Comments for Geekshed - M1BXF

Comment on Icom IC-910H IF Output Modification by Paul

Paul — Tue, 19 Mar 2013 16:10:00 +0000

Hi Gavin,

I have read your your work regarding the IF output modification of the 910H rig. Nice work btw. I’m interested on connecting the Icom 910H with the SDR-IQ for LEO satellite communication, especially with university cubesats.

I have a question regarding the first version of your modification. You stated that tapping the IF before the BPF (FI151, main band), the sensitivity of the 910H radio is reduced due to impedance missmatch. To what extent, the sensitivity of the Icom receiver was reduced compared with the second version of your modification (IF tapping after the filter)? Did you made some comparable experimental tests to observe the difference between the 2 solutions?? Is it that bad, using the first solution?

Looking forward to hearing from you…

Comment on Adding 70MHz (4m) Allocation To Flex PowerSDR by Tony _ G3OVH

Tony _ G3OVH — Sun, 10 Mar 2013 00:05:22 +0000

DId you get it to transmit with this – I added a similar 4m section on my system driving a UHFSDR using Christos’s PowerSDR V2.4.4 for home made rigs version, but I havnt worked out how to get it to transmit. Something is inhibiting Tx with an error message such as “The frequency 70.200000MHz in combination with your TX filter settings [200,3100] are not within the Band specifications for your region (0).”

Comment on SmallWonder Labs PSK-20 Mod to 20m WSPR by m1bxf

m1bxf — Sat, 09 Feb 2013 23:47:11 +0000

Hi, your idea of a daughter board for allowing switching between WSPR and PSK frequencies should work. L2,L5,L6 did not need adjusting after the modification.

Let me know how you get on.

Comment on SmallWonder Labs PSK-20 Mod to 20m WSPR by ZVI AMIT 4X4OQ

ZVI AMIT 4X4OQ — Sun, 07 Oct 2012 05:58:09 +0000

GOOD MORNING GAVIN , PLEASE GIVE ME A INFO.I WISH TO ADAPT MY PSK 20 TRX TO WSPR. BUD NOT PEMANENTLY.( I WOULD LIKE TO WORK ALSO IN PSK AND WSPR) SO I BUILD TWO SMALL BOARDS WITH A C/O RELAY TO ADAPT THE 10 MHZ CRISTALS AND ANOTHER BOARDS FOR THE OSCILATOR CRISTALS.BEFORE I MAKE THIS ADAPTORS THE INFO I NEED IS IF THE SLUG TUNED COILS L2,L5,L6 ARE ENOGH BROAD ORE THEY HAVE TO BE RETUNED.THIS INFO IS CRITICAL FOR ME BEFORE I MAKE ALL THE ADAPTER BOARDS.THANCKS A LOT,ZVI 4X4OQ ZVIAMIT11@BEZEQINT.NET

Comment on Yaesu’s Quadra VL-1000 Will do 70MHz by John

John — Mon, 11 Jun 2012 07:40:17 +0000

Hello,

thank you for this very interesting finding. I wonder which output filter the QUADRA is using for 70MHz (the 50MHz one ?). If “YES” can this filter be optimzed for 70MHz (I think – like you mentioned- that this is the main reason for only 35% efficency)

In DL 70Mhz is not allowed (I hope YET)..I have built a transceiver for “beeing prpared” an listen in 4m openings….I also have prpared the elemnts to add to my 3ele SteppIR for building a 5 ele 70MHz yagi out of it.

73 de John, DL5RDI

Comment on PICAXE-28X1 BXF Shack Controller (SO3R / SOMR) by m1bxf

m1bxf — Mon, 21 May 2012 12:47:26 +0000

Hi Keith,

I did reply direct to you a while back on this, I’ll try and dig out my email for you. For now I’ve fixed the broken URL to the PCB file. I’ve none available due to the cost of making small quantities, but it’s not too hard to make your own, although it is double sided a bit more care is needed than usual.

There is still the ongoing updated version being created by David M0GUM but nothing is complete or published yet, I’ll get an updated status as his design was intended to become a kit.

Look forward to hearing you again on VHF!

Comment on PICAXE-28X1 BXF Shack Controller (SO3R / SOMR) by Keith

Keith — Sat, 19 May 2012 21:11:12 +0000

Hi Gavin

Your ExpressPCB v1.4 PCB Layout link is not working I am still looking to build a copy so your PCB layout would be useful or are PCB’s available.

Is your 4m amp control unit info available or was it a commercial unit?

73 Keith GU6EFB

PS now the rig has been repaired should be able to work you again in the contest

Comment on BXF Azimuth Rotator Controller by Slavek (OK2SLC)

Slavek (OK2SLC) — Fri, 18 May 2012 06:51:56 +0000

appendix,
For me this controller working only when at inputs are logical levels L (no pressed push-button – NC).

(sorry, my English is not good

Slavek, OK2SLC

Comment on BXF Azimuth Rotator Controller by Slavek (OK2SLC)

Slavek (OK2SLC) — Thu, 17 May 2012 09:22:38 +0000

Hallo Gav,
hmm, but me it working only with pull down resistors (the switches are connected to +5V when pressed) because after power ON logical state H starting non-stop calibration proces. I have something wrong?

Slavek, OK2SLC

Comment on BXF Azimuth Rotator Controller by m1bxf

m1bxf — Thu, 17 May 2012 08:06:31 +0000

Hello Slavek,

Thanks for the comments. R7-9 are pull-up (to 5v) as the switches are connected to Ground when pressed.