Product Overview
Archer 272-1301 10.7 MHz Ceramic Filter, Two Pieces Still on the Original Card
Condition
New old stock. Both filters are still inside the factory blister on the original Archer card, Cat. No. 272-1301, with the old Radio Shack price sticker on the front and the printed specification block on the back. The card photographed here is representative of our stock rather than the specific card that will ship. Through the blister the two ceramic bodies are tan-brown, each with three leads; one piece reads E10.7A alongside a red index dot, and the leads of the lower piece show darker grey areas that read as ordinary storage tarnish on a part of this age. The card also states the filters were custom manufactured in Japan for Radio Shack, a division of Tandy Corporation. We have not opened the pack, so nothing here has been metered on our bench.
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Product Overview
This is the Archer 272-1301 pack, two 10.7 MHz three-lead ceramic filters carried on one Radio Shack blister card. The card back identifies the device as SFE10.7MA5-A and explains the job plainly: the filter drops in where an adjustable IF transformer would go, small and fixed-tuned, so there is no coil to peak. Pin assignment printed on the card is 1 output, 2 ground, 3 input, and the published input and output impedance is 330 ohms, which is the figure that decides whether it drops straight into an existing FM or scanner IF strip. Search this part by either number: 272-1301 is the Archer catalog number on the front, SFE10.7MA5-A is the device number printed on the back.
Key Features
- Device number printed on the card: SFE10.7MA5-A, Archer catalog number 272-1301
- Center frequency: 10.700 MHz plus or minus 30 kHz (published on the card)
- 3 dB bandwidth: 280 plus or minus 50 kHz (published on the card)
- 20 dB bandwidth: 650 kHz maximum (published on the card)
- Insertion loss: 6 dB maximum; ripple 1.0 dB maximum (published on the card)
- Spurious response, 8 to 12 MHz: 30 dB minimum (published on the card)
- Input and output impedance: 330 ohms (published on the card)
- Three-lead through-hole ceramic body, pin 1 output, pin 2 ground, pin 3 input
- Fixed-tuned replacement for an adjustable IF transformer, no alignment coil to peak
- Two pieces per card, unopened factory blister, custom manufactured in Japan for Radio Shack
Applications
- Radio restorer rebuilding the 10.7 MHz IF strip of a vintage FM receiver and wanting a fixed-tuned part instead of another drifting can
- Scanner and two-way hobbyist replacing a failed IF filter in a crystal-era handheld or base unit
- Homebrew builder laying out an FM front end who needs a known 330 ohm filter to design the matching around
- Electronics instructor demonstrating IF selectivity on a bench receiver without spending a class period aligning transformers
Frequently Asked Questions
Is 272-1301 the same thing as SFE10.7MA5-A?
They are the two numbers for the same pack. 272-1301 is the Archer catalog number printed on the front of the card, and SFE10.7MA5-A is the device number printed on the back with the specification block. If you are cross-referencing a repair manual, either number should land you here.
How many filters do I get, and how do they arrive?
Two filters on one Archer card, which is how the pack was sold and how it is photographed here. The card ships with its factory blister unopened; the card in these photos is a representative example of our stock rather than the exact one that will be picked for your order.
Which lead is input and which is output?
The card prints the pin assignment as 1 output, 2 ground, 3 input, and the drawing on the back shows the index mark at the corner. That is the manufacturer's published assignment rather than something we verified on a bench, so confirm the orientation against your board before you solder.
Do the published specs mean these were measured?
No. Every figure above is copied from the specification block printed on the back of the card. Treat them as the manufacturer's published data and verify against your own alignment if your design has tight margins.
What condition are these really in, and what am I taking on?
You are getting new old stock: an unopened Archer card carrying two ceramic filters in their original blister, decades on a shelf, never installed. The card in these photos is representative of our stock, not a promise of the exact card that ships. What you take on is that we have not opened the pack to sweep them, and the tarnish visible on one piece's leads in the photos is age rather than use, so plan on cleaning the leads before soldering. The photos are the spec for the photographed card only, and the printed specification block is the manufacturer's word rather than ours. Shipping is $8 flat rate, free once your order passes $28, and orders leave our Idaho warehouse the same or next business day.
Radio Shack's parts wall is long gone, but the 10.7 MHz IF strip it fed is still humming in tuners and scanners on plenty of benches. Two filters, one card, blister never opened - your next alignment picks up where a Tandy store shelf left off.
