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E.F. Johnson  Matchbox  250-23  275 watt
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E.F. Johnson Matchbox 250-23 275 watt

Item condition:Used
Ended:Aug 02, 201015:00:28 PDT
Bid history:
Starting bid:US $49.99

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Shipping:$20.00 UPS Ground
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Service and other details:
Service
Estimated delivery*
Price
UPS Ground
4-9 business days
$20.00
Local Pickup
Free
*The estimated delivery time is based on the seller's handling time, the shipping 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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 See shipping discounts  |  See all shipping details
Estimated delivery within 4-9 business days.
Returns:
3 day money back, buyer pays return shipping | Read return policy details
eBay will cover your purchase price plus original shipping.

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Other item info

Item number:220643943334
Item location:Portage, MI, United States
Ships to:United States
Payments:
Seller assumes all responsibility for this listing.
Last updated on 06:20:08 AM PDT, Jul 27, 2010 View all revisions

Item specifics

Condition:
Used: An item that has been used previously. The item may have some signs of cosmetic wear, but is fully ... Read moreabout the condition
  

THIS ANTENNA TUNER IS CLEAN INSIDE NO FLASHOVERS

OUTSIDE CONDITION  5 OUT OF 10 THERE ARE  EXTRA   HOLES IN TOP , WORKS NORMALLY, NEEDS CABINET  RESTORATION IF YOU WANT A SHOW PIECE.

IF YOU NEED A GOOD PARALLEL RESONANANT NETWORK  " LADDER LINE FED ANTENNAS " THIS IS IT

EF Johnson Viking Matchbox Antenna Tuner (Model 250-23)

  • GENERAL DESCRIPTION (From EF Johnson Instructions 2/58)
    • The Johnson Matchbox is an antenna coupler designed for matching antenna and transmission lin impedances to a 52 ohm impedance within the amateur bands from 3.5 to 30 megacycles. The Matchbox also provides band switching and transfer of the coupler from transmitter to receiver and in addition mutes the receiver and grounds the receiver antenna terminals during transmission.
    • The Matchox is capable of matching the 52 ohm coaxial output of a transmitter into loads ranging from approxiamately 50 ohms to 1200 ohms for balanced lines, and 50 to 2000 ohms for unbalanced lines. Large amounts of reactance can be compensated for by the coupler, the amount depending upon the frequency, line or antenna resistance. The Matchbox, or any coupler, installed at the transmitter end of the transmission line cannot corrrect the standing way on the transmission line. This standing wave is a matter of impedance match between the antenna and the transmission line and may be eliminated in various ways described in antenna and transmission line literature.
    • The coupler circuit consists of a parallel resonant network utilizing an inductor with a coaxialwound coupling link, a dual tuning capacitor, and a dual differential matching capacitor as shown in Figure 1. Impeadance matching for either balanced or unbalanced transmission lines and antennas is accomplished by the front panel controls of the dual capacitors without resorting to the customary coil taps or link adjustments.

Questions and answers about this item

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Seller assumes all responsibility for this listing.

Shipping and handling

Item location: Portage, MI, United States
Shipping to: United States
 
Shipping and handling
To
Service
Estimated delivery*
US $20.00
United States
UPS Ground
Free Local Pickup
United States
Local Pickup
Local Pickup
You can contact your seller to arrange to pay for and pick up your item.
*The estimated delivery time - opens in a new window or tab is based on the seller's handling time, the shipping service selected, and when the seller receives cleared payment - opens in a new window or tab. Sellers are not responsible for shipping service transit times. Transit times may vary, particularly during peak periods.
Domestic handling time
Will usually ship within 3 business days of receiving cleared payment - opens in a new window or tab.

Return policy

Item must be returned within
Refund will be given as
Return policy details
3 days after the buyer receives it
Money Back
The buyer is responsible for return shipping costs.

Payment details

Payment methodPreferred / Accepted 
Credit or debit card through PayPal
Accepted
 

Seller's payment instructions

USA ONLY