Golborne Vintage Radio

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Since there is no longer any local AM broadcasts in my neighbourhood and FM is now losing out to DAB+ I thought I should sort out a means to have any of these modern radio technologies (including Internet radio) sent to any of my vintage radios on either AM or FM.

The project worked out quite well so now I can listen to just about any radio station on any of my vintage sets.

It also let me exercise my cabinet making skills which have not been used for a while!

The incomplete back panel has since had the AUX in jack fitted and a socket for the AM aerial...

Cheers,

John
Very nice too. Which transmitters are you using for both AM and FM?

What's the regulatory situation in the US? In the UK we are allowed to use ultra low power FM transmitters that are type approved. AM transmiters are not allowed. In practice there is little enforcement activity. Mostly complaints driven, so if you squat close to a BBC station and use too much power somebody might get unhappy. Be sensible, check your coverage with a portable set and keep out of trouble.

Some years ago "Radio Free Dulwich" used to broadcast our kind of music on AM around the Vintage Wireless Museum. It may still operate though I don't know how often. I somehow dont think it would have generated any complaints. It would have been pretty inconspicuous compared to the usual south London pirates blasting out non-music. Often overmodulated and squatting too close to BBC stations.
Excellent set-up John - very nicely put together. A rather splendid looking radio too!

John isn't in the US Jeffrey, he's in Geneva, Switzerland, and though Switzerland isn't in the EU, it's subject to the same restrictions as to transmitting equipment as we are in the UK, as set out in the EU R&TTE directive and EMC Directive 2004/108/EC, which can be found here: http://ec.europa.eu/enterprise/sectors/r...-20_en.pdf

The geographic scope of the Directives is outlined in 1.1.1:

Quote:

1.1.1 Geographic scope:

The Directive applies throughout the European Union, that is to say in all Member States of the European Union. It is also applied in non-member countries if there is a relevant agreement. For example, it applies to the Contracting States of the European Economic Area (EEA), that is to say, the 27 Member States of the EU plus Iceland, Liechtenstein and Norway. In accordance with aMutual Recognition Agreement between Switzerland and the EU, the Directive is transposed in Switzerland. It applies in Turkey pursuant to the EU-Turkey Customs Union.

End quote.

There are certain LPDs - 'low power devices' on the market, which conform to the regulations and are CE approved to enable such things as MP3 players to be played through 'in-car-entertainment' systems (ICE) – car radios in other words, but nothing that I'm aware of which can be legally used for short-range transmission on any mode, including FM and AM. (There are scores of legal LPDs of course - car key fobs, remote control garage door openers, wireless door bells, room thermostats, baby alarms, and so on).

A widely used short-range AM transmitter illegally used in the UK (which, surprisingly perhaps, can be used legally in paranoid America) is known as the ‘Spitfire’. I believe that Ofcom has made half-hearted attempts to stop the sale of them, but from an enforcement perspective, it doesn't keep OFCOM awake at night - it's just not on their radar. As Jeffrey says, London and most cities in the UK have several illegal pirate radio broadcast stations which OFCOM are forever trying to shut down.

One UK supplier has found a novel way to sell these 'Spitfire' units by shifting the onus onto the purchaser by making the purchase of them subject to the following terms:

Quote:

EU R&TTE directive and EMC Directive 2004/108/EC - in order to purchase this item, you must agree that:-

1. You intend to export the item to an address outside the European Union. Under no circumstances will this item be resold or put into service within the European Union.
or
2. The item will only be used within a completely RF screened and shielded metal enclosure or environment for testing, evaluation, experimental or laboratory purposes and any other use that does not radiate electro-magnetic waves into free space. I am not an unqualified end user and I have RF engineering and electromagnetic compatibility skills at my disposal.
or
3. For use by a Licensed Radio Amateur on 160M Band

End quote.

http://www.6v6.co.uk/transmitters/spitfi...er-eu.html

Another UK company  - Quasar Electronics - which sells a wide range of low power transmitter kits is rather more strict about it. Here’s an example of a low power 2 transistor FM ‘bug’. As will be noted, if anyone in the UK or wider EU attempts to place an order, it will be cancelled and any money paid will be refunded.

