The Marconi HR110 Receiver

 

 I don't know much about this receiver except it reminds me of my old war-time R206 with its drum dial.

It was almost certainly made for marine use and covers the following bands...

0.5-1.45MHz; 1.45-4MHz; 4-11.8MHz; 11.8-19MHz and 19-30MHz

I suspect the set is a double superhet with IFs of 3.1MHz and 465KHz?

Tuning arrangements include a 5" logging dial with a 0-20 counter similar in operation to that in the HRO. This type of tuning dial is used more for noting and returning to a spot on the dial rather than measuring the frequency. Its small size belies its weight which must be around 70lbs.

In line with my general site update to improve pictures of the radios I removed it from its place on a sagging shelf to photograph its innards.

First a view of the back of the receiver case

 

 Next a view of the rear of the power supply case.

 

 By slackening the two large screws the PSU can be removed.. not much room in here.

 

 The pictures show the mains transformer tapped for all common mains voltages and a pair of chokes.

 

 The front panel can be detached with the receiver still in its case

At this point you can see that the dial looks home-made maybe because the original became brittle and disintegrated?

The dial is a possible candidate for reconstruction using a computer program and printer? The marking at the upper right knob implies it's a double superhet.

 

 View showing the two sections of the receiver before opening the chassis on its hinges.

 

 Rear view of rear chassis. I counted 19 valves located front and back plus some B7G crystals.

 

 Top view of the pair of chassis still bolted together. A bit grubby...

 

 View showing the two chassis hinged apart

 

 Front chassis

 

 Rear chassis

 

 View showing the hinge

 

 The receiver is clearly well thought out mechanically and should prove to be easy to service.

Its weight makes it a daunting job and it's total of at least 21 valves must make it relatively complex proposition.

From the markings on the chassis someone has been here before but its grubbiness and light surface corrosion makes me think it was many decades ago.

Return to Communications Receivers