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Item: aerial system tuning unit ham radio receivers
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aerial system tuning unit ham radio receivers

Item condition:--
Ended:19 Nov, 200916:53:47 GMT
Bid history:6 bids
Winning bid:£8.75
Postage:£5.00Royal Mail 2nd Class StandardSee more services 

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Price
Royal Mail 2nd Class Standard
8-10 business days
£5.00
*The estimated delivery time is based on the seller's dispatch time, the postal service selected, and the payment method selected. Sellers are not responsible for shipping service transit times. Transit times may vary, particularly during peak periods.

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Estimated delivery within 8-10 business days
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Other item info
Item number:250527835507
Item location:worcester, Worcestershire, United Kingdom
Post to:United Kingdom
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 Description P&P and payments
Item specifics - Specialist Radio Equipment
Product Type: Ham RadiosManufacturer: --
Sub-Type: --Condition: --
Channel Memory: --  
 The essential components to make a homebrew Aerial (system) tuning units, ATU's as they were known.

Such units were an essential requirement for serious listeners in the hay day of radio listening. They enabled the operator to  maximise  signal  transfer from  an aerial to a receiver by placing a tunable L/C (inductance/capacitance) network between the aerial and receiver which could be peaked to the received frequency. The peak was easily determined by ear or signal strength meter. This should not be confused with the modern, so called, "magnetic balum", which is a fixed "high to low" transformer which attempts to match the high impedance of a long wire to the low impeadence input of a modern receiver, or coax if you are trying to avoid electrical noise, to maximise signal transfere. Of course, a single transformer that could accurate match from LF to HF was a holy grail which no manufacture found, as far as I am aware. It does however achieve a higher signal transfer than would be theoretically achieved without it,  as many users can testify. However , if you are a serious listener, a unit that matches your aerial system to your receiver at the received frequency has obvious advantages; but do bear in mind any improvement depends on the existing efficiency of your present  system.

Two variable capacitors, multiway switch to select coil tappings and the coil. will be supplied with  ATU magazine articles and circuits

A commercially made unit for the SWL is currently advertised in a radio magazine for £149-99; provide a case, some hardware and some time and save a fortune

Please see other radio related items

The item will be posted as soon as possible after payment in so much as the industrial relations problems of the Royal Mail allow. These will also effect delivery times.


Questions and answers about this item
 Q: hi can you tell me the size of the caps as i want to use in tx mode(used to make these out off loo roll tubes and bell wire pi tank?)
A: good morning Receiver two gang variable capacitors, each gang 150pf 'ish (parallel for 300pf) switch 16 way, coil 1 3/8 diam x 6 inch wound length regards
10 Nov, 2009 


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Item location: worcester, Worcestershire, United Kingdom
Dispatches to: United Kingdom
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Estimated delivery*
£5.00
United Kingdom
Royal Mail 2nd Class Standard
8-10 business days
after seller receives cleared payment
*The estimated delivery time is based on the seller's dispatch time, the postal service selected, and when the seller receives cleared payment. Sellers are not responsible for shipping service transit times. Transit times may vary, particularly during peak periods.
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Will usually dispatch within 5 working days of receiving cleared payment.
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