Where and how do i get a down converter from 2.4 to 435 mhz?
KC9MLN Thank You Douglas Anoman
I have a dual-IF Keps.it downconverter and really like it.
http://www.keps.it/en/sat_products/sat_products.html
73, Drew KO4MA
----- Original Message ----- From: "Douglas Anoman" [email protected] To: [email protected] Sent: Sunday, March 22, 2009 7:05 AM Subject: [amsat-bb] down converter
Where and how do i get a down converter from 2.4 to 435 mhz?
KC9MLN Thank You Douglas Anoman
Sent via [email protected]. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
GOMRF produced a kit, back in 1996 (the document says Phase 3D).
I've got one that was never built.
73, doug
From: Douglas Anoman [email protected] Date: Sun, 22 Mar 2009 11:05:11 +0000
Where and how do i get a down converter from 2.4 to 435 mhz?
KC9MLN Thank You Douglas Anoman
KC9MLN asked:
Where and how do i get a down converter from 2.4 to 435 mhz?
Make one. The bits and pieces are all off-the-shelf components and modules. Laura Halliday VE7LDH "Que les nuages soient notreGrid: CN89mg pied a terre..."ICBM: 49 16.05 N 122 56.92 W - Hospital/Shafte
_________________________________________________________________ Clavardez avec tout le groupe et rassemblez-les. http://go.microsoft.com/?linkid=9650742
Or modify one.
I wanted an IF in the 300 mHz range, so that I wouldn't have to worry about interference from either a 2m or 70cm uplink. I'm using an ICOM R-7000 all mode scanner for the IF receiver, so the odd frequency isn't a problem. It was a fairly simple matter to swap crystals on a Drake 2880 and change out one cap, to move the local oscillator to 2100 mHz. That puts our 2401.x mHz downlinks at 301.x You might be able to push it far enough to get to 435. You'd need to get the LO down to 7,679.69 kHz (7.68 mHz), if my calculations are correct.
Greg KO6TH
From: [email protected] To: [email protected] Date: Sun, 22 Mar 2009 15:11:08 -0700 Subject: [amsat-bb] Re: down converter
KC9MLN asked:
Where and how do i get a down converter from 2.4 to 435 mhz?
Make one. The bits and pieces are all off-the-shelf components and modules. Laura Halliday VE7LDH "Que les nuages soient notreGrid: CN89mg pied a terre..."ICBM: 49 16.05 N 122 56.92 W - Hospital/Shafte
_________________________________________________________________ Get quick access to your favorite MSN content with Internet Explorer 8. http://ie8.msn.com/microsoft/internet-explorer-8/en-us/ie8.aspx?ocid=B037MSN...
On 22 Mar 2009 at 16:03, Greg D. wrote:
Or modify one.
I wanted an IF in the 300 mHz range, so that I wouldn't have to worry about interference from either a 2m or 70cm uplink. I'm using an ICOM R-7000 all mode scanner for the IF receiver, so the odd frequency isn't a problem. It was a fairly simple matter to swap crystals on a Drake 2880 and change out one cap, to move the local oscillator to 2100 mHz. That puts our 2401.x mHz downlinks at 301.x You might be able to push it far enough to get to 435. You'd need to get the LO down to
7,679.69 kHz (7.68 mHz), if my calculations are correct.
Greg KO6TH
I'm using a PCR-1000 for the IF receiver tuning 123.xxxMHZ on a AIDC 3733 downconverter and i don't get any interference from even with 50w on a 14 elements cross yagi on 145mhz uplink.
No filtering just the RG-59U plugged into the PCR-1000 and with the AFC button depress you have a nice doppler correction without any bell and whistle.
P.S. I am still struggling with the deep fades more noticeable on the south to north pass on the south portion and on the north to south on the south portion too.If he's spin stabilized there is something blocking the path under some angles.Probably a new Irish Leprechaun playing havoc up there...I'm guessing it is the same one who was on AO-40.
We will have to wait untill the next S downlink session to test our S band gear again. Now it's SSTV pictures time.
"-"
Luc Leblanc VE2DWE Skype VE2DWE www.qsl.net/ve2dwe WAC BASIC CW PHONE SATELLITE
Douglas Anoman wrote:
Where and how do i get a down converter from 2.4 to 435 mhz?
Hi Doug you need to find a CalAmp 130415 MMDS down converter to modify.
With the right crystal they produce an IF at 435 Mhz.
I wrote an article on modification back in 2005 for the local club mag that I'll send you off list detailing the conversion.
regards
Tim
participants (7)
-
Andrew Glasbrenner -
Doug Faunt N6TQS +1-510-655-8604 -
Douglas Anoman -
Greg D. -
laura halliday -
Luc Leblanc -
Tim Tuck