We have shipped more than 100 of these custom INRAD filters since 2011
with an overall customer satisfaction record of 96.5%. What's more, since
April 2012, 100% of our customers have reported being pleased with 700 Hz.
In the interest of full disclosure, FYI these statistics don't include
customers who purchased a 700 Hz filter but never used it. We've had four
such customers to date ...
1. Chris P. : who was reluctant to open his factory-built K3, with sub-RX.
2. Mike R. : who reluctantly sold his K3, soon after ordering his filter.
3. Joel C. : an SSB-only op, who ordered one on a whim for digital modes.
4. John Z. : who ultimately purchased a Ten-Tec Omni VI, instead of a K3.
SPECIFICATIONS
Overview
o Center Frequency : 8125 kHz
o Nominal Bandwidth : 700 Hz
o 6/60 Shape Factor : 1.7
o Insertion Loss : 6 dB (note 1)
Typical Passband Response (note 1)
o 0.680 kHz @ -3 dB
o 0.785 kHz @ -6 dB (note 2)
o 1.030 kHz @ -30 dB
o 1.340 kHz @ -60 dB
Center Frequency Deviation
o +/- 100 Hz worst-case, across all manufacturing lots (note 3)
o +/- 5 Hz typical, within any given manufacturing lot (note 4)
Notes:
(1) Data extrapolated from the plot of a randomly selected filter.
(2) According to INRAD, the -6 dB bandwidth can vary by +/- 15 Hz.
(3) To date, the standard deviation of all batch-offsets is 45 Hz.
(4) In contrast, Elecraft considers "within 40 Hz" a matched pair.
Visit http://www.unpcbs.com to order and for: pricing; availability;
delivery status; terms of sale; shipping charges; passband response plot;
user comments; FAQs; app notes; a slideshow presentation illustrating and
comparing INRAD's CW bandwidth choices; and a marketing brochure that has
information not found elsewhere on our website.
73,
Gary (Kilo India Four Golf Golf X-ray)
P.S. In the unlikely event that you aren't delighted with 700 Hz; FYI on
average, these special-order filters retain 95% of their original selling
price on the second-hand market.
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