Information on Racal Coupling Unit 11-0167 Wanted - UK Vintage Radio Repair and Restoration Discussion Forum

g0pxg mike · 12th Oct 2013, 2:10 pm

Hi all, can anyone please help with any info on a Racal 11-0167 coupling unit.
Such as max frequency, wattage, and attenuation tap off volts etc.

I have searched the WWW with no luck. I have a Marconi TF2304 AM /FM modulation meter and I am trying to set it up.

I know the Marconi has what is called a sniffer and wonder if the 11-0167 is similar, many thanks for any help mike

g0pxg mike · 13th Oct 2013, 6:48 pm

Have attached photo of item

glowinganode · 13th Oct 2013, 11:40 pm

Hi Mike, if you could carry out resistance measurements between the three connectors it may shed some light.
Chances are it's a nominal 50 ohms, and the tap off is likely to be a round figure, -40dB or -60dB for monitoring with a spec-an (assuming a suitably rated and impedance load is connected to the output connector)
If it is -60dB, then expect a direct connection between the "UHF" (or maybe "N"), and 25k between them and the bnc inner, and 50 ohms between the bnc inner and the body.
If you have a signal generator with a calibrated attenuator, it's easy enough to determine the attenuation and useable frequency range. As for power rating, that's any body's guess, but should be good for 100 W.
However, I could be completely wrong, it might actually be a directional coupler....
Rob.

g0pxg mike · 13th Oct 2013, 11:54 pm

Cheers Rob, I will give it a try with those figures and see if I can get a result.
The most I want power wise is 100 watts into the load and hope the tap off attenuates OK
many thanks mike

karesz* · 16th Oct 2013, 3:46 pm

Mike,
you can read here some details over that "Thru-line Connector".
Karl

Paulg3ydy · 16th Oct 2013, 5:29 pm

This mentioned in the Racal Dana 9008 Service Manual. It is just a sniffer Like to Marconi one.

The handbook is available on the web for download. There is also a Yahoo group dedicated to Racal Dana you may find more help there.

Paul

g0pxg mike · 18th Oct 2013, 6:01 pm

hi there all. I have done some checks on the coupler there is continuity across the tee piece through but on the b n c plug internally there is a small shorting pickup link which I think is adjustable I have put 5 watts through the coupler into a dummy load hoping to be able to read some sort of signal off the coupler but no joy should the coupler maybe have something else other than a pickup link or is this correct ? the coupler just seems unresponsive to any signal put through maybe it needs higher power not sure cheers mike

12th Oct 2013, 2:10 pm	#1
g0pxg mike Retired Dormant Member Join Date: Nov 2008 Location: Manchester. Posts: 6	Information on Racal Coupling Unit 11-0167 Wanted Hi all, can anyone please help with any info on a Racal 11-0167 coupling unit. Such as max frequency, wattage, and attenuation tap off volts etc. I have searched the WWW with no luck. I have a Marconi TF2304 AM /FM modulation meter and I am trying to set it up. I know the Marconi has what is called a sniffer and wonder if the 11-0167 is similar, many thanks for any help mike Last edited by AC/HL; 12th Oct 2013 at 2:42 pm. Reason: Single sentance split

13th Oct 2013, 6:48 pm	#2
g0pxg mike Retired Dormant Member Join Date: Nov 2008 Location: Manchester. Posts: 6	Re: Information on Racal Coupling Unit 11-0167 Wanted Have attached photo of item Attached Thumbnails

13th Oct 2013, 11:40 pm	#3
glowinganode Octode Join Date: Apr 2009 Location: Aylesbury, Buckinghamshire, UK. Posts: 1,522	Re: Information on Racal Coupling Unit 11-0167 Wanted Hi Mike, if you could carry out resistance measurements between the three connectors it may shed some light. Chances are it's a nominal 50 ohms, and the tap off is likely to be a round figure, -40dB or -60dB for monitoring with a spec-an (assuming a suitably rated and impedance load is connected to the output connector) If it is -60dB, then expect a direct connection between the "UHF" (or maybe "N"), and 25k between them and the bnc inner, and 50 ohms between the bnc inner and the body. If you have a signal generator with a calibrated attenuator, it's easy enough to determine the attenuation and useable frequency range. As for power rating, that's any body's guess, but should be good for 100 W. However, I could be completely wrong, it might actually be a directional coupler.... Rob. __________________ We have done so much, for so long, with so little, we are now qualified to do anything with nothing.

13th Oct 2013, 11:54 pm	#4
g0pxg mike Retired Dormant Member Join Date: Nov 2008 Location: Manchester. Posts: 6	Re: Information on Racal Coupling Unit 11-0167 Wanted Cheers Rob, I will give it a try with those figures and see if I can get a result. The most I want power wise is 100 watts into the load and hope the tap off attenuates OK many thanks mike

16th Oct 2013, 3:46 pm	#5
karesz* Heptode Join Date: Jun 2010 Location: Zurich, Switzerland Posts: 538	Re: Information on Racal Coupling Unit 11-0167 Wanted Mike, you can read here some details over that "Thru-line Connector". Karl Last edited by karesz; 16th Oct 2013 at 4:01 pm.*

16th Oct 2013, 5:29 pm	#6
Paulg3ydy Diode Join Date: Oct 2013 Location: Chelmsford, Essex, UK. Posts: 9	Re: Information on Racal Coupling Unit 11-0167 Wanted This mentioned in the Racal Dana 9008 Service Manual. It is just a sniffer Like to Marconi one. The handbook is available on the web for download. There is also a Yahoo group dedicated to Racal Dana you may find more help there. Paul

18th Oct 2013, 6:01 pm	#7
g0pxg mike Retired Dormant Member Join Date: Nov 2008 Location: Manchester. Posts: 6	Re: Information on Racal Coupling Unit 11-0167 Wanted hi there all. I have done some checks on the coupler there is continuity across the tee piece through but on the b n c plug internally there is a small shorting pickup link which I think is adjustable I have put 5 watts through the coupler into a dummy load hoping to be able to read some sort of signal off the coupler but no joy should the coupler maybe have something else other than a pickup link or is this correct ? the coupler just seems unresponsive to any signal put through maybe it needs higher power not sure cheers mike