Golborne Vintage Radio

Thanks for reading my post and for your comments Terry.

Ian Liston Smith ( G4JQT), designer of the Mini-Mod, had pointed out in his BVWS Bulletin article that it's best to steer clear of 930 kHz - the second harmonic of 465 kHz which could cause a nasty heterodyne.  

The Mini-Mod will tune from about 900kHz - 1,600 kHz (330 - 187M). I had the two cores of the inductors towards the top and it came out on roughly 325M (922.4KHz), so I peaked the cores there and listened on MW to see if there were any stations around at that spot on the dial and there wasn't. I checked a list of stations at the link below,  and saw that there was nothing on that frequency or either side of it on 918 or 927 KHz. It's worked out well in use. I have an Ekco A22 in the lounge and use it with that. I'm pleased with it and it gives a good account of itself for such a simple design.

A list of MW stations - just click on the frequency of interest, and it will list the stations. Useful in finding an empty slot on the dial:

http://www.mwlist.org/mwlist_quick_a...area=1&kHz=927

I used this site to convert Wavelength to Frequency and vice versa:

http://www.unitconversion.org/unit_c...avelength.html

I thought I'd posted a thread on the 'Mini-Mod' on the forum but all I can find is a thread on the PCB, so I'll post something about it, which might be of interest.

David, your links have been truncated somehow and don't work.

Try http://www.mwlist.org/mwlist_quick_and_easy.php?area=1&kHz=927 (which is the site I used) and http://www.unitconversion.org/unit_conve...ength.html for the conversion.

Mind you, I find it is much simpler to work it out myself! Divide the known quantity into the speed of light (300,000,000m/s) although, as you usually have a good idea of the approximate result, just divide into 3 with as many zeros as you need to get a sensible result. In any case, I can open up the Windows calculator and get the answer faster than fiddling about selecting input and output parameters on a web page!

Good point about 930kHz - the same applies to 940kHz (2 x 470kHz) as well. I don't think anyone would have trouble with the US 455kHz option because it's been causing interference with reception of BBC stations on 908/9kHz since the earl 60s!

Thanks for spotting that Terry - don't know how it happened - these  are what should have been posted, which are as you've stated:

http://www.mwlist.org/mwlist_quick_and_easy.php?area=1&kHz=927


http://www.unitconversion.org/unit_conve...ength.html


Thanks too for the mental arithmetic conversion 'ready reckoner' tip.

I decided to go for a sort of antique dark brown for the front panel - akin to what is used on my Radialva sets.  I added a logo to fill the empty space in the middle.   I figured an art deco style font would be nice.   The ref to Zone1242 as many of you know is my YouTube channel name.

I think it looks at least a bit less like a piece of workshop gear now and will look 'appropriate' sitting on top of my Tonfunk console in the sitting room.

I'm pretty happy with the result so far.  It certainly lives up to the original goal of the project.  The ability to select the many stations on internet that stream music from the forties and fifties and listen on my vintage sets is a real joy.

Cheers,

John


 

(18-08-2015, 10:44 AM)Terry Wrote: [ -> ]... with the closedown of the BBC World Service transmitter at Orford Ness, 648kHz should be a nice clear channel throughout the UK and (most of) Europe ...

Another one to add to the list is 747kHz which has been vacated by the Netherlands with 1251kHz and 675kHz to follow.

Athlone (567kHz) has also closed down, I understand ...