FAZssb converter, B40 and Radiospectroscope HTC-4701 - UK Vintage Radio Repair and Restoration Discussion Forum

QWENIX · 1st Oct 2015, 9:34 pm

Hello just to show you what keeps the Dutch Murphy Community off streets.

First a link to the FAZ restoration connectors sockets and plugs. I helped this guy with the plugs, sockets assembling orientation and original wire. Now this Faz is running again. And back to its original looks.

http://www.gloeidraad.nl/radioforum/index.php?id=202997

Next a very rare radiospectroscope built especially by Van der Heem ordered by the Dutch Royal Navy. This radiospecroscope HTC-4701 is specially built for a modified (by the royal navys electronics service department) B40. Ive been looking for almost ten years or more for this piece of equipment. It looks like a oscilloscope/networkanalyser but will show all transmitters signals within 100kHZ + and- aside the tuned frequency. So tuned on 7100 KHz it will show all between 7000 and 7200 kHZ max .... I will be back on this subject as soon as this 44kgs beast comes alive.

http://www.gloeidraad.nl/radioforum/index.php?id=201776

best regards

Qwenix

Radio Wrangler · 1st Oct 2015, 10:51 pm

I quite like the RA117/MA79 pair with matching accoutrements.

David

turretslug · 1st Oct 2015, 11:07 pm

That radio spectroscope is an intriguing device, I hope that the tube is in good order.

For some reason, "gravity well" comes to mind looking at that stack of B40s and RA17s....

QWENIX · 2nd Oct 2015, 6:59 am

I saw that radiospectroscope on a secondhand site. It was for sale by a radio amateur who lives very close (lets say 20 minutes drive: neighbour) to my friend murphy collector (also radioamateur) as well. So this murphy collector became my eyes and ears on a 120 miles distance. My friend told me to go for the deal. So some surplus racal stuff was swapped. And in the end everybody satisfied with the deal. It really was a win win situation because my friend has a new nice "neighbour".

The radiospectroscope is very very very rare. Counting all the seriesnumbers "van der heem" must have produced about max 30 pieces. I now know 4 owners in Holland.
The CRT should be ok. Havent fired it up yet.

See this link: http://www.vanderheem.info/htc-4701.html

QWENIX · 5th Oct 2015, 12:05 pm

Pieces of wire soldered on the outside from the sockets were removed so that the right plugs could be used. Took the variac and a glowing bulb 60W in line to take up possible shortcicuit currents. Connected the radiospectroscope on to it. Result: the CRT is in working order. Checking the antenna input: connected a spring used as antenna and took a piece of aluminium and rubbed it against the antenna. Result showed big amplitudes. So this thing is general in working order.

The B40B is also in working order but as many times the Afgain pot should be replaced as there is no posibility to rotate the knob.

1st Oct 2015, 9:34 pm	#1
QWENIX Pentode Join Date: Jan 2006 Location: Amsterdam, The Netherlands Posts: 180	FAZssb converter, B40 and Radiospectroscope HTC-4701 Hello just to show you what keeps the Dutch Murphy Community off streets. First a link to the FAZ restoration connectors sockets and plugs. I helped this guy with the plugs, sockets assembling orientation and original wire. Now this Faz is running again. And back to its original looks. http://www.gloeidraad.nl/radioforum/index.php?id=202997 Next a very rare radiospectroscope built especially by Van der Heem ordered by the Dutch Royal Navy. This radiospecroscope HTC-4701 is specially built for a modified (by the royal navys electronics service department) B40. Ive been looking for almost ten years or more for this piece of equipment. It looks like a oscilloscope/networkanalyser but will show all transmitters signals within 100kHZ + and- aside the tuned frequency. So tuned on 7100 KHz it will show all between 7000 and 7200 kHZ max .... I will be back on this subject as soon as this 44kgs beast comes alive. http://www.gloeidraad.nl/radioforum/index.php?id=201776 best regards Qwenix

1st Oct 2015, 10:51 pm	#2
Radio Wrangler Moderator Join Date: Mar 2012 Location: Fife, Scotland, UK. Posts: 22,876	Re: FAZssb converter, B40 and Radiospectroscope HTC-4701 I quite like the RA117/MA79 pair with matching accoutrements. David __________________ Can't afford the volcanic island yet, but the plans for my monorail and the goons' uniforms are done

1st Oct 2015, 11:07 pm	#3
turretslug Dekatron Join Date: Nov 2011 Location: Surrey, UK. Posts: 4,395	Re: FAZssb converter, B40 and Radiospectroscope HTC-4701 That radio spectroscope is an intriguing device, I hope that the tube is in good order. For some reason, "gravity well" comes to mind looking at that stack of B40s and RA17s....

2nd Oct 2015, 6:59 am	#4
QWENIX Pentode Join Date: Jan 2006 Location: Amsterdam, The Netherlands Posts: 180	Re: FAZssb converter, B40 and Radiospectroscope HTC-4701 I saw that radiospectroscope on a secondhand site. It was for sale by a radio amateur who lives very close (lets say 20 minutes drive: neighbour) to my friend murphy collector (also radioamateur) as well. So this murphy collector became my eyes and ears on a 120 miles distance. My friend told me to go for the deal. So some surplus racal stuff was swapped. And in the end everybody satisfied with the deal. It really was a win win situation because my friend has a new nice "neighbour". The radiospectroscope is very very very rare. Counting all the seriesnumbers "van der heem" must have produced about max 30 pieces. I now know 4 owners in Holland. The CRT should be ok. Havent fired it up yet. See this link: http://www.vanderheem.info/htc-4701.html

5th Oct 2015, 12:05 pm	#5
QWENIX Pentode Join Date: Jan 2006 Location: Amsterdam, The Netherlands Posts: 180	Re: FAZssb converter, B40 and Radiospectroscope HTC-4701 Pieces of wire soldered on the outside from the sockets were removed so that the right plugs could be used. Took the variac and a glowing bulb 60W in line to take up possible shortcicuit currents. Connected the radiospectroscope on to it. Result: the CRT is in working order. Checking the antenna input: connected a spring used as antenna and took a piece of aluminium and rubbed it against the antenna. Result showed big amplitudes. So this thing is general in working order. The B40B is also in working order but as many times the Afgain pot should be replaced as there is no posibility to rotate the knob.