Quote:

This 2-transistor 3V surveillance 'bug' Electronic kit gives exceptionally clear and stable performance given its low price and simplicity. And because it has a lower output power battery life is significantly extended.
• Transmits to 300 metres plus in the open or 50 metres inside buildings with 3V supply
• Can be received on a standard FM radio
• Highly sensitive built-in electret microphone
• User adjustable transmitting frequency (just requires a small screwdriver)
• !! NOT FOR SALE IN THE UK or EU!! Please do not order this item if you live in the UK or EU. The item will be removed from your order and refunded accordingly.

Unquote.

https://www.quasarelectronics.co.uk/Item...ransmitter

My son has a Spitfire - it works very well.

I've built a couple of 'Mini-Mod' home-brew AM micro-transmitters which have a range of just a few feet and work well if placed close to an AM receiver on MW. I've referred to that in another thread.

For all practical purposes, Ofcom's stance is evocative of that quaint term so beloved of the US armed forces in less enlightened times in another context - 'Don't Ask - Don't Tell'. Though I've outlined the regulatory framework, I don't think we need concern ourselves with it, and just do what we need to so that we can enjoy listening to our AM radios, which would otherwise be simple ornamental as fewer and fewer stations are on the AM bands, and as in Geneva, the FM band too is slowly losing out to DAB - only hanging on due to the millions of cars which only have AM/FM radios. It would be disastrous for commercial broadcasters to not be allowed to continue transmitting on FM with so few DAB radios in cars, there would be a hug loss of listeners, and hence, advertising revenue.

Waffled and dribbled Yorkie.
(17-08-2015, 04:22 PM)ppppenguin Wrote: [ -> ]Which transmitters are you using for both AM and FM?

Main use is on AM and for that I'm using the venerable SSTRAN AMT3000 kit.  

The FM one was an ebay purchase so I'll have to go look up the details.   My place is almost like a Faraday cage - something to do with  either the stone or there's tons of rebar in the walls.   For example I've got a industry grade wifi access point installed that claims throughput of up to 1GB and range of 300metres.   When I go the other side of the wall from where it's mounted, the signal drops to less than 10%

I did some range tests in the car and FM reaches to the end of the garden so the only risk is some neighbours on one side of me.  Since I use a blank frequency I'm not likely to interfere with anything.  As I mentioned there are no AM broadcasts here but again the most that would happen is the same neighbours would be impacted as the range is about the same as on FM.

Cheers,  John
 
In the unlikely event that any RF escaped from your 'Faraday cage' and your neighbours found you on the dial John, they might like your choice of music Smile

That's an impressive looking radio - magic eye glowing brightly too!
If I try to click on any of Geaney's Thumbnali pictures to enlarge them, all that happens is a banner which states 'No Deals' appears across them, and they wont enlarge. What is happening here??
(18-08-2015, 08:27 AM)Old Sparky Wrote: [ -> ]If I try to click on any of Geaney's Thumbnali pictures to enlarge them, all that happens is a banner which states 'No Deals' appears across them, and they wont enlarge.  What is happening here??

You have malware on your PC. See your thread about Bing, tr533, Winzip etc. As a good first step download Malwarebytes from here: https://www.malwarebytes.org/mwb-download/ Don't take the trial offer or let it run as your main AV software (2 lots of AV software can fight like ferrets in a sack), just use it for a one-off scan every now and then.
One problem with AM is interference from other, authorised, transmitters, especially at night.

Most contenders for frequencies that were once occupied mainly by one powerful transmitter a long way away are usually occupied by local radio stations these days! Take a look at the list here!

However, 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 - there is a 10kW transmitter in eastern Slovakia, but that shouldn't bother you much!
That's a useful link Terry - I'm amazed at just how many local radio stations are on MW! Click on half a dozen frequencies, and the map soon started to fill up. As well as local radio, we have a local community broadcast TV station here known as 'Estuary TV' covering the north and south banks of the Humber Estuary, on Freeview Channel 7. Some of the progs are actually quite good.

I have my little 'min-mod' micro transmitter tuned to 325 M on MW, and it seems a clear spot.
So, 927kHz, leaving a guard channel between you and the BBC's allocation (909kHz) and then:

 10kW Algeria
 20kW Saudi Arabia
 50kW Greece
 10kW Iran
  1kW Portugal (Inactive)
100kW Turkey

That looks like an excellent choice!

Anything on the intermediate channel of any significance (=>100kW) is in Ethiopia, Slovenia or Syria and on the upper adjacent channel it would be Syria, Morocco or Iran.

Was this excellent choice of channel pure chance or the result of a lot of research?
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