[Premium-Rx] 590H Filters?

[eugene at hertzmail.com]

----Sorry if you've seen this email before-I never saw it go through and its possible it was during the time that QTH was being transitioned.----
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In a 590, A14S2 has 32 combinations of switch positions. These 32 possible combinations indicate which filter is locate in which filter slot  on the A4 IF filter board.

The question is whether the 590H reads this switch or not. 

I guess I'm hoping someone has some first hand experience or knowledge about this

Thanks!
Eugene


-----Original Message-----
From: Claus Hanke [mailto:claushanke at yahoo.com] 
Sent: Sunday, January 04, 2009 7:54 PM
To: ToddRoberts2001 at aol.com; eugene at hertzmail.com
Subject: Re: [Premium-Rx] 590H Filters?

Hi Eugene/Todd,
to my knowledge the 590H stands for hopping and it is basically a 590, but uses the VCO/Synthesizer board from the RF-350K transceiver. So just exchanging the EPROMs with the ones from a 590 won't work.
Hope that helped a bit.
73, Claus


----- Original Message ----
From: "ToddRoberts2001 at aol.com" <ToddRoberts2001 at aol.com>
To: premium-rx at mailman.qth.net
Sent: Sunday, January 4, 2009 4:21:46 PM
Subject: Re: [Premium-Rx] 590H Filters?

In a message dated 1/4/2009 6:42:34 P.M. Eastern Standard Time, eugene at hertzmail.com writes:

"In the standard receiver, bandwidth values displayed on the front  panel are selected on the A14 Assembly with DIP switch S2.  This switch  is not used in the enhanced model ("H" model). Bandwidth values are fixed  (not
selectable) in the 590H Receiver, and are displayed for each  selected demodulation modes as follows:
usb,lsb,isb - 3.2kHz
am -  6.0kHz
fm - 16.0 kHz
cw - 0.3kHz

I have always wanted to get more  filter choices in this radio _____________________________________________________________

Hi Eugene,
I'm sure others know more about this but I would guess the filter choices may be locked in by the factory programming of the eprom set and may not be changeable except by installing another set of eproms with more filter choices.

I know someone who made up his own IF board for an RF-590 and used small 5V reed-relay switches to switch both the input and output sides of the filters. He was able to improve the ultimate rejection (blowby) around the filters by using reed-relay switches instead of the diode switching the factory used.

He manually switched the filters by putting a small rotary switch in the front panel where the squelch control was located. 
This way he could use any filter in any mode and not be locked into a single bandwidth choice for each mode. For example he could switch in any filter choice in the AM or CW mode. He could also  use different sizes and types of filters by making up his own IF board. 
He could always restore the receiver back to original if wanted by re-installing the original IF board, removing the rotary switch and putting the squelch control back into place.

This may be more than you are willing to do but thought it may give you some ideas on what is possible with the RF-590 series.

73 - Todd WD4NGG

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