Lucky wrote:

"Mark S. Holden" wrote in message
...



I'd feel better about the R75 if the factory incorporated the sync mod
into future production.

The standard filter for sideband is narrow for my tastes at 2.1khz. The
Drake is slightly better at 2.3.

Wider filters can give improved fidelity, although if they don't have
steep enough skirts, you won't like them. My Harris RF-550 and AOR 7030+
have 3.2khz filters. They sound beautiful without adjacent channel
problems. Don't know the shape factor on
the Harris filter, but the 7030 one is 1.33. (It's a crystal filter, made
for the Racal 6790/gm)

Icom does sell a 2.8khz filter for $140 and a 3.3khz filter for $160.
It's not practical to change filters on the Drake.

But an R75 with the Kiwa mods and an extra filter will cost more than
Lucky bid on the Harris. The advantage is he could do it in stages.

If I'm dealing with a reputable person, I'm not afraid of used radios.

Hi Mark

Too bad I lost that Harris but $745 total from Esoteria right now is too
much for me. I agree that 2.1 is narrow but I thought there was a 2.4 stock
filter? I got this from the Yahoo R75 newgroup. Is he right or wrong?


Hi

Last I heard, Radio Esoterica was out of stock on 550's.

Being fiscally responsible is a good idea - but the other thing is another 550 will turn up on ebay within a few weeks or months, and it may close for less. I have a friend who bought two and didn't go over $500 on either of them - but he was lucky.
(bad listings, closed when folks are sleeping or in the middle of a holiday weekend, blurry pictures...)

The Universal radio web site indicates the R75 comes with 2.1, 6, and 12khz filters.

http://www.rffun.com/catalog/commrxvr/0175spec.html

I don't know how much room is inside the case of an R75, but the racal filters I added to my 7030+ are for a 455 IF, so that might be an option too. The ones I used were made by Filtronetics, and they're quite good.

snip