[Yaesu] Pin Diode Replacement in FT1000

[Jan Erik Holm]

Ok, here goes.

Don´t understand why there would be controversy about
this, there is a well known fact that the FT-1000D has
poor IMD2 performance.
This is also coverd in Yaesu technical bulletin TB-93201
dated 8 Feb 1993.

Yaesu did replace D1005, D1006 with DIN60-4070

D1007,1012, 1014,1016, 1018, 1020, 1022, 1024, 1026
1028,1030, 1032, 1034, 1036, 1038 and 1064 with 1SV157

Since I didn´t have those diodes I replaced ALL with
BF379. Result was perfect. Now good second order IMD
performance.
There are also other PIN diodes that can be used for
this application, forexample BF479. Also BA595, BA885
and BA895 can be used but they are SMD´s and might
be tricy to use in that application.

73 good luck / Jim SM2EKM
-----------------------------------------------------------


Anthony Tedes wrote:
> Sorry I wasn't clear. Referring to the D model.
> 
> 73, Tony VE3XC
> 
> ----- Original Message ----- 
> From: "Jan Erik Holm" <sm2ekm at telia.com>
> To: "Anthony Tedes" <actedes at sympatico.ca>
> Sent: Tuesday, February 08, 2005 10:43 AM
> Subject: Re: [Yaesu] Pin Diode Replacement in FT1000
> 
> 
> 
>>What FT-1000 are you talking about? D or MP?
>>
>>73 Jim SM2EKM
>>--------------------
>>
>>Anthony Tedes wrote:
>>
>>
>>>Does somebody out there have experience replacing Yaesu front end diodes
> 
> with pin diodes to improve IMD? Which diodes were used? and where? and how
> did you measure your results? I have seen a lot of controversy about this.
> Yaesu issued a Tech bulletin for the 1000MP yet some argue it does nothing
> and is a waste of time and money. I have neither to waste.
> 
>>>Thanks guys
>>>
>>>Tony VE3XC