Topband: Request from FK8CP

[Michael Tope]

----- Original Message ----- 
From: "David Raymond" <daraymond at iowatelecom.net>
To: "Topband" <topband at contesting.com>
Sent: Wednesday, April 04, 2007 8:03 AM
Subject: Topband: Request from FK8CP


>A couple of days ago, I received a QSL card from Remi, FK8CP.  Enclosed 
>with
> the card were two separate full page, single spaced letters requesting 
> help.
> Letter #1 requests technical assistance.  Letter #2 discusses his 
> operating
> habits, needed countries, etc.  The information Remi was conveying is 
> fairly
> extensive but can be boiled down to several key points as follows:
>
> 1.  The amplifier that Remi recently got has developed a problem (he 
> didn't
> specify the problem or the symptoms).  He believes the problems are with 
> two
> faulty PIN diodes, type MA4P4006D.  He is looking to find a pair "at a 
> very
> cheap price (even used but in good order)."

David,

I sent Alpha an email inquiring about the MA4P4006D and they wrote back
and pointed me to the Alpha Radio Products webstore:

http://alpharadioproducts.com/merchant5/merchant.mvc?Screen=CTGY&Store_Code=AS&Category_Code=A87

The email I got from Molly W0MOM wasn't entirely clear on this, but
she implied that the MA4P4006D was the transmit pin diode. These
are listed as P/N DPX-X112 on the website and they go for $125.00
each. The receive pin diodes are listed as P/N DPX-X103 and go for
$12.00 each. Anyone know for sure if the MA4P4006D is the TX
or RX pin diode in the Alpha 87?? Here are some specifications that
I found on the web for the diode:

Part Number = MA4P4006D
Manufacturer Name = Various
Description = General Purpose PIN Diode
Diodes per Package = 1
V(BR) Min.(V)Breakdown Voltage = 600
V(FM) Max.(V) Forward Voltage = 1.0
@I(FM) (A) (Test Condition) = 100m
Ct{Cj} Nom. (F) Junction Cap. = 2.2p
@V(R) (V) (Test Condition) = 100
t(carrier)(S),Carrier Lifetime = 6.0u
@I(F) (A) (Test Condition) = 10m
r(s) Max.(k) Series Resist. = 0.5
@I(F) (A) (Test Condition) = 100m
@f(res) (Hz) (Test Condition) = 100M
Package = Screw
Military = N


Thanks,

Mike W4EF.........................