New Topic Post Reply  [ 12 posts ] 
Author Message
 Post subject: Great article on Transistor Transoceanics raises a question
PostPosted: Nov Wed 23, 2022 4:00 am 
Member
User avatar

Joined: Jul Fri 21, 2017 8:58 pm
Posts: 4300
Location: Union City Pa. USA
Location: Union City, Pa. USA
"The 7000Y was followed by the Royal 7000Y-1 in 1971, which uses chassis 18ZT40Z, and in 1972 by the Royal D7000Y, with chassis 500MD70. Although the circuits are very similar, different transistors are used in the various chassis, but the primary difference is in the VHF weather channel. The Royal 7000Y only offered 162.55mHz coverage. The Royal 7000Y-1 had a provision to change the crystal controlled VHF frequency, and the Royal D7000Y had continuous tuning of the weather band. The D7000Y is the more popular model due to the tunable weather band, and the inside of the front lid, with the compass, was changed from grey to black, a more attractive combination."

http://elmphotography.com/radios/radio31.htm


Just checked mine, it is the Royal 7000Y-1, chassis #18ZT40ZE
(Anyone know what the E letter means?), and according to the article, has a "provision to change the crystal".

The present crystal is for the stock 162.55 Mhz.

My local weather is 162.400 Mhz...

I'm hearing nothing on the stock 162.55 Mhz. crystal.

Are different crystals still available anywhere for these sets?

My example is in beautiful condition, not to be OCD, but it would be cool to have the weather band work here.

This is the set playing - love the sound of American craftsmanship!

https://youtube.com/shorts/iUUi-UCeIns?feature=share

_________________
"Invisible airwaves crackle with life
Bright antenna bristle with the energy"


Top
 Profile  
 
 Post subject: Re: Great article on Transistor Transoceanics raises a quest
PostPosted: Nov Wed 23, 2022 5:10 am 
Member
User avatar

Joined: Jan Tue 31, 2012 12:55 am
Posts: 21776
Location: Bryansford Village. Ireland.
I've never heard of a chassis 18ZT40ZE

Padgett Peterson's archived web-pages.
https://web.archive.org/web/20060715011 ... tohome.htm


That elmphotography page was written by Ed Morris, a member here... :)
Greg.


Top
 Profile  
 
 Post subject: Re: Great article on Transistor Transoceanics raises a quest
PostPosted: Nov Wed 23, 2022 7:03 am 
Member
User avatar

Joined: Jul Fri 21, 2017 8:58 pm
Posts: 4300
Location: Union City Pa. USA
Location: Union City, Pa. USA
egg wrote:
I've never heard of a chassis 18ZT40ZE

Padgett Peterson's archived web-pages.
https://web.archive.org/web/20060715011 ... tohome.htm


That elmphotography page was written by Ed Morris, a member here... :)
Greg.


Thank you, egg!

You are correct, there is no "E" suffix.

It does look like there is a "3" suffix.

Looks like the original earphones were never opened! :lol:


Attachments:
20221123_015358.jpg
20221123_015358.jpg [ 1.62 MiB | Viewed 227 times ]
20221123_015428.jpg
20221123_015428.jpg [ 673.12 KiB | Viewed 226 times ]
20221123_015419.jpg
20221123_015419.jpg [ 1.65 MiB | Viewed 226 times ]

_________________
"Invisible airwaves crackle with life
Bright antenna bristle with the energy"
Top
 Profile  
 
 Post subject: Re: Great article on Transistor Transoceanics raises a quest
PostPosted: Nov Wed 23, 2022 7:17 am 
Member
User avatar

Joined: Jul Fri 21, 2017 8:58 pm
Posts: 4300
Location: Union City Pa. USA
Location: Union City, Pa. USA
egg wrote:
I've never heard of a chassis 18ZT40ZE

Padgett Peterson's archived web-pages.
https://web.archive.org/web/20060715011 ... tohome.htm


That elmphotography page was written by Ed Morris, a member here... :)
Greg.


Just looked at the information you so kindly provided.

The "3" suffix tells me my set is the Royal 7000, not the 7000-1 which came later.

I am still in love with this set, thanks for clearing things up for me!

_________________
"Invisible airwaves crackle with life
Bright antenna bristle with the energy"


Top
 Profile  
 
 Post subject: Re: Great article on Transistor Transoceanics raises a quest
PostPosted: Nov Thu 24, 2022 6:59 am 
Member

Joined: Jun Sun 15, 2014 4:37 pm
Posts: 2402
Location: Montreal, Quebec
The problem with crystals is demand has mostly dried up. Fifty years ago, you had little choice. Butas synthesizers moved in, demand dropped drastically. Every two way radio needed two crystals per radio.
Every scanner needed one crystal per channel. CB sets needed two crystals per channel, exceptfor the ones that used fewer and mixed the output together. Most of the crystals today are made for standard frequencies. Custom ground crystals are really expensive, and few places do it.

The problem is accentuated by the fact that many crystals aren't interchangeable. They have to fit the radio. The actual frequency variesby the intermediate frequency the radio uses, and how itgets to that frequency.

Your real hope is to find someone selling a crystal for the Transoceanic for the right frequency. Given the age, it may have been before there was more than one Weather radio frequency.

I bought a pair of used FRS walkie talkies to play with, discovered they tuned all the Weather channels. So does my Baofeng walkie talkie.


Top
 Profile  
 
 Post subject: Re: Great article on Transistor Transoceanics raises a quest
PostPosted: Nov Thu 24, 2022 7:41 am 
Member
User avatar

Joined: May Tue 05, 2009 1:30 am
Posts: 1341
Location: Sask, Canada
You could look into grinding your own crystal to suit, bit of an art as I understand it.

_________________
Another day older and deeper in debt.


Top
 Profile  
 
 Post subject: Re: Great article on Transistor Transoceanics raises a quest
PostPosted: Nov Thu 24, 2022 7:58 am 
Member

Joined: Jun Sun 15, 2014 4:37 pm
Posts: 2402
Location: Montreal, Quebec
You can only easily grind crystals that are old enough to havescrews to open the case. The metal cased ones, as used in the Transoceanic are much harder to grind.

Grinding moves crystals up. But it's really meant for a slight adjustment. Soyou need a crystal close to the desired frequency, but lower.


Top
 Profile  
 
 Post subject: Re: Great article on Transistor Transoceanics raises a quest
PostPosted: Nov Thu 24, 2022 2:28 pm 
Member
User avatar

Joined: May Wed 18, 2011 1:40 am
Posts: 6568
Location: Littleton, MA
You might be able to feed the crystal oscillator from one of the new-fangled programmable oscillator chips, pre-programmed to the right frequency. You’d probably want an attenuator between the chip output and the crystal input, and capacitive coupling to avoid upsetting the bias on the oscillator.

_________________
Steve Byan https://www.byan-roper.org/steve/steve-at-play/


Top
 Profile  
 
 Post subject: Re: Great article on Transistor Transoceanics raises a quest
PostPosted: Nov Thu 24, 2022 4:11 pm 
Member
User avatar

Joined: Nov Sun 29, 2020 4:59 pm
Posts: 678
Location: Northeast Illinois
Location: Carol Stream, Illinois 60188
Some good information in this thread as to the actual crystal frequency needed --

https://antiqueradios.com/forums/viewto ... 4&t=358494

- Jim


Top
 Profile  
 
 Post subject: Re: Great article on Transistor Transoceanics raises a quest
PostPosted: Nov Thu 24, 2022 11:11 pm 
Member
User avatar

Joined: Jul Fri 21, 2017 8:58 pm
Posts: 4300
Location: Union City Pa. USA
Location: Union City, Pa. USA
mblack wrote:
The problem with crystals is demand has mostly dried up. Fifty years ago, you had little choice. Butas synthesizers moved in, demand dropped drastically. Every two way radio needed two crystals per radio.
Every scanner needed one crystal per channel. CB sets needed two crystals per channel, exceptfor the ones that used fewer and mixed the output together. Most of the crystals today are made for standard frequencies. Custom ground crystals are really expensive, and few places do it.

The problem is accentuated by the fact that many crystals aren't interchangeable. They have to fit the radio. The actual frequency variesby the intermediate frequency the radio uses, and how itgets to that frequency.

Your real hope is to find someone selling a crystal for the Transoceanic for the right frequency. Given the age, it may have been before there was more than one Weather radio frequency.

I bought a pair of used FRS walkie talkies to play with, discovered they tuned all the Weather channels. So does my Baofeng walkie talkie.


Thanks, mblack!

For a few years, I worked at a company in Erie Pa. "Bliley Eleectric".

My job - grinding crystals on Blanchard grinder for the U.S. Army Signal Corps!


:lol:

_________________
"Invisible airwaves crackle with life
Bright antenna bristle with the energy"


Top
 Profile  
 
 Post subject: Re: Great article on Transistor Transoceanics raises a quest
PostPosted: Nov Thu 24, 2022 11:14 pm 
Member
User avatar

Joined: Jul Fri 21, 2017 8:58 pm
Posts: 4300
Location: Union City Pa. USA
Location: Union City, Pa. USA
marko wrote:
You could look into grinding your own crystal to suit, bit of an art as I understand it.


It is indeed an art.

It was, at one time, my job.

The volume we put out required heavy industrial equipment.

_________________
"Invisible airwaves crackle with life
Bright antenna bristle with the energy"


Top
 Profile  
 
 Post subject: Re: Great article on Transistor Transoceanics raises a quest
PostPosted: Nov Thu 24, 2022 11:16 pm 
Member
User avatar

Joined: Jul Fri 21, 2017 8:58 pm
Posts: 4300
Location: Union City Pa. USA
Location: Union City, Pa. USA
stevebyan wrote:
You might be able to feed the crystal oscillator from one of the new-fangled programmable oscillator chips, pre-programmed to the right frequency. You’d probably want an attenuator between the chip output and the crystal input, and capacitive coupling to avoid upsetting the bias on the oscillator.


That is interesting!

First I have heard of these chips, thank you!

_________________
"Invisible airwaves crackle with life
Bright antenna bristle with the energy"


Top
 Profile  
 
Post New Topic Post Reply  [ 12 posts ] 

All times are UTC


Who is online

Users browsing this forum: Blustar1, lorenz200w and 6 guests



Search for:
Jump to:  




































Privacy Policy :: Powered by phpBB