[MRCA] R1155

[B. Smith]

The R1155 is a great project. Most of the info on the set and its 
accessories is available from numerous British sites. The accessories 
are a little scarce but are available through British collectors etc. 
The shock mount is fairly scarce. The British Army coffee cup is fairly 
common.
Z



On 1/10/2023 11:49 AM, Ray Fantini wrote:
>
> Got a R1155 that I am going thru for someone. It’s all original on the 
> outside although someone played around with the innards a bit. The 
> owner wants it to appear all original on the outside and be functional 
> as a receiver on the inside.
>
> I have played around with a couple 1155 before so know about all the 
> leaky capacitors that will have to be replaced but had a couple questions.
>
> First, I cut down an old Jones plug to fit the connector on the front 
> (P1) but noticed that there are two antenna inputs, pin 1 for HF and 
> pin 2 for the trailing wire antenna, the LF band. Any reason why I 
> cannot just connect pin 1 & 2 together and bring that out on some 
> coax?  Can pick up the ground on pin 4 and figure if it’s a short coax 
> jumper can put a BNC or something on it and the owner can use that to 
> hook up his antennas. Wonder if anyone has gone as far as to mount a 
> coax connector on the plug shell?
>
> ALL of this goes on the plug and not the radio!
>
> Second, have to build up an external power supply and was thinking of 
> running a reduced B+ of around maybe 175 volts or so. Don’t see where 
> this will be any issue unless there is some magic voltage that has to 
> be used for the eye tube.
>
> May also build a one tube audio amplifier like a 6AQ5 or 6V6 into the 
> power supply being the audio from the receiver would be somewhat week 
> and imagine the owner will want to drive an external speaker.
>
> What would be an appropriate box to use for housing the external power 
> supply and speaker?
>
> One option may be like a old speaker cabinet that can also accommodate 
> the power supply and amplifier.
>
> Third, this is the tough one- being it still has all the ADF stuff 
> installed, although someone removed the three tubes and the coils are 
> beat up its not that hard to come up with the external cross needle 
> indicator and would there be any value in connecting that up? Do not 
> have the loop antenna and don’t think I will see one anytime soon but 
> think at least without the antenna you can play with all the balance 
> and assorted knobs on the radio being they are all still there.
>
> If it were my own receiver would take all the ADF stuff out but the 
> owner wants this to look all original and I have already told them 
> that I can get it working for them but a lot of the stuff on the radio 
> will not do anything without the loop antenna and external display.
>
> Ray F/KA3EKH
>
>
> ______________________________________________________________
> MRCA mailing list
> Home:http://mailman.qth.net/mailman/listinfo/mrca
> Help:http://mailman.qth.net/mmfaq.htm
> Post:mailto:MRCA at mailman.qth.net
>
> This list hosted by:http://www.qsl.net
> Please help support this email list:http://www.qsl.net/donate.html
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mailman.qth.net/pipermail/mrca/attachments/20230110/f48e91a2/attachment-0001.html>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: semk4che.gif
Type: image/gif
Size: 9511 bytes
Desc: not available
URL: <http://mailman.qth.net/pipermail/mrca/attachments/20230110/f48e91a2/attachment-0002.gif>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: k4cheR1155.jpg
Type: image/jpeg
Size: 330890 bytes
Desc: not available
URL: <http://mailman.qth.net/pipermail/mrca/attachments/20230110/f48e91a2/attachment-0001.jpg>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: semk4che.gif
Type: image/gif
Size: 9511 bytes
Desc: not available
URL: <http://mailman.qth.net/pipermail/mrca/attachments/20230110/f48e91a2/attachment-0003.gif>