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member - Sunday, December 11, 2011 at 14:16:59
BC348Q - made by the Wells Gardner Co. (USA). (Correction to above title*)

These receivers were common place in US Air-force aircraft during WW2, many of the BC348 series were made by different manufacturers.
The receiver chassis etc is of aluminium construction and was designed to be run from the aircraft's 28 volt supply via the receivers in built dynamotor which provides the HT voltage for the receivers circuits, the valve heaters are wired series parallel for 28 volt operation direct. The receiver employs eight valves and covers 200 Kc/s to 500 Kc/s and 1.5 Mc/s to 18 Mc/s in six bands, it has an IF frequency of 915 Kc/s. The receiver employs a BFO and Xtal filter.
The receiver pictured is in its original condition apart from the usual scratches etc It retains its original dynamotor, connecting plug and shock mount. The receiver has been powered up and does 'workie workie', I intend to go through it properly when time permits.
Shown on top of the receiver is the LS3 loudspeaker, so far as I am aware these were not normally issued with the receiver as the receiver is primarily a 'phones set, however this speaker will be used in conjunction with the receiver in the near future.

Lawrence. 11/11/2011

* Edited by Gallery administrator, Dec.17. The Photo. name is pending correction by me.
member - Sunday, December 11, 2011 at 06:09:40
The R1155 was built by several manufacturers; listed here under Marconi.

One of the most famous WW2 classic receivers, this particular receiver is the aluminium-cased version and is shown with its main inter-connecting lead fitted.
The early tuning drive mechanism (as shown) is a remarkably simple but effective and efficient piece of engineering and does its job well ~ if correctly serviced and set up.
This receiver retains all its original components except the front socket strap bar and a connecting lead to the top caps of the DF valves. The receiver is all 'workie workie' and works remarkably well today, given that it is a relatively simple main receiver design. Marconi did well to cram all its facilities into a relatively compact light-weight receiver.
The receiver has no ventilation as such and requires external LT and HT supplies for its power requirements.

Lawrence. 11/11/2011.

Minor edit. by Gallery admin., Dec. 17, 2011
member - Saturday, December 10, 2011 at 19:31:30
National HRO Senior, little introduction required for this all time classic receiver, for me the best of that era, simple elegant well thought out design both mechanicaly and electonicaly by Messers Millen & Hoover and the team. Used by amatures,forces and governments before, during and after the second world war, the basic design remained virtually unchanged throughout that period, a favourite of listening posts and diplomatic wireless operators. The HRO required a seperate power supply, this in combination with its good chassis layout and under chassis plug in coil arrangement gave the receiver excellent thermal stability for a receiver of that era, the well engineered PW Tuning Drive mechanism contributed to it's amazing frequency resetability and smooth bandspread action, the scale can easily be resolved to 500 C/s or less on the lower and mid bands. The simple xtal filter is still today fully functional and usefull for resolving SSB transmisions due to the variable bandwidth and notching facilities offered by it's two user controls in combination with the variable BFO. This receiver has had the front panel partly refurbished including the tuning dial, the original finish was and still is alligator skin texture not wrinkle, on the front panel imediately to the left of the tuning dial the original textured paint finish has been worn down to the base coat in a sweeping arc, no doubt by the finger of the operator while tuning and scribbling down code with the right hand. It still runs with all its original components bar two. it is shown with a general coverage coil set .9 - 2.05 Mc/s the coil set is serial numbered to the receiver and the bandspread coils shown else where in the gallery.
After working on other sets for a week or two it is always a pleasure to get this back on the bench with a cup of coco and do a bit of DX SWL for an hour or two. I love 'em

Lawrence. 11/11/2011
member - Saturday, December 10, 2011 at 18:32:06
HRO Senior bandspread coil set, all sets in full working condition, for me the ultimate in band changing design for a receiver of that era, others might not agree, the coils shown are serial number matched to the receiver shown in another photo in the gallery, the original logging scale covers had the usual symptoms of distortion, the coils are shown with a temprorary thin clear plastic sheet over the paper scales, hence the photographic reflections.

