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Messages - 26AM081

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1
Antenna Discussion Board / Re: Wire antenna's
« on: March 08, 2022, 08:34:54 am »
Hi Matthew, personally I've not experimented with such antenna on any band. To me the Double Bazooka is basicaly a dipole,whether that be in the vertical or horizontal plan but with coax as the driven elements in a DC shorted configuration.

I guess these shares some similarities to a Folded Dipole, but could possible be regarded as a Stub Match configuration.

I'm sure others will post advice soon, but I need to read-up on these types of antenna's, and possible try one out. But I would say it probably has a wider bandwidth compaired to a traditional dipole.

Regarding the Zepp to me that is another name for a J-pole antenna, but I could be wrong. But J-poles and it's bigger brother the Slim Jim are good antenna's which I have used numerious times. I would say the TXis  better than RX, but that may have also been conditions at the time.

I'm curious to the troubles you've been having with verticals.

73's Bill





2
Members Introductions & (Callsign Requests) / Re: Call sign request
« on: March 04, 2022, 08:05:47 am »
Hi Matthew and welcome to AMDX Group. Your receive your call sign very soon.

73's

DE Bill 26AM081

3
Antenna Discussion Board / V2000 Tri-Bander.
« on: February 27, 2022, 10:05:54 am »
Installed the new V2000 antenna yesterday. Working a treat on 6m, 2m and 70cms. Still need to tweek the S.W.R. for 6m, but very happy so far with it's performance.

412-0

The tip of the antenna is peaking just over 220 feet ASL.

4
DX Reports & Contacts / 2mtrs is great!
« on: February 19, 2022, 02:14:15 pm »
Just worked a station from my QTH to Chelmsford using only QRP power. R5-S9 each way. Distance was just over 30 miles away

Mode: FM Simplex
Frequency: 145.475
Power: 5 Watts
Antenna: Sharmon X510

New Yaesu FT-736R is working a treat.  ;)

5
Transceiver Discussion Board / Yaesu FT-736R
« on: February 17, 2022, 04:28:50 pm »
Another classic old Yaesu from around 1994. The FT736R is technically a Quad Bander covering 6m, 2m, 70cms and 23cms, however 6m and 23cms are optional add-ins.

This particular 736R I have has the optional 6m module installed.

It's in a very nice condition for its age, but it could do with a service for peek performance.

408-0

6
Radio Software / Sorcerer Decoder (STANAG FSK PSK CW)
« on: February 05, 2022, 12:38:16 pm »
Sorcerer Decoder is free and simple to use application for windows operating system.

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Download Link: * sorcerer-v1.0.1.zip (943.81 kB - downloaded 36 times.)

The software is capable of decoding many modes including

DPRK 600 bd FSK* EFR Telemeter
Facsimile (FAX) 60-90-120-240 LPM
Facsimile (FAX) B&W – Gray Scale
France-Inter Time Signal
Globe Wireless Dataplex Marker
Globe Wireless FSK & PSK
G-Tor ARQ G-Tor FEC
Greek 145bd 1265 Hz FSK*
Grintek DT-309
Harris RF-3560 PSTN TIU
Hart PRIME
Hellschreiber – Basic Hellschreiber – FELD
Hellschreiber – FM Hellschreiber- MT
Hellschreiber- Duplo Hellschreiber – PSK
HF Datalink (HFDL) ARINC 635
IRA-ARQ (ASCII-ARQ)
Israeli Tadiran Burst Message System*
Italian FSK Burst 600 bps*
Italian FSK 300/600 bd*
Italian FSK 1200 bd*
IRA-ARQ (includes Zip archive recovery)
MD-513B 16PSK MT63
MD-674 Asynchronous FSK
MD-1061 16PSK MD-1239 16PSK
MD-1268 16PSK MFSK8 & 16
Mil-Std 188-110A App A 16DPSK
Mil-Std 188-110A serial
Mil-Std 188-110A serial HRS variant
Mil-Std 55529A NB Asynchronous FSK
Mil-Std 55529A WB Asynchronous FSK
MSF Rugby Time Signal
Nokia M85200 M90*
OLIVIA (all submodes)

7
Radio Software / Yaesu FTM-300D Programming Software
« on: January 25, 2022, 06:20:30 pm »
Here's the programming software for the Yaesu FTM-300D. I've only had a quick play with it, so not had chance to fully understand it.

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Download Link https://www.yaesu.com/downloadFile.cfm?FileID=16512&FileCatID=42&FileName=FTM-300D_ADMS-12_ENG.zip&FileContentType=application%2Fx-zip-compressed

8
Radio Software / DUDE-Star
« on: January 23, 2022, 09:11:15 am »
Want to try Digi Voice modes like DMR, YSF, P25, D-Star etc.  Well it's Super easy with Dude-Star.

NO Radio Needed.
NO Hotspot Needed.

