Differences

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--- radios:ft-857d [2023/04/15 17:03] – [Technical fixes] m0lte
+++ radios:ft-857d [2023/04/15 17:49] (current) – [RF out] m0lte
@@ Line 1: / Line 1: @@
 ====== Yaesu FT-857D ======
-A 160m to 70cm, all mode, portable, 100W radio without a tuner.
+A 160m to 70cm, all mode, portable, 100W radio without a tuner. Great for high-ish power portable paired with a fairly chunky battery, and resonant antennas.
-===== Technical fixes =====
+===== Technical =====
+==== RF out ====
+It is fairly straightforward to add an SDR output to this radio, with an inexpensive [[https://www.sdr-kits.net/index.php?route=product/product&product_id=162|HupRF Panoramic Adapter Tap (PATV)]] Board or similar, which is just a small buffer amplifier. Using this board you can directly connect something like an SDRplay RSP and watch whole bands at a time, including setting up click-to-tune etc.
+==== Filter failure ====
 The FT-857D has an issue where ceramic filters go bad and the receiver fills with crashes, even with no antenna connected. Apparently this is due to a design error. If yours hasn't failed yet, prevention is possible, see {{ :radios:ft857-897_cf1005-fix.pdf |}}. Apart from the symptom, a Yaesu technician reports that if your filters have a "dusty" or "hazy" appearance, it is likely they have failed / will fail soon.
@@ Line 16: / Line 22: @@
 The components I have been supplied are marked CFWM 455E, LTM 455GW, LTM455HW.
+From Technofix:
+x LTM455H 455kHz IF ceramic filter\\
+Replaces LTM455HW, CFWM455H, ALFYM455H\\
+kHz 6dB bandwidth, commonly used for AM
+x LTM455E 455kHz IF ceramic filter\\
+Replaces LTM455EW, CFWM455E, ALFYM455E\\
+kHz 6dB bandwidth, commonly used for FM(W)
+x LTM455G 455kHz IF ceramic filter\\
+Replaces LTM455GW, CFWM455G, ALFYM455G\\
+kHz 6dB bandwidth, commonly used for FM(N)
+For me, CFWM 455E is CF2, LTM 455GW is CF3, and LTM 455HW is CF5.