Lawrence. 11/11/2011.
member - Saturday, December 10, 2011 at 18:18:43
Cover for HRO Senior rack mounted version (shown elsewhere) the arrangement and size of the ventilation holes are different from others I have seen, left hand stud snapped off a long time ago (will replace) The receivers serial number had been painted on the top freehand for extra ID but has in the past been overpainted with black paint.

Lawrence 11/11/2011
member - Saturday, December 10, 2011 at 18:06:31
CAT_HF, communications receiver, originally from Rees-Mace, who were subsequently taken over by Pye Telecommunications, who continued the manufacture of this receiver. This model dates from 1953. Originally supplied to the British Admiralty. Freq. range is from 60 Kc/s to 32 Mc/s in 8 bands.
Note: Comms. radios supplied for Naval use often had an extended L.F. coverage, mainly for submarine communications.

Photo. submitted by Al.(Skywave): Dec. 10, 2011.
member - Saturday, December 10, 2011 at 17:56:56
Marconi CR300 & Type 889 PSU, Identification marks found put this receiver at 1945 or earlier, The Marconi CR300/1 ID plate has no Ser. No. stamped on it.
The receiver was in common use in the merchant fleet and some naval installations and possibly others. Single anode tuned capacity coupled RF stage, twin freqency IF stages...98 Kc/s bands 1 & 4 and 570 Kc/s on the other six bands. Frequency coverage 15 Kc/s to 25 Mc/s in 8 overlaping ranges. Modes: Phone/cw, no front user BFO frequency control, no xtal filter, audio filter: simple C/R or tuned narrow band L/C filter for CW. Built in emegency receiver crystal detector in case of total receiver failure (Board of Trade) RIS via socket on side of receiver coupled via filter to supressor grid of RF amp. RF & IF desensitising adjustment for when transmitting (Used via Tx relay) Xtal marker 500Kc/s in CR300/1, 690 Kc/s in CR300/2 (Harmonics = maritime call frequencies) For what's in it, it works well considering. Osc drift compensation is via a high value resistor connected directly across the HT and placed against one of the plates of a fixed air spaced capacitor, the plate being of bi metal construction. PSU runs off 230 AC or 24,110,220 DC, built in vibrator, rectifier can either be cold cathode gas or indirectly heated cathode conventional rectifier.

Posted by Lawrence 10/12/2011
member - Saturday, December 10, 2011 at 17:48:49
52 set ~ from Marconi. Dates from approx. the 1950's. A traditional single-conversion s/het. using 10 valves. Used by the U.K. military. Most of these receivers were manufactured in Canada in large quantities and was intended for use with a matching transmitter, however it is self-contained as a receiver, but does require an external power unit if used this way: 12 v. for the heaters and 160v. for HT. Size is 15" X 12" X 15" in its steel case.
Freq. coverage is from 1.75 to 16 Mc/s in three bands. The cramped tuning on the 14 Mc/s Amateur Radio band is a drawback, but works well on the lower frequencies.
Note: in the photo., the S-meter (top half of front panel)is not standard, whereas the meter (black dial) featured in the lower section is, and monitors various voltages within the set.
In my experience, this set is none too common in enthusiasts' collections, which is a little strange, since Marconi manufactured these sets in large quantities. The handbook for these sets is extremely rare.
member - Saturday, December 10, 2011 at 17:28:16
From G.E.C,: model BRT 400.
Another classically-designed single-conversion s/het. from the 1960's.
Amongst other applications, was used by the BBC Monitoring Service.
When you've operated one of these, you soon discover quality in a comms. receiver. The tuning is almost as smooth as a traditional Eddystone and the freq. stability is very good (at least, mine is!).
Reasonably common in the circles of enthusiasts of classic comms. receivers.
member - Saturday, December 10, 2011 at 17:13:22
Model B40 from Murphy Radio.
Although a conventional design single-conversion s/het., it features some novel features for which Murphy Radio were well-known.
Used by the Royal Navy, certainly up to the 1970's, possibly longer.
Big ~ and extremely heavy! I have been told by a friend who was in the R.N. as a Communications Technician that the weight was 'useful' to maintain freq. stability when a substantial broadside was fired from the parent destroyer! Whether this 'feature' was intrinsic in the design or not is, I feel, open to some debate. :wink:
Has the general attribute as being the R.N.'s replacement for the B28 (a.k.a. the CR.100).
Fairly common in enthusiasts' collections.