wrote:
Hi Alain,

just send the schematic you need @ your email address.

Far from pefect scan in two parts, the original is large. Hope it will
help, with scissors and adhesive tape I think it can. Feddback
welcome, other request of this schematic also.

Schéma envoyé directement à votre adresse mail.... Etc!

Thierry Stora

http://www.chapelon.net



Thank you Thierry for sending the schematic to Alain. I wish Alain well
in his radio astronomy ventures with 60 year old radio equipment.

John

Litzendraht wrote:
wrote:

Hi Alain,

just send the schematic you need @ your email address.

Far from pefect scan in two parts, the original is large. Hope it will
help, with scissors and adhesive tape I think it can. Feddback
welcome, other request of this schematic also.

Schéma envoyé directement à votre adresse mail.... Etc!

Thierry Stora

http://www.chapelon.net




Thank you Thierry for sending the schematic to Alain. I wish Alain well
in his radio astronomy ventures with 60 year old radio equipment.

John

Hello every one ,thanks for your precious help, thanks Thierry for the
schematics well arrived at home and well printed ,time will be long now
the bc624 come from Honolulu....yesterday I went to my garage and
got the bc 625 (transmitter) I already have ,it is in nice condition.The
reason I plan to use the bc624 in radio-astronomy is simple :it is a
radio-set I found on ebay at a reasonable price (shipping included )
(before ,I had looked at hamfests in France ,and did not find receivers
in vhf old enought-1960 was the oldest),I am a long time om ,and doing
radio-astronomy on the sun since 20 years with 'good' receivers,this
project is to test with the receivers of the time of the discovery of
radio-astronomy,nostalgia ...
For those interested there is a book 'The early years of
radio-astronomy' at Cambride university press ,that describes the
material used at that time it is very interesting . In fact Reber
at the beginning around 1939 used a 31 feet parabola and a trf amplifier
with 4* 955 acorn tubes amplifier,and a 953 acorn diode ....the bc624
is of the nearly same time but as a superhet will be more sensitive ,the
9003 input tube is the successor of the 955 acorn in an another 'box'.
This is for some explanations of all the questions.
Of course if a scr522 fan club is done ,count on me with the bc625 and
bc 624.
Thanks again all of you 73 alain f1gqb

nierveze wrote:
the 9003 input tube is the successor of the 955 acorn in an another 'box'.


Alain,
I was pleased that you mentioned the 9003 being the successor of an
acorn tube. I started to mention that when I said I replaced the 9003's
with 6AK5's. There was a series of 7 pin minatures that replicated some
of the acorns.

I think the 9003 was actually the replacement for a 954 pentode acorn
and the 9002 (also used in the BC 624) replaced a 955 triode.

My B&W grid dip meter that I've had for a hundred years uses a 955
oscillator. And I did some tinkering in those early days with portable
2 metre equipment with 957 battery triodes. One small transmitter I
built used a single 957 ultra-audion oscillator and I modulated it with
a Shure magnetic microphone in series with the grid resistor ground
return. Pretty simple circuit. It sounded great on the BC 624!

What type of antenna array do you plan to use? Do you know the
frequency range that was used in the early experiments that you
mentioned?

John

Litzendraht wrote:
nierveze wrote:

the 9003 input tube is the successor of the 955 acorn in an another 'box'.



Alain,
I was pleased that you mentioned the 9003 being the successor of an
acorn tube. I started to mention that when I said I replaced the 9003's
with 6AK5's. There was a series of 7 pin minatures that replicated some
of the acorns.

I think the 9003 was actually the replacement for a 954 pentode acorn
and the 9002 (also used in the BC 624) replaced a 955 triode.

My B&W grid dip meter that I've had for a hundred years uses a 955
oscillator. And I did some tinkering in those early days with portable
2 metre equipment with 957 battery triodes. One small transmitter I
built used a single 957 ultra-audion oscillator and I modulated it with
a Shure magnetic microphone in series with the grid resistor ground
return. Pretty simple circuit. It sounded great on the BC 624!

What type of antenna array do you plan to use? Do you know the
frequency range that was used in the early experiments that you
mentioned?

John

Hello John
first of all to share my happiness ,my bc624 is at home ,it took just a
week to come from Honolulu to France .This fact itself is
marvelous!!!It is in perfect good condition.It is marvelous to see 60
years old radio-set in such a nice condition ,it is nearly complete
,only the front panel mechanic to select channels ,has been removed .As
a begining I plan to use simple 2m yagi ,I have three of then 'tailored'
on 150 mhz that is an official band of radio-astronomy (shared with
other services ).In the beginning of radio-astronomy after several test
on microwave (around 3ghz) ,G.Reber finally used 169mhz ,a frequency
that is still in use in radio-astronomy
in several observatories .Here I have been using that frequency with
modified vhf radio-reciver (just cut one turn out of the input coils
,and tune again ,and tv antennas are ok)alas now there is lot of qrm by
vhf relais ,it is a local problem .I'll keep you informed .
You are right about the tubes ,I also have a gdo of that kind ,and
several acorn tubes .Thanks ,good bye 73 alain f1gqb

Litzendraht wrote:

Thank you Thierry for sending the schematic to Alain. I wish Alain well
in his radio astronomy ventures with 60 year old radio equipment.

I have them all the time. Can't somebody DO something about Jupiter
and the sun? They're always causing interference for me. Can't the
FCC get them shut down or something?
--scott


--
"C'est un Nagra. C'est suisse, et tres, tres precis."

Scott Dorsey wrote:

Litzendraht wrote:

Thank you Thierry for sending the schematic to Alain. I wish Alain well
in his radio astronomy ventures with 60 year old radio equipment.

I have them all the time. Can't somebody DO something about Jupiter
and the sun? They're always causing interference for me. Can't the
FCC get them shut down or something?
--scott

--
"C'est un Nagra. C'est suisse, et tres, tres precis."


Yeah! Where is "Marvin the Martian" when you need him? I guess that
he is still looking for a Illudium Q-36 Explosive Space Modulator.


--
Service to my country? Been there, Done that, and I've got my DD214 to
prove it.
Member of DAV #85.

Michael A. Terrell
Central Florida