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The HW-101
80...10 meter Ham
Band Transceiver came on the market in 1970 and was produced until
1983. It
was the successor of the HW-100
that came on the market in
1968. The two transceiver models are very similar but the HW-101
is somewhat improved over
the HW-100.
On the HW-101 the Heath Company replaced the dialing
mechanism that had caused so many complaints on the HW-100
and they also prepared it for a CW-filter to be mounted already from
start. The HW-101
is the most
successful Heathkit
transceiver ever, in
production numbers. More than 40 000 units were produced. The HW-101
was meant to be replaced by the HW-104 in 1975 but the HW-101
survived the HW-104
that was produced only until 1975. The HW-104 was a somewhat simplified
SB-104.
The SB-104
came on the market in 1974 but was replaced in 1977 by the improved SB-104A.
They were all replaced in 1983 by the HW-5400
but it was produced only until 1984.
This is my first HW-101 but I have one more. When I bought this HW-101 it was very smoky and worked only just. The receive sensitivity was poor. I cleaned it from nicotine and tar and did the following modifications: I changed the V10 and V11 tubes from 6HS6 to 6AU6 types to reduce cross modulation. I changed the value of R113 from 1kΩ to 10kΩ. I added a 10MΩ resistor between lug 3 (hot end) of zero adjusting potentiometer and pin 2 of T102 to improve S-meter action. I added a 10kΩ resistor across the primary winding of T103 to further improve the S-meter action and to make strong audio signals cleaner. I replaced the resistor R202 with a jumper wire to increase output gain. I replaced the resistors R107 to a 100kΩ 1W and R106 to a 33kΩ 1W to stop S-meter drift. Finally I did a total re-alignment of the HW-101. Now it is like a whole different receiver. |