399-0

Download Links for 32 & 64 Bit Microsoft Windows Platforms.

* dudestar_x86.zip (9841.66 kB - downloaded 194 times.)
* dudestar_x64.zip (11894.53 kB - downloaded 499 times.)

9
Antenna Discussion Board / The LPAM Medium Wave Antenna
« on: January 13, 2022, 10:27:32 pm »
Here's a basic design for building a 30FT / 10 Meter LPAM Medium Wave Antenna.

This antenna is basically comprised of a vertical radiating element which at it's base is a loading coil to overcome the reduced length of the radiating element. At higher frequencies this coil is usually not all that large in inductance.

In essense the antenna is basically just an end fed 1mm core wire strapped to a telescopic fiber glass pole. You could also use aluminum tube sections put together at a maximum height of 32 feet. Note this can also help reduce the required inductance of the loading coil as you increase the diameter of the radiating element.

It's important to note that ground radials are required too. These can be omitted, but performance is drastically reduced if you do choose not to use them. Even if you have more radials at shorter lengths is better than less at longer lengths.

Here's an example of the vertical monopole with ground radials.
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These antennas are usually regarding as being called a "Compromise Antenna", however this type of design is very close to the commercially availble antennas used for Long Term RSL / LPAM Radio stations all over the UK. The only difference is the lack of a "Top Hat" or "Capacitive Hat" section. These are used to help reduce the loading inductance and can also help move the radiating lobe higher up the driven element to overcome trees / nearby objects and buildings etc.

Example of loading coil
392-1

You can further reduced the loading coil size by either, increasing the diameter or the radiating element, or adding a capacitive hat at the top. If you do decided to use this type of antenna which is very similar to the commercial type available, all-be-it minus the capacitive hat. The loading inductance @ the lower end of the band will be very large.

UK LPAM Frequencies


Dutch Pirate Frequencies



10
HomeBrew / LPAM MF Top Band Transmitter
« on: December 18, 2021, 10:05:21 am »
Here's one of my later Lock Down Projects, a MF Top Band AM Transmitter with 1W PEP. I must state that I did not develop the board that's inside the TX, this was purchased from a seller I found on eBay. I spent some weeks putting it under test before I decided it deserved to be boxed.

Not much technical data was given with the transmitter, apart from it's frequency generation method (DDS) and the output power. It lacked any circuit description and the method of modulation, but I would guess it's just the DDS module feeding a series mod buffer into the final PA stage. No output filtering is included, but checking for harmonics, I found they are very very low, about -60dBm from the fundermental.

382-0

Below showing a photo of the project box I decided to use. This wasn't all that expensive and gives a very nice semi-professional look.

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The project box was first fitted with a ground chassis plate to mount the TX PCB too. Luckily the way the project box was designed allowed for this to be easily implemented. Then came the next job of cutting out the holes for the three sockects on the rear back panel.

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I decided on N Type socket for the RF output, a 2Pin Aviation plug for the power, and XLR for the audio as used on professional broadcast equipment. At this point being photographed the front panel has yet to be populated with the LCD, Rotary Encoder, Key Lock, Fuse holder and Power Switch. The PCB only included the LCD and Rotary encoder, the other items I added for either extra functions / sercurity and protection.

388-3


12
Wanted / Re: President Jackson 1 Mk1
« on: December 04, 2021, 04:46:43 pm »
Managed to find one, Thank you to Jonny66 for selling me his. Works really well and very pleased with it

360-0

13
New web-based RSGB EMF calculator

The RSGB has launched a new version of the Society’s EMF calculator v11d which is now available in a new browser-based version as well as the spreadsheet version.

The web browser version does not require you to have Excel or another spreadsheet on your computer. It also has several great new features to make compliance checking simpler and quicker.…

See more
https://rsgb.services/public/software/emccalculator/?fbclid=IwAR04rgt_34Y1pMH6kHAwy8MWIB7ALDk-5qETUrJWMxYPqyDMCAm9-EUHIRQ

14
FreeBanding / Atomix Pirate Station in Kent SE-UK
« on: November 29, 2021, 10:56:21 pm »
Scanning the band up at Bluebell Hill a 2 weeks ago, and came across Atomic FM on 87.6Mhz

They have RDS (scrolling) but not Stereo encoded signal.

Don't think it lasted very long as they have now gone of air.

https://youtu.be/VSWgj9VRNxw

15
Radio Software / Baofeng BF-888s Programming Software
« on: November 29, 2021, 10:37:08 pm »
This may be useful for anyone looking to program the BF-888s radios. I'm not sure if Chirp has added these radios to it's support list at the time of writing this post, but here it is just incase.

357-0

Download Link: * BF-888S_v1.05.zip (937.1 kB - downloaded 30 times.)

I've also used this same software client for programming Kenwood UHF radios like the TK-3107

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