			August 1, 1974
HA-201						Bulletin No:
Walkie Talkie					HA-201-1

			Amplifier Instability

Differences in cable characteristics between suppliers cause some
amplifiers to oscillate. 

The two T/R switch transformers [T1 and T2] should be cut to 17 1/2
inches long.  This dimension will satisfy all 343-15 cables.

Future manuals will instruct the customer to cut to this new length
instead of 20".
-------------------------------------------------------------------------------------------------------------------
			September 25, 1974
HA-201						Bulletin No:
Walkie Talkie					HA-201-2

		        Instability Of The Drake TR-22/HA-201
			         Combination

To correct instability problems that may occur with the TR-22/HA-201
combination, install the following change:

	Change: 

	Connect a 150 ohm resistor [PN 1-66] between the center pin and 
	ground lug at the RF INPUT connector.

	Install this change only in HA-201 Amplifiers used with the TR-22
	Transceivers and only in cases where instability occurs on
specific
	operating frequencies.
-------------------------------------------------------------------------------------------------------------------
			February 14, 1977
HA-201						Bulletin No:
Walkie Talkie					HA-201-3

		             PN 417-803 Identification
						
++++Information not yet available++++
-------------------------------------------------------------------------------------------------------------------
			May 21, 1981
HA-201						Bulletin No:
Walkie Talkie					HA-201-4
		          Manual Correction For Q1

++++Information not yet available++++
--------------------------------------------------------------------------------------------------------------------
Thats everything I hold up to 1989 that covers the HA-201.  Enjoy!
--------------------------------------------------------------------------------------------------------